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#include <bits/stdc++.h>
using namespace std;
void solve() {
long long a1, a2, a3, a4;
cin >> a1 >> a2 >> a3 >> a4;
string ans = "";
if (a3 == 1 && a4 == 1 && a1 >= 2 && a2 >= 2) {
ans = "4774";
a1 -= 2;
a2 -= 2;
} else if (a3 == a4) {
if (a1 >= a3 + 1 && a2 >= a3) {
for (long long i = 0; i < (a3); ++i) ans += "47";
ans += '4';
a1 -= (a3 + 1);
a2 -= a3;
} else if (a2 >= a3 + 1 && a1 >= a3) {
for (long long i = 0; i < (a3); ++i) ans += "74";
ans += '7';
a2 -= (a3 + 1);
a1 -= a3;
} else
ans += "-1";
} else if (a3 - a4 == 1) {
if (a2 >= a3 && a1 >= a3) {
for (long long i = 0; i < (a3); ++i) ans += "47";
a2 -= a3;
a1 -= a3;
} else
ans += "-1";
} else if (a4 - a3 == 1) {
if (a2 >= a4 && a1 >= a4) {
for (long long i = 0; i < (a4); ++i) ans += "74";
a2 -= a4;
a1 -= a4;
} else
ans += "-1";
} else
ans += "-1";
if (ans == "-1") {
cout << -1;
return;
}
if (ans == "4774") {
string pref = "";
string pref2 = "";
for (long long i = 0; i < (a1); ++i) pref += '4';
for (long long i = 0; i < (a2); ++i) pref2 += '7';
ans = pref + "477" + pref2 + '4';
cout << ans;
} else if (ans[0] == '4') {
string pref = "";
string pref2 = "";
for (long long i = 0; i < (a1); ++i) pref += '4';
for (long long i = 0; i < (a2); ++i) pref2 += '7';
string fin;
if (a3 == a4)
fin = pref + ans.substr(0, (long long)ans.size() - 1) + pref2 + '4';
else
fin = pref + ans + pref2;
cout << fin;
} else if (ans[0] == '7') {
if (ans == "74") {
string pref = "";
string pref2 = "";
for (long long i = 0; i < (a1); ++i) pref += '4';
for (long long i = 0; i < (a2); ++i) pref2 += '7';
string fin = pref2 + ans + pref;
cout << fin;
return;
} else if (a3 == a4) {
string pref = "";
string pref2 = "";
for (long long i = 0; i < (a1); ++i) pref += '4';
for (long long i = 0; i < (a2); ++i) pref2 += '7';
string fin;
fin = '7' + ans.substr(1, (long long)ans.size() - 1) + pref2;
cout << fin;
return;
}
string pref = "";
string pref2 = "";
for (long long i = 0; i < (a1); ++i) pref += '4';
for (long long i = 0; i < (a2); ++i) pref2 += '7';
string fin =
ans[0] + pref + ans.substr(1, (long long)ans.size() - 2) + pref2 + '4';
cout << fin;
}
}
signed main() {
std::ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
long long t;
t = 1;
while (t--) {
solve();
}
return 0;
}
|
#include <bits/stdc++.h>
#pragma comment(linker, "/stack:30000000")
using namespace std;
using namespace std;
long long n, x, m, c, p, k, d, K, Ans, tot, ul, r, g;
long long dp[2][500000];
vector<pair<long long, long long> > X;
long long Pow(long long x, long long y) {
long long ans = 1;
for (; y; y >>= 1, x = (x * x) % 1000000007LL) {
if (y & 1) ans = (ans * x) % 1000000007LL;
}
return ans;
}
int main() {
int a1, a2, a3, a4, occur_4, occur_7;
cin >> a1 >> a2 >> a3 >> a4;
string ans;
if (abs(a3 - a4) <= 1) {
if (a3 == a4) {
if (a1 > a3) {
for (int i = 1; i <= a3; ++i) ans += "47", a1--, a2--;
ans += "4";
a1--;
} else if (a2 > a4) {
for (int i = 1; i <= a3; ++i) ans += "74", a1--, a2--;
ans += "7";
a2--;
} else {
cout << "-1";
return 0;
}
} else if (a3 > a4) {
for (int i = 1; i <= a3; ++i) ans += "47", a1--, a2--;
} else {
for (int i = 1; i <= a4; ++i) ans += "74", a1--, a2--;
}
if (a1 < 0 || a2 < 0) {
cout << "-1";
return 0;
} else {
for (int i = 0; i <= ans.size() - 1; ++i)
if (ans[i] == '4') {
occur_4 = i;
break;
}
string x1, x2;
for (int i = 1; i <= a1; ++i) x1 += "4";
ans.insert(occur_4, x1);
for (int i = ans.size() - 1; i >= 0; i--)
if (ans[i] == '7') {
occur_7 = i;
break;
}
for (int i = 1; i <= a2; ++i) x2 += "7";
ans.insert(occur_7, x2);
cout << ans;
}
} else {
cout << "-1";
}
}
|
#include <bits/stdc++.h>
using namespace std;
bool isPossible(int a1, int a2, int a3, int a4, bool first4) {
if (a3 < 0 || a4 < 0) return false;
if (abs(a3 - a4) > 1) return false;
if (min(a1, a2) < max(a3, a4)) return false;
if (first4) {
if (a1 == 0) return false;
if (a3 == 0) {
return (a2 + a4 == 0);
}
if (a4 > a3) return false;
if (a4 == a3) {
return (a1 >= a3 + 1);
} else {
return true;
}
} else {
if (a2 == 0) return false;
if (a4 == 0) {
return (a1 + a3 == 0);
}
if (a4 < a3) return false;
if (a4 == a3) {
return (a2 >= a3 + 1);
} else {
return true;
}
}
}
char res[3000000];
int main(void) {
int a1, a2, a3, a4;
scanf("%d%d%d%d", &a1, &a2, &a3, &a4);
if (!isPossible(a1, a2, a3, a4, true) && !isPossible(a1, a2, a3, a4, false)) {
printf("-1\n");
return 0;
}
int n = a1 + a2;
for (int i = 0; i < n; i++) {
if (isPossible(a1, a2, a3, ((i != 0 && res[i - 1] == '7')) ? (a4 - 1) : a4,
true)) {
res[i] = '4';
--a1;
if (i != 0 && res[i - 1] == '7') --a4;
} else {
res[i] = '7';
--a2;
if (i != 0 && res[i - 1] == '4') --a3;
}
}
res[n] = 0;
printf("%s\n", res);
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int cnt[4];
char an[2000010];
int main() {
int i, j, k, n;
for (i = 0; i < 4; i++) scanf("%d", &cnt[i]);
if (cnt[2] == cnt[3]) {
if (cnt[0] <= cnt[2] && cnt[1] <= cnt[2])
puts("-1");
else if (cnt[0] < cnt[2] || cnt[1] < cnt[2])
puts("-1");
else if (cnt[0] == cnt[2]) {
for (i = 0; i < cnt[2]; i++) printf("74");
cnt[1] -= cnt[2];
for (i = 0; i < cnt[1]; i++) putchar('7');
} else {
for (i = cnt[2]; i < cnt[0]; i++) putchar('4');
for (i = 1; i < cnt[2]; i++) printf("74");
for (i = cnt[2]; i <= cnt[1]; i++) putchar('7');
putchar('4');
}
} else if (cnt[2] + 1 == cnt[3]) {
if (cnt[0] < cnt[3] || cnt[1] < cnt[3])
puts("-1");
else {
for (i = 0; i < cnt[3]; i++) {
an[i * 2] = '7';
an[i * 2 + 1] = '4';
}
putchar(an[0]);
for (i = cnt[3]; i < cnt[0]; i++) putchar('4');
for (i = 1; i < cnt[3] * 2 - 1; i++) putchar(an[i]);
for (i = cnt[3]; i < cnt[1]; i++) putchar('7');
putchar(an[cnt[3] * 2 - 1]);
}
} else if (cnt[3] + 1 == cnt[2]) {
if (cnt[0] < cnt[2] || cnt[1] < cnt[2])
puts("-1");
else {
for (i = 0; i < cnt[2]; i++) {
an[i * 2] = '4';
an[i * 2 + 1] = '7';
}
putchar(an[0]);
for (i = cnt[2]; i < cnt[0]; i++) putchar('4');
for (i = 1; i < cnt[2] * 2 - 1; i++) putchar(an[i]);
for (i = cnt[2]; i < cnt[1]; i++) putchar('7');
putchar(an[cnt[2] * 2 - 1]);
}
} else
puts("-1");
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a1, a2, a3, a4;
int main() {
scanf("%d%d%d%d", &a1, &a2, &a3, &a4);
if (abs(a3 - a4) > 1) {
printf("-1\n");
return 0;
}
if (a3 != a4) {
if (min(a1, a2) < max(a3, a4)) {
printf("-1\n");
return 0;
}
}
if (a3 == a4) {
if (!(((a1 > a3) && (a2 >= a3)) || ((a1 >= a4) && (a2 > a4)))) {
printf("-1\n");
return 0;
}
}
if (a3 > a4) {
for (int a = 1; a <= a1 - a3; a++) printf("4");
for (int a = 1; a <= a3; a++) printf("47");
for (int a = 1; a <= a2 - a3; a++) printf("7");
printf("\n");
}
if (a3 < a4) {
printf("74");
for (int a = 1; a <= a1 - a4; a++) printf("4");
for (int a = 1; a <= a4 - 2; a++) printf("74");
for (int a = 1; a <= a2 - a4; a++) printf("7");
printf("74");
printf("\n");
}
if (a3 == a4) {
if (a1 == a3) {
for (int a = 1; a <= a4; a++) printf("74");
for (int a = 1; a <= a2 - a4; a++) printf("7");
printf("\n");
} else {
for (int a = 1; a <= a1 - a3 - 1; a++) printf("4");
for (int a = 1; a <= a3; a++) printf("47");
for (int a = 1; a <= a2 - a3; a++) printf("7");
printf("4");
printf("\n");
}
}
return 0;
}
|
#include <bits/stdc++.h>
namespace chtholly {
inline int read() {
int x = 0, f = 1;
char c = getchar();
for (; !isdigit(c); c = getchar()) f ^= c == '-';
for (; isdigit(c); c = getchar()) x = (x << 3) + (x << 1) + (c ^ '0');
return f ? x : -x;
}
template <typename mitsuha>
inline bool read(mitsuha &x) {
x = 0;
int f = 1;
char c = getchar();
for (; !isdigit(c) && ~c; c = getchar()) f ^= c == '-';
if (!~c) return 0;
for (; isdigit(c); c = getchar()) x = (x << 3) + (x << 1) + (c ^ '0');
return x = f ? x : -x, 1;
}
template <typename mitsuha>
inline int write(mitsuha x) {
if (!x) return 0 & putchar(48);
if (x < 0) x = -x, putchar('-');
int bit[20], i, p = 0;
for (; x; x /= 10) bit[++p] = x % 10;
for (i = p; i; --i) putchar(bit[i] + 48);
return 0;
}
inline char fuhao() {
char c = getchar();
for (; isspace(c); c = getchar())
;
return c;
}
} // namespace chtholly
using namespace chtholly;
using namespace std;
int main() {
int a1, a2, a3, a4;
cin >> a1 >> a2 >> a3 >> a4;
if (abs(a3 - a4) > 1) return puts("-1"), 0;
string llx;
if (a3 > a4) {
a1 -= a3, a2 -= a3;
for (; a3--;) llx += "47";
} else if (a4 > a3) {
a1 -= a4, a2 -= a4;
for (; a4--;) llx += "74";
} else {
a1 -= a3, a2 -= a3;
for (; a3--;) llx += "47";
if (a1 > 0)
--a1, llx += "4";
else
--a2, llx = "7" + llx;
}
if (a1 < 0 || a2 < 0) return puts("-1"), 0;
putchar(llx[0]);
for (; a1--;) putchar('4');
for (int i = 1; i < llx.size() - 1; ++i) putchar(llx[i]);
for (; a2--;) putchar('7');
putchar(llx.back());
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int c4, c7, c47, c74;
scanf("%d%d%d%d", &c4, &c7, &c47, &c74);
if (c47 == c74 + 1) {
int b4 = c47, b7 = c47;
if (c4 >= b4 && c7 >= b7) {
for (int i = 0; i <= c4 - b4; ++i) {
printf("4");
}
for (int i = 0; i < c74; ++i) {
printf("74");
}
for (int i = 0; i <= c7 - b7; ++i) {
printf("7");
}
printf("\n");
return 0;
}
}
if (c47 == c74) {
int b4 = c47 + 1, b7 = c74;
if (c4 >= b4 && c7 >= b7) {
for (int i = 0; i <= c4 - b4; ++i) {
printf("4");
}
for (int i = 0; i < c74 - 1; ++i) {
printf("74");
}
for (int i = 0; i <= c7 - b7; ++i) {
printf("7");
}
printf("4\n");
return 0;
}
}
if (c47 == c74) {
int b4 = c47, b7 = c74 + 1;
if (c4 >= b4 && c7 >= b7) {
printf("7");
--c74, --c7, --b7;
for (int i = 0; i <= c4 - b4; ++i) {
printf("4");
}
for (int i = 0; i < c74; ++i) {
printf("74");
}
for (int i = 0; i <= c7 - b7; ++i) {
printf("7");
}
printf("\n");
return 0;
}
}
if (c74 == c47 + 1) {
int b4 = c47 + 1, b7 = c74;
if (c4 >= b4 && c7 >= b7) {
printf("7");
--c74, --c7, --b7;
for (int i = 0; i <= c4 - b4; ++i) {
printf("4");
}
for (int i = 0; i < c74 - 1; ++i) {
printf("74");
}
for (int i = 0; i <= c7 - b7; ++i) {
printf("7");
}
printf("4\n");
return 0;
}
}
printf("-1\n");
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int nosol() {
cout << "-1" << endl;
return 0;
}
int main() {
int a[5] = {0};
for (int _n(4), i(0); i < _n; i++) cin >> a[i + 1];
if (abs(a[3] - a[4]) > 1) {
return nosol();
}
if (a[3] - a[4] == 1) {
bool ok = a[2] >= a[3] && a[1] >= a[3];
if (!ok) return nosol();
for (int _n(a[1] - a[3]), i(0); i < _n; i++) cout << '4';
for (int _n(a[3]), i(0); i < _n; i++) cout << "47";
for (int _n(a[2] - a[3]), i(0); i < _n; i++) cout << '7';
return 0;
}
if (a[3] == a[4]) {
bool ok =
a[1] >= a[3] && a[2] >= a[4] + 1 || a[2] >= a[4] && a[1] >= a[3] + 1;
if (!ok) return nosol();
if (a[1] == a[3] && a[2] >= a[4] + 1) {
for (int _n(a[4]), i(0); i < _n; i++) cout << "74";
for (int _n(a[2] - a[4]), i(0); i < _n; i++) cout << '7';
return 0;
}
if (a[2] >= a[4] && a[1] >= a[3] + 1) {
for (int _n(a[1] - a[3] - 1), i(0); i < _n; i++) cout << '4';
for (int _n(a[3]), i(0); i < _n; i++) cout << "47";
for (int _n(a[2] - a[4]), i(0); i < _n; i++) cout << '7';
cout << '4';
return 0;
}
}
if (a[3] - a[4] == -1) {
bool ok = a[2] >= a[4] && a[1] >= a[4];
if (!ok) return nosol();
cout << "74";
for (int _n(a[1] - a[4]), i(0); i < _n; i++) cout << '4';
for (int _n(a[4] - 2), i(0); i < _n; i++) cout << "74";
cout << '7';
for (int _n(a[2] - a[4]), i(0); i < _n; i++) cout << '7';
cout << '4';
return 0;
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
char res[2000000 + 5];
int a1, a2, a3, a4, len = 0;
bool flag = true;
void load() { cin >> a1 >> a2 >> a3 >> a4; }
bool is_exist() {
if ((a3 > a1) || (a3 > a2) || (a4 > a1) || (a4 > a2) || abs(a3 - a4) > 1)
return false;
else
return true;
}
void solve() {
flag = is_exist();
if (!flag) return;
}
bool case1() {
a1 -= a3 + 1, a2 -= a3 + 1;
if (a1 < 0 || a2 < 0) return false;
cout << "7";
for (int i = 0; i < a1; i++) cout << "4";
for (int i = 0; i < a3; i++) cout << "47";
for (int i = 0; i < a2; i++) cout << "7";
cout << "4" << endl;
return true;
}
bool case2(int b1, int b2, int b3, int b4) {
b1 -= b3 + 1, b2 -= b3;
if (b1 < 0 || b2 < 0) return false;
for (int i = 0; i < b1; i++) cout << "4";
for (int i = 0; i < b3; i++) cout << "47";
for (int i = 0; i < b2; i++) cout << "7";
cout << "4" << endl;
return true;
}
bool case3(int b1, int b2, int b3, int b4) {
b1 -= b3, b2 -= b3 + 1;
if (b1 < 0 || b2 < 0) return false;
cout << "7";
for (int i = 0; i < b1; i++) cout << "4";
for (int i = 0; i < b3; i++) cout << "47";
for (int i = 0; i < b2; i++) cout << "7";
return true;
}
bool case4() {
a1 -= a3, a2 -= a3;
if (a1 < 0 || a2 < 0) return false;
for (int i = 0; i < a1; i++) cout << "4";
for (int i = 0; i < a3; i++) cout << "47";
for (int i = 0; i < a2; i++) cout << "7";
cout << endl;
return true;
}
void out() {
if (!flag)
cout << "-1" << endl;
else {
if (a3 < a4) {
flag = case1();
} else if (a3 == a4) {
flag = case2(a1, a2, a3, a4);
if (!flag) flag = case3(a1, a2, a3, a4);
} else {
flag = case4();
}
if (!flag) cout << "-1" << endl;
}
}
int main() {
load();
solve();
out();
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a1, a2, a3, a4;
int AB(int a) {
if (a < 0) return -a;
return a;
}
int main() {
cin >> a1 >> a2 >> a3 >> a4;
int aa = AB(a3 - a4);
if (aa > 1)
cout << -1;
else {
if (aa == 0) {
if (a2 >= a3 && a1 > a3) {
for (int i = 0; i < a1 - a3; i++) cout << 4;
for (int i = 0; i < a3; i++) {
if (i != a3 - 1)
cout << 74;
else {
for (int j = 0; j < a2 - a3; j++) cout << 7;
cout << 74;
}
}
} else if (a1 >= a3 && a2 > a3) {
cout << 7;
for (int i = 0; i < a3; i++) cout << 47;
for (int i = 0; i < a2 - a3 - 1; i++) cout << 7;
} else
cout << -1;
} else if (a3 == a4 + 1) {
if (a1 >= a3 && a2 >= a3) {
for (int i = 0; i < a1 - a3; i++) cout << 4;
for (int i = 0; i < a3; i++) cout << 47;
for (int i = 0; i < a2 - a3; i++) cout << 7;
} else
cout << -1;
} else {
if (a1 >= a4 && a2 >= a4) {
for (int i = 0; i < a4; i++) {
if (i == a4 - 1)
for (int j = 0; j < a2 - a4; j++) cout << 7;
cout << 74;
if (!i)
for (int j = 0; j < a1 - a4; j++) cout << 4;
}
} else
cout << -1;
}
}
}
|
#include <bits/stdc++.h>
using namespace std;
int x, y, xx, yy;
inline string add(string x, char c, int y) {
string res = "";
if (c == '7') reverse(x.begin(), x.end());
for (int i = 0; i < x.size(); ++i) {
res += x[i];
if (x[i] == c) {
for (int j = 1; j <= y; ++j) res += c;
y = 0;
}
}
if (c == '7') reverse(res.begin(), res.end());
return res;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin >> x >> y >> xx >> yy;
if (abs(xx - yy) > 1) {
cout << "-1";
return 0;
}
if (xx == yy) {
if (x >= xx + 1 && y >= xx) {
string res = "";
for (int i = 1; i <= xx + xx + 1; ++i)
if (i & 1)
res += "4";
else
res += "7";
x -= xx + 1;
y -= xx;
res = add(res, '4', x);
res = add(res, '7', y);
cout << res;
return 0;
}
if (x >= xx && y >= xx + 1) {
string res = "";
for (int i = 1; i <= xx + xx + 1; ++i)
if (i & 1)
res += "7";
else
res += "4";
x -= xx;
y -= xx + 1;
res = add(res, '4', x);
res = add(res, '7', y);
cout << res;
return 0;
}
cout << "-1";
exit(0);
}
if (xx > yy) {
if (x >= xx && y >= xx) {
string res = "";
for (int i = 1; i <= xx + xx; ++i)
if (i & 1)
res += "4";
else
res += "7";
x -= xx;
y -= xx;
res = add(res, '4', x);
res = add(res, '7', y);
cout << res;
return 0;
}
cout << "-1";
exit(0);
}
if (x >= yy && y >= yy) {
string res = "";
for (int i = 1; i <= yy + yy; ++i)
if (i & 1)
res += "7";
else
res += "4";
x -= yy;
y -= yy;
res = add(res, '4', x);
res = add(res, '7', y);
cout << res;
exit(0);
}
cout << "-1";
}
|
#include <bits/stdc++.h>
#pragma hdrstop
#pragma argsused
using namespace std;
int main(int argc, char* argv[]) {
int a1, a2, a3, a4, pr;
list<int> q;
cin >> a1 >> a2 >> a3 >> a4;
if (abs(a3 - a4) > 1) {
cout << -1;
return 0;
}
if (a3 > a1 || a3 > a2) {
cout << -1;
return 0;
}
if (a4 > a1 || a4 > a2) {
cout << -1;
return 0;
}
for (int i = 0; i < a3; i++) {
q.push_back(4);
q.push_back(7);
}
a1 -= a3;
a2 -= a3;
a4 -= a3 - 1;
a3 = 0;
while (a4 != 0) {
if (a1 > 0 && q.back() == 7) {
a1--;
q.push_back(4);
a4--;
} else if (a2 > 0 && q.front() == 4) {
a2--;
q.push_front(7);
a4--;
} else {
cout << -1;
return 0;
}
}
if (a1 < 0 || a2 < 0 || a3 < 0 || a4 < 0) {
cout << -1;
return 0;
}
list<int>::iterator it = q.begin();
while (*it != 4 && it != q.end()) it++;
for (int i = 0; i < a1; i++) q.insert(it, 4);
it = q.end();
it--;
while (*it != 7 && it != q.begin()) it--;
for (int i = 0; i < a2; i++) q.insert(it, 7);
for (it = q.begin(); it != q.end(); it++) cout << *it;
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int32_t main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
long long a, b, c, d;
cin >> a >> b >> c >> d;
if (max(c, d) > a || max(d, c) > b || a + b == d + c || abs(c - d) > 1)
return cout << -1, 0;
if (c > d) {
for (long long i = 0; i < a - c; i++) cout << "4";
for (long long i = 0; i < c; i++) cout << "47", b--;
for (long long i = 0; i < b; i++) cout << "7";
} else if (c < d) {
for (long long i = 0; i < d; i++) {
if (i == d - 1) {
for (long long i = 0; i < b - d; i++) cout << "7";
}
cout << "74";
if (i == 0) {
for (long long i = 0; i < a - d; i++) cout << "4";
}
}
} else {
if (a != c) {
for (long long i = 0; i < a - c; i++) cout << "4";
for (long long i = 0; i < c; i++) {
if (i == c - 1) {
for (long long i = 0; i < b - c; i++) cout << "7";
}
cout << "74";
}
} else {
cout << "7";
b--;
for (long long i = 0; i < a - c; i++) cout << "4";
for (long long i = 0; i < c; i++) cout << "47";
for (long long i = 0; i < b - c; i++) cout << "7";
}
}
}
|
#include <bits/stdc++.h>
using namespace std;
vector<int> a;
string build(int cnt1, int cnt2) {
if (cnt1 == cnt2) {
string ret = "";
if (a[0] >= cnt1 + 1) {
for (int i = 0; i < cnt1; ++i) ret += "47", a[0]--, a[1]--;
ret += "4", a[0]--;
return ret;
} else {
for (int i = 0; i < cnt1; ++i) ret += "74", a[0]--, a[1]--;
ret += "7", a[1]--;
return ret;
}
}
string ret = "";
if (cnt1 > cnt2) {
for (int i = 0; i < cnt1; ++i) ret += "47", a[0]--, a[1]--;
} else {
for (int i = 0; i < cnt2; ++i) ret += "74", a[0]--, a[1]--;
}
return ret;
}
int main() {
ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
a.resize(4);
for (int &x : a) cin >> x;
if (abs(a[2] - a[3]) > 1) {
cout << "-1\n";
return 0;
}
int mx1 = 0, mx2 = 0;
string s = "";
if (a[0] > a[1]) {
int cnt_4 = a[0], cnt_7 = a[1];
while (cnt_4 && cnt_7) {
s += "4";
cnt_4--;
s += "7";
cnt_7--;
}
if (cnt_4) s += "4";
} else {
int cnt_4 = a[0], cnt_7 = a[1];
while (cnt_4 && cnt_7) {
s += "7";
cnt_7--;
s += "4";
cnt_4--;
}
if (cnt_7) s += "7";
}
for (int i = 0; i < (int)s.size(); ++i) {
if (s[i] == '4' && s[i + 1] == '7')
mx1++;
else if (s[i] == '7' && s[i + 1] == '4')
mx2++;
}
if (a[2] <= mx1 && a[3] <= mx2) {
string ans = build(a[2], a[3]);
int lst_7 = -1;
for (int i = 0; i < (int)ans.size(); ++i)
if (ans[i] == '7') lst_7 = i;
for (int i = 0; i < (int)ans.size(); ++i) {
if (ans[i] == '4' && a[0]) {
while (a[0]) cout << '4', a[0]--;
}
if (i == lst_7 && a[1]) {
while (a[1]) cout << '7', a[1]--;
}
cout << ans[i];
}
cout << '\n';
return 0;
}
swap(mx1, mx2);
if (a[2] <= mx1 && a[3] <= mx2) {
string ans = build(a[2], a[3]);
int lst_7 = -1;
for (int i = 0; i < (int)ans.size(); ++i)
if (ans[i] == '7') lst_7 = i;
for (int i = 0; i < (int)ans.size(); ++i) {
if (ans[i] == '4' && a[0]) {
while (a[0]) cout << '4', a[0]--;
}
if (i == lst_7 && a[1]) {
while (a[1]) cout << '7', a[1]--;
}
cout << ans[i];
}
cout << '\n';
return 0;
}
cout << "-1\n";
}
|
#include <bits/stdc++.h>
int c4, c7, c47, c74, i;
int main() {
scanf("%d %d %d %d", &c4, &c7, &c47, &c74);
int max = c47 > c74 ? c47 : c74;
if (abs(c47 - c74) > 1 || c4 < max || c7 < max) {
puts("-1");
return 0;
}
if (c47 > c74) {
for (i = 1; i <= c4 - c74; i++) printf("4");
for (i = 1; i <= c74; i++) printf("74");
for (i = 1; i <= c7 - c74; i++) printf("7");
} else if (c47 < c74) {
printf("7");
for (i = 1; i <= c4 - c47; i++) printf("4");
for (i = 1; i <= c47 - 1; i++) printf("74");
for (i = 1; i <= c7 - c47; i++) printf("7");
printf("4");
} else if (c47 == c74) {
if (c4 + c7 < c47 + c74 + 1) {
puts("-1");
return 0;
}
c4--;
for (i = 1; i <= c4 - c47; i++) printf("4");
if (c4 == c47 - 1 && c7 > 1) printf("7"), c7--;
for (i = 1; i <= c47; i++) printf("47");
for (i = 1; i <= c7 - c74; i++) printf("7");
if (c4 - c47 >= 0) printf("4");
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a1, a2, a3, a4;
int main() {
cin >> a1 >> a2 >> a3 >> a4;
if (max(a3, a4) > min(a1, a2) ||
((a3 - a4) > 0 ? (a3 - a4) : (-(a3 - a4))) > 1) {
cout << -1 << endl;
return 0;
}
if (a3 == a4) {
if (a1 >= a3 + 1) {
for (int i = 0; i < a1 - a3 - 1; i++) cout << 4;
for (int i = 0; i < a3 - 1; i++) cout << 47;
cout << 4;
for (int i = 0; i < a2 - a4 + 1; i++) cout << 7;
cout << 4 << endl;
} else if (a2 >= a4 + 1) {
cout << 7;
for (int i = 0; i < a1 - a3 + 1; i++) cout << 4;
for (int i = 0; i < a3 - 1; i++) cout << 74;
for (int i = 0; i < a2 - a3; i++) cout << 7;
cout << endl;
} else
cout << -1 << endl;
return 0;
} else if (a3 == a4 + 1) {
for (int i = 0; i < a1 - a3; i++) cout << 4;
for (int i = 0; i < a4; i++) cout << 47;
cout << 4;
for (int i = 0; i < a2 - a4; i++) cout << 7;
cout << endl;
} else {
cout << 7;
for (int i = 0; i < a1 - a3; i++) cout << 4;
for (int i = 0; i < a3 - 1; i++) cout << 74;
for (int i = 0; i < a2 - a3; i++) cout << 7;
cout << 4 << endl;
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int a, b, c, d, p;
cin >> a >> b >> c >> d;
d -= c - 1;
a -= c;
b -= c;
if (d == 2) {
a--;
b--;
p = 3;
} else if (d == 1) {
if (a) {
a--;
p = 1;
} else {
b--;
p = 2;
}
}
if (a < 0 || b < 0 || d > 2 || d < 0) {
cout << -1 << endl;
return 0;
} else {
if (p & 2) cout << 7;
for (; a > 0; a--) cout << 4;
for (; c > 0; c--) cout << "47";
for (; b > 0; b--) cout << 7;
if (p & 1) cout << 4;
cout << endl;
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int arr[2000005];
int main() {
int a1, a2, a3, a4;
scanf("%d %d %d %d", &a1, &a2, &a3, &a4);
if (min(a1, a2) >= max(a3, a4) && abs(a3 - a4) <= 1 &&
(a1 + a2 >= a3 + a4 + 1)) {
int n = a3 + a4 + 1, p, f1, f2;
if (a3 > a4)
p = 4;
else if (a3 < a4)
p = 7;
else if (a1 == a3)
p = 7;
else
p = 4;
arr[0] = p;
for (int i = 1; i < n; i++) arr[i] = 11 - arr[i - 1];
for (int i = 0; i < n; i++)
if (arr[i] == 4) {
f1 = i;
break;
}
for (int i = n - 1; i >= 0; i--)
if (arr[i] == 7) {
f2 = i;
break;
}
for (int i = 0; i < n; i++)
if (arr[i] == 4)
a1--;
else
a2--;
for (int i = 0; i < n; i++) {
printf("%d", arr[i]);
if (f1 == i)
while (a1--) printf("4");
if (f2 == i)
while (a2--) printf("7");
}
printf("\n");
} else
printf("-1\n");
}
|
#include <bits/stdc++.h>
int main() {
std::string str = "";
int a1, a2, a3, a4;
std::cin >> a1 >> a2 >> a3 >> a4;
if (std::abs(a3 - a4) > 1) {
std::cout << "-1";
return 0;
};
if (a3 == a4)
if ((std::min(a1, a2) < a3) || (std::max(a1, a2) <= a3)) {
std::cout << "-1";
return 0;
};
if (a3 != a4)
if (std::min(a1, a2) < std::max(a3, a4)) {
std::cout << "-1";
return 0;
};
for (int i = 0; i < (a3); ++i) str += "47";
a1 -= a3;
a2 -= a3;
a4 -= a3 - 1;
if (a4 == 1) {
if (a1) {
str += "4";
--a1;
} else if (a2) {
str = "7" + str;
--a2;
}
} else if (a4 == 2) {
str = "7" + str + "4";
--a1;
--a2;
}
std::string _1(a1, '4'), _2(a2, '7');
str.insert(str.find_first_of("4"), _1);
str.insert(str.find_last_of("7"), _2);
std::cout << str;
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a1, a2, a3, a4;
int main() {
scanf("%d%d%d%d", &a1, &a2, &a3, &a4);
if (abs(a3 - a4) > 1) {
printf("-1\n");
return 0;
}
if (a1 < a3 || a2 < a4 || a1 < a4 || a2 < a3) {
printf("-1\n");
return 0;
}
if (a3 == a4) {
if ((a1 - a3 - 1 < 0) || (a2 - a3 < 0)) {
if ((a1 - a4 < 0) || (a2 - a4 - 1 < 0))
printf("-1\n");
else {
printf("7");
for (int a = 1; a <= a1 - a3; a++) printf("4");
for (int a = 1; a <= a3; a++) printf("47");
for (int a = 1; a <= a2 - a4 - 1; a++) printf("7");
printf("\n");
}
return 0;
}
for (int a = 1; a <= a1 - a3 - 1; a++) printf("4");
for (int a = 1; a <= a3; a++) printf("47");
for (int a = 1; a <= a2 - a3; a++) printf("7");
printf("4\n");
} else {
if (a3 < a4) {
if ((a1 - a3 - 1 < 0) || (a2 - a3 - 1 < 0)) {
printf("-1\n");
return 0;
}
printf("7");
for (int a = 1; a <= a1 - a3 - 1; a++) printf("4");
for (int a = 1; a <= a3; a++) printf("47");
for (int a = 1; a <= a2 - a3 - 1; a++) printf("7");
printf("4");
printf("\n");
} else {
if ((a1 - a3 < 0) || (a2 - a3 < 0)) {
printf("-1\n");
return 0;
}
for (int a = 1; a <= a1 - a3; a++) printf("4");
for (int a = 1; a <= a3; a++) printf("47");
for (int a = 1; a <= a2 - a3; a++) printf("7");
printf("\n");
}
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
const int M = 100100, mod = 1000000007;
string ans;
int main() {
int a, b, ab, ba, i, j, k, temp;
scanf("%d%d", &a, &b);
scanf("%d%d", &ab, &ba);
if (abs(ab - ba) > 1) {
printf("%s\n", "-1");
return 0;
};
if (ab > ba) {
if (a < ab || b < ab) {
printf("%s\n", "-1");
return 0;
};
for (i = 0; i < ab; i++) {
ans += '4';
a--;
ans += '7';
b--;
}
for (i = 0; i < a; i++) cout << '4';
cout << ans;
for (i = 0; i < b; i++) cout << '7';
cout << endl;
} else if (ba > ab) {
if (a < ba || b < ba) {
printf("%s\n", "-1");
return 0;
};
a--;
b--;
for (i = 0; i < ab; i++) {
ans += '4';
a--;
ans += '7';
b--;
}
cout << '7';
for (i = 0; i < a; i++) cout << '4';
cout << ans;
for (i = 0; i < b; i++) cout << '7';
cout << '4';
cout << endl;
} else {
if (a < ab || b < ab) {
printf("%s\n", "-1");
return 0;
};
if (a == ab) {
if (b == a) {
printf("%s\n", "-1");
return 0;
};
for (i = 0; i < ba; i++) cout << "74";
for (i = 0; i < b - ab; i++) cout << '7';
{
printf("%s\n", "");
return 0;
};
} else {
a--;
for (i = 0; i < a - ab; i++) cout << '4';
for (i = 0; i < ab; i++) cout << "47";
for (i = 0; i < b - ab; i++) cout << '7';
cout << '4';
}
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
const int N = 510;
const int M = 10010;
const int K = 510;
const int LIT = 2500;
const int INF = 1 << 30;
int a1, a2, a3, a4;
char c[3] = {'4', '7'};
void init() {}
string cal(int b1, int b2, int b3, int b4, int beg) {
string ret;
ret += c[beg];
bool f = beg ^ 1;
while (1) {
if (!b3 || !b4) break;
ret += c[f];
if (f)
b2--, b3--;
else
b1--, b4--;
f ^= 1;
}
if (b3 && !f) return "";
if (b4 && f) return "";
if (b3 && f) b2--, b3--, ret += c[f];
if (b4 && !f) b1--, b4--, ret += c[f];
if (b1 < 0 || b2 < 0 || b3 || b4) return "";
string pre, pst;
while (b1--) pre += "4";
while (b2--) pst += "7";
string ans;
int len = ret.size();
int p1, p2;
for (p1 = len - 1; p1 >= 0; p1--)
if (ret[p1] == '7') break;
for (p2 = 0; p2 < len; p2++)
if (ret[p2] == '4') break;
for (int i = 0; i <= p2; i++) ans += ret[i];
ans += pre;
for (int i = p2 + 1; i <= p1; i++) ans += ret[i];
ans += pst;
for (int i = p1 + 1; i < len; i++) ans += ret[i];
return ans;
}
void solve() {
string s1 = cal(a1 - 1, a2, a3, a4, 0);
string s2 = cal(a1, a2 - 1, a3, a4, 1);
if (s1 == "" && s2 == "")
cout << -1 << endl;
else {
if (s1 == "")
cout << s2 << endl;
else if (s2 == "")
cout << s1 << endl;
else
cout << min(s1, s2) << endl;
}
}
int main() {
while (cin >> a1 >> a2 >> a3 >> a4) {
init();
solve();
}
}
|
#include <bits/stdc++.h>
#pragma comment(linker, "/STACK:16777216")
using namespace std;
const int INF = 1e9;
const double Pi = acos(-1.0);
const long double Eps = 1e-8;
const int MAXN = 4e6;
char ans[MAXN + 1];
int len = 0;
int main() {
int a[4];
for (int i = 0; i < 4; i++) scanf("%d", a + i);
if (abs(a[2] - a[3]) > 1) {
puts("-1");
return 0;
}
int four, seven;
if (a[2] > a[3]) {
four = a[0] - a[2];
seven = a[1] - a[2];
if (four < 0 || seven < 0) {
puts("-1");
return 0;
}
for (int i = 0; i < four; i++) ans[len++] = '4';
for (int i = 0; i < a[2]; i++) {
ans[len++] = '4';
ans[len++] = '7';
}
for (int i = 0; i < seven; i++) ans[len++] = '7';
} else if (a[2] < a[3]) {
four = a[0] - a[3];
seven = a[1] - a[3];
if (four < 0 || seven < 0) {
puts("-1");
return 0;
}
if (a[3] == 1) {
for (int i = 0; i < seven; i++) ans[len++] = '7';
ans[len++] = '7';
ans[len++] = '4';
for (int i = 0; i < four; i++) ans[len++] = '4';
} else {
ans[len++] = '7';
for (int i = 0; i < four + 1; i++) ans[len++] = '4';
for (int i = 0; i < a[3] - 2; i++) {
ans[len++] = '7';
ans[len++] = '4';
}
for (int i = 0; i < seven + 1; i++) ans[len++] = '7';
ans[len++] = '4';
}
} else {
four = a[0] - a[2];
seven = a[1] - a[2];
if (four < 0 || seven < 0 || !four && !seven) {
puts("-1");
return 0;
}
if (four) {
for (int i = 0; i < four - 1; i++) ans[len++] = '4';
for (int i = 0; i < a[2] - 1; i++) {
ans[len++] = '4';
ans[len++] = '7';
}
ans[len++] = '4';
for (int i = 0; i < seven + 1; i++) ans[len++] = '7';
ans[len++] = '4';
} else {
for (int i = 0; i < a[3]; i++) {
ans[len++] = '7';
ans[len++] = '4';
}
for (int i = 0; i < seven; i++) ans[len++] = '7';
}
}
ans[len] = '\0';
puts(ans);
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
string s1 = "47";
string s2 = "74";
string res;
int main() {
int a1, a2, a3, a4;
cin >> a1 >> a2 >> a3 >> a4;
if (abs(a3 - a4) <= 1) {
if (a3 > a4) {
a1 -= a3;
a2 -= a3;
if (a1 >= 0 && a2 >= 0) {
for (int i = 0; i < a1; i++) cout << '4';
for (int i = 0; i < a3; i++) cout << s1;
for (int i = 0; i < a2; i++) cout << '7';
} else
cout << -1;
}
if (a3 == a4) {
a1 -= a3;
a2 -= a3;
if (a1 == 0 && a2 == 0 || a1 < 0 || a2 < 0) {
cout << -1;
return 0;
}
if (a1 >= 0 || a2 >= 0) {
if (a1 && a2 == 0) {
for (int i = 0; i < a1 - 1; i++) cout << '4';
for (int i = 0; i < a3; i++) cout << s1;
cout << '4';
} else {
if (a1 == 0 && a2) {
cout << '7';
for (int i = 0; i < a3; i++) cout << s1;
for (int i = 0; i < a2 - 1; i++) cout << '7';
} else {
for (int i = 0; i < a1 - 1; i++) cout << '4';
for (int i = 0; i < a3; i++) cout << s1;
for (int i = 0; i < a2; i++) cout << '7';
cout << '4';
}
}
} else
cout << -1;
}
if (a3 < a4) {
a1 -= a4;
a2 -= a4;
if (a1 >= 0 && a2 >= 0) {
cout << '7';
for (int i = 0; i < a1; i++) cout << '4';
for (int i = 0; i < a3; i++) cout << s1;
for (int i = 0; i < a2; i++) cout << '7';
cout << '4';
} else {
cout << -1;
}
}
} else {
cout << -1;
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int TESTS = 1;
while (TESTS--) {
int i, a1, a2, a3, a4;
cin >> a1 >> a2 >> a3 >> a4;
if (abs(a3 - a4) > 1)
cout << "-1";
else {
if (a3 != a4 && min(a1, a2) < max(a3, a4))
cout << "-1";
else if (a3 == a4 && ((min(a1, a2) < a3) || (max(a1, a2) < a3 + 1)))
cout << "-1";
else {
string t1, t2, st = "47", ans;
for (i = 0; i < a1 - max(a3, a4); i++) t1 += '4';
for (i = 0; i < a2 - max(a3, a4); i++) t2 += '7';
if (a3 > a4) {
for (i = 0; i < a3; i++) ans += st;
ans = t1 + ans + t2;
} else if (a3 < a4) {
for (i = 0; i < a4 - 1; i++) ans += st;
ans = "7" + t1 + ans + t2 + "4";
} else {
if (a2 > a1 && a1 == a3) {
for (i = 0; i < a3; i++) ans += st;
ans = "7" + ans + t2.substr(0, t2.length() - 1);
} else if (a1 >= a2) {
for (i = 0; i < a3; i++) ans += st;
ans = t1.substr(0, t1.length() - 1) + ans + t2 + "4";
} else {
string st1 = "47", t3, t4;
for (i = 0; i < a3; i++) ans += st1;
for (i = 0; i < a1 - a3 - 1; i++) t3 += '4';
for (i = 0; i < a2 - a3 - 1; i++) t4 += '7';
ans = t3 + ans + t4 + "74";
}
}
cout << ans;
}
}
}
}
|
#include <bits/stdc++.h>
using namespace std;
const int inv = numeric_limits<int>::max();
const int minv = numeric_limits<int>::min();
const int max_c = 1000000;
int a1, a2, a3, a4;
int ns4, ns7, fs4, ls7;
char init;
void show() {
fs4 = a1 - ns4 + 1;
ls7 = a2 - ns7 + 1;
int ps4 = 0, ps7 = 0;
char tbp = init;
while (ps4 < ns4 or ps7 < ns7) {
if (tbp == '4') {
if (ps4 == 0) {
for (int i = 0; i < fs4; ++i) printf("4");
} else
printf("4");
++ps4;
tbp = '7';
} else {
if (ps7 == ns7 - 1) {
for (int i = 0; i < ls7; ++i) printf("7");
} else {
printf("7");
}
++ps7;
tbp = '4';
}
}
printf("\n");
return;
}
int main() {
scanf("%d %d %d %d", &a1, &a2, &a3, &a4);
if (a3 == a4) {
if (a1 >= a3 + 1 and a2 >= a4) {
init = '4';
ns4 = a3 + 1;
ns7 = a4;
show();
return 0;
} else if (a1 >= a3 and a2 >= a4 + 1) {
init = '7';
ns4 = a3;
ns7 = a4 + 1;
show();
return 0;
}
} else if (a3 + 1 == a4) {
if (a1 >= a4 and a2 >= a4) {
init = '7';
ns4 = a4;
ns7 = a4;
show();
return 0;
}
} else if (a4 + 1 == a3) {
if (a1 >= a3 and a2 >= a3) {
init = '4';
ns4 = a3;
ns7 = a3;
show();
return 0;
}
}
printf("-1\n");
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
bool Spr(string nap, int a, int b, int c, int d) {
int e = 0, f = 0, g = 0, h = 0;
for (int i = 0; i < nap.size(); ++i) {
if (nap[i] == '4') ++e;
if (nap[i] == '7') ++f;
if (i + 1 < nap.size() && nap[i] == '4' && nap[i + 1] == '7') ++g;
if (i + 1 < nap.size() && nap[i] == '7' && nap[i + 1] == '4') ++h;
}
if (a == e && b == f && c == g && d == h) return true;
return false;
}
int main() {
ios_base::sync_with_stdio(0);
int a, b, c, d;
cin >> a >> b >> c >> d;
string odp = "-1";
if (c == d) {
string t = "7";
for (int i = 0; i < c; ++i) t += "47";
if (c < a) {
t.erase(0, 1);
string cz(a - c, '4');
t = "7" + cz + t;
}
if (c + 1 < b) {
string si(b - c - 1, '7');
t = t + si;
}
if (Spr(t, a, b, c, d)) odp = t;
t = "";
for (int i = 0; i < c; ++i) t += "47";
t += "4";
if (c + 1 < a) {
string cz(a - c - 1, '4');
t = cz + t;
}
if (c < b) {
t.erase(t.size() - 1, 1);
string si(b - c, '7');
t = t + si + "4";
}
if (Spr(t, a, b, c, d)) odp = t;
}
if (c == d - 1) {
string t = "";
for (int i = 0; i < d; ++i) t += "74";
if (d < a) {
t.erase(0, 1);
string cz(a - d, '4');
t = "7" + cz + t;
}
if (d < b) {
t.erase(t.size() - 1, 1);
string si(b - d, '7');
t = t + si + "4";
}
if (Spr(t, a, b, c, d)) odp = t;
}
if (c == d + 1) {
string t = "";
for (int i = 0; i < c; ++i) t += "47";
if (c < a) {
string cz(a - c, '4');
t = cz + t;
}
if (c < b) {
string si(b - c, '7');
t = t + si;
}
if (Spr(t, a, b, c, d)) odp = t;
}
cout << odp;
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
vector<string> getRoot(int a3, int a4, int a1, int a2) {
vector<string> ret;
string s = "";
int x = 0, y = 0;
int c1 = a1, c2 = a2;
bool flag = true;
for (int i = 0; i < 2; i++) {
while (true) {
if (flag) {
if (s.size() > 0 && s[s.size() - 1] == '7') {
if (y + 1 > a4) break;
y++;
}
s += "4";
c1--;
} else {
if (s.size() > 0 && s[s.size() - 1] == '4') {
if (x + 1 > a3) break;
x++;
}
s += "7";
c2--;
}
flag = !flag;
}
if (x == a3 && y == a4 && c1 >= 0 && c2 >= 0) ret.push_back(s);
flag = false;
s = "";
x = y = 0;
c1 = a1, c2 = a2;
}
return ret;
}
void solve(string root, int a1, int a2, int a3, int a4) {
int aa, bb;
aa = a1, bb = a2;
for (int j = 0; j < root.size(); j++)
if (root[j] == '4')
aa--;
else if (root[j] == '7')
bb--;
if (aa == -1 || bb == -1) {
cout << -1 << endl;
return;
}
int pos = root.size();
for (int i = root.size() - 1; i >= 0; i--) {
if (root[i] == '7') {
pos = i;
break;
}
}
string r = "";
for (int i = 0; i < root.size(); i++) {
if (root[i] == '4' && aa != 0) {
cout << string(aa, '4');
aa = 0;
} else if (pos == i) {
cout << string(bb, '7');
bb = 0;
}
cout << root[i];
}
if (aa != 0) cout << string(aa, '4');
if (bb != 0) cout << string(bb, '7');
cout << endl;
}
int main() {
int a1, a2, a3, a4;
cin >> a1 >> a2 >> a3 >> a4;
if (abs(a3 - a4) > 1) {
cout << "-1" << endl;
} else {
vector<string> roots = getRoot(a3, a4, a1, a2);
string res = "";
for (int i = 0; i < roots.size(); i++) {
if (res == "")
res = roots[i];
else
res = min(res, roots[i]);
}
if (res == "")
cout << -1 << endl;
else
solve(res, a1, a2, a3, a4);
}
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int i, j, k, m, n;
int a1, a2, a3, a4;
m = n = 0;
while (scanf("%d%d%d%d", &a1, &a2, &a3, &a4) != EOF) {
m = max(a3, a4);
n = min(a3, a4);
if (m - n > 1 || a1 < m || a2 < m || a1 + a2 <= a3 + a4) {
puts("-1");
} else {
if (a3 == a4) {
a1 -= a3;
a2 -= a3;
if (a1 > 0) {
for (i = 0; i < a1 - 1; i++) {
putchar('4');
}
for (i = 0; i < a3; i++) {
putchar('4');
putchar('7');
}
for (i = 0; i < a2; i++) {
putchar('7');
}
putchar('4');
} else {
putchar('7');
for (i = 0; i < a3; i++) {
putchar('4');
putchar('7');
}
for (i = 0; i < a2 - 1; i++) {
putchar('7');
}
}
} else if (a3 + 1 == a4) {
a1 -= a4;
a2 -= a4;
putchar('7');
for (i = 0; i < a1; i++) putchar('4');
for (i = 0; i < a3; i++) printf("47");
for (i = 0; i < a2; i++) putchar('7');
putchar('4');
} else if (a4 + 1 == a3) {
a1 -= a3;
a2 -= a3;
for (i = 0; i < a1; i++) putchar('4');
for (i = 0; i < a3; i++) printf("47");
for (i = 0; i < a2; i++) putchar('7');
}
puts("");
}
}
}
|
#include <bits/stdc++.h>
using namespace std;
int main(void) {
int a1, a2, a3, a4, flag = 1;
string str;
cin >> a1 >> a2 >> a3 >> a4;
if (a3 <= a1 && a3 <= a2 && a4 <= a1 && a4 <= a2 && abs(a3 - a4) < 2) {
if (a3 == a4) {
if (a1 > a3) {
for (int i = 0; i < a3; i++) str += "47";
str += "4";
a1 -= (a3 + 1);
a2 -= a3;
} else if (a2 > a3) {
for (int i = 0; i < a3; i++) str += "74";
str += "7";
a1 -= a3;
a2 -= (a3 + 1);
} else
flag = 0;
} else if (a3 > a4) {
for (int i = 0; i < a3; i++) str += "47";
a1 -= a3;
a2 -= a3;
} else if (a4 > a3) {
for (int i = 0; i < a4; i++) str += "74";
a1 -= a4;
a2 -= a4;
}
} else
flag = 0;
if (flag == 0)
cout << "-1";
else {
cout << str[0];
if (a1 != 0)
for (int i = 0; i < a1; i++) cout << "4";
for (int i = 1; i < str.size() - 1; i++) cout << str[i];
if (a2 != 0)
for (int i = 0; i < a2; i++) cout << "7";
cout << str[str.size() - 1];
}
cout << "\n";
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
const long long MAXN = 1e5 + 5;
const long long INF = 1e9;
const long long MOD = 1e9 + 33;
int abss(int x) { return x < 0 ? -x : x; }
void no() {
cout << -1 << "\n";
exit(0);
}
void zero() {
cout << 0 << "\n";
exit(0);
}
string smaller(string &a, string &b) {
if (a == "-" && b == "-") return "-1";
if (a == "-") return b;
if (b == "-") return a;
if (a.size() < b.size())
return a;
else if (b.size() < a.size())
return b;
for (int i = 0; i < (int)a.size(); i++)
if (a[i] < b[i])
return a;
else if (b[i] < a[i])
return b;
return a;
}
string unusedi4(string &s, int x) {
if (x < 0) return s;
bool bb = false;
if (s.size() && s[0] == '7') bb = true;
if (bb) s = s.substr(1);
reverse(s.begin(), s.end());
while (x--) s += "4";
reverse(s.begin(), s.end());
if (bb) s = "7" + s;
return s;
}
string unusedi7(string &s, int x) {
if (x < 0) return s;
bool bb = false;
if (s.size() && s[s.size() - 1] == '4') bb = true;
if (bb) s.pop_back();
while (x--) s += "7";
if (bb) s += "4";
return s;
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(NULL);
cout.tie(NULL);
string ans = "", ans4 = "", ans7 = "";
int i4, i7, i47, i74;
int u4 = 0, u7 = 0;
int ubegin4_4 = 0, ubegin4_7 = 0;
int ubegin7_4 = 0, ubegin7_7 = 0;
cin >> i4 >> i7 >> i47 >> i74;
if (i4 == 0 && i7 == 0 && i47 == 0 && i74 == 0) zero();
if (abss(i47 - i74) > 1) no();
if (i47 > i74) {
u4 = u7 = i47;
while (i47--) ans += "47";
} else if (i74 > i47) {
u4 = u7 = i74;
while (i74--) ans += "74";
} else {
ubegin4_4 = ubegin4_7 = ubegin7_4 = ubegin7_7 = i74;
i47 = -2;
while (i74--) {
ans4 += "47";
ans7 += "74";
}
ans4 += "4";
ubegin4_4++;
ans7 += "7";
ubegin7_7++;
}
if (u7 > i7 || u4 > i4) no();
ans = unusedi4(ans, i4 - u4);
ans = unusedi7(ans, i7 - u7);
if (i47 == -2) {
ans4 = unusedi4(ans4, i4 - ubegin4_4);
ans4 = unusedi7(ans4, i7 - ubegin4_7);
if (i4 < ubegin4_4 || i7 < ubegin4_7) ans4 = "-";
ans7 = unusedi4(ans7, i4 - ubegin7_4);
ans7 = unusedi7(ans7, i7 - ubegin7_7);
if (i4 < ubegin7_4 || i7 < ubegin7_7) ans7 = "-";
cout << smaller(ans4, ans7) << "\n";
} else {
cout << ans << "\n";
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a, b, c, d;
char s[3000007];
void case1() {
int now = 0;
for (int i = 0; i < a - c; ++i) s[now++] = '4';
for (int i = 0; i < c; ++i) s[now++] = '4', s[now++] = '7';
for (int i = 0; i < b - c; ++i) s[now++] = '7';
s[now] = 0;
}
void case2() {
int now = 0;
s[now++] = '7', s[now++] = '4';
for (int i = 0; i < a - d; ++i) s[now++] = '4';
for (int i = 0; i < d - 2; ++i) s[now++] = '7', s[now++] = '4';
for (int i = 0; i < b - d; ++i) s[now++] = '7';
s[now++] = '7', s[now++] = '4';
s[now] = 0;
}
void case3() {
int now = 0;
for (int i = 0; i < a - d; ++i) s[now++] = '4';
for (int i = 0; i < d - 1; ++i) s[now++] = '7', s[now++] = '4';
for (int i = 0; i < b - d; ++i) s[now++] = '7';
s[now++] = '7', s[now++] = '4';
s[now] = 0;
}
void case4() {
int now = 0;
s[now++] = '7', s[now++] = '4';
for (int i = 0; i < a - d; ++i) s[now++] = '4';
for (int i = 0; i < d - 1; ++i) s[now++] = '7', s[now++] = '4';
for (int i = 0; i < b - d; ++i) s[now++] = '7';
s[now] = 0;
}
int main() {
cin >> a >> b >> c >> d;
if (c == d + 1 && b >= c && a >= c) {
case1();
cout << s << endl;
return 0;
}
if (d == c + 1 && a >= d && b >= d) {
case2();
cout << s << endl;
return 0;
}
if (c == d && b >= d && a >= d + 1) {
case3();
cout << s << endl;
return 0;
}
if (c == d && b >= d + 1 && a >= d) {
case4();
cout << s << endl;
return 0;
}
cout << -1 << endl;
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
void no() {
cout << -1 << "\n";
exit(0);
}
int32_t main() {
ios::sync_with_stdio(0);
cin.tie(0);
map<long long, long long> col;
cin >> col[4];
cin >> col[7];
cin >> col[47];
cin >> col[74];
if (abs(col[47] - col[74]) > 1) {
no();
}
string an = "";
if (col[47] >= col[74]) {
for (long long i = 0; i < col[47]; ++i) {
col[4]--;
col[7]--;
an += "47";
}
if (col[47] == col[74]) {
if (col[4] > 0) {
an += "4";
col[4]--;
} else if (col[7] > 0) {
an = "7" + an;
col[7]--;
} else {
no();
}
}
col[47] = 0;
col[74] = 0;
} else {
for (long long i = 0; i < col[74]; ++i) {
an += "74";
col[7]--;
col[4]--;
}
col[74] = 0;
col[47] = 0;
}
if (col[47] == col[74] && col[47] > 0) {
if (an[((long long)an.size()) - 1] == '4') {
an += '7';
col[7]--;
} else {
an += '4';
col[4]--;
}
}
if (col[4] < 0 || col[7] < 0) {
no();
}
long long sev = (long long)count((an).begin(), (an).end(), '7');
for (char c : an) {
if (c == '4') {
if (col[4] > 0) {
for (long long i = 0; i < col[4]; ++i) {
cout << '4';
}
col[4] = 0;
}
} else {
if (col[7] > 0 && sev == 1) {
for (long long i = 0; i < col[7]; ++i) {
cout << '7';
}
col[7] = 0;
}
}
sev -= c == '7';
cout << c;
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
void NO() {
cout << -1;
exit(0);
}
int main() {
int a4;
int a7;
int a47;
int a74;
cin >> a4 >> a7 >> a47 >> a74;
if (a47 == a74) {
if (a4 == a47) {
if (a7 >= a47 + 1) {
for (int i = 1; i <= a74; i++) {
cout << "74";
}
for (int i = 1; i <= a7 - a74; i++) {
cout << "7";
}
} else {
NO();
}
} else if (a4 > a47) {
if (a7 >= a47) {
for (int i = 1; i <= a4 - a74 - 1; i++) {
cout << "4";
}
for (int i = 1; i <= a74; i++) {
cout << "47";
}
for (int i = 1; i <= a7 - a47; i++) {
cout << "7";
}
cout << "4";
} else {
NO();
}
} else {
NO();
}
} else if (a47 == a74 + 1) {
if (a4 >= a47 && a7 >= a47) {
for (int i = 1; i <= a4 - a47; i++) {
cout << "4";
}
for (int i = 1; i <= a47; i++) {
cout << "47";
}
for (int i = 1; i <= a7 - a47; i++) {
cout << "7";
}
} else {
NO();
}
} else if (a74 == a47 + 1) {
if (a4 >= a74 && a7 >= a74) {
cout << "74";
for (int i = 1; i <= a4 - a74; i++) {
cout << "4";
}
for (int i = 1; i <= a74 - 2; i++) {
cout << "74";
}
for (int i = 1; i <= a7 - a74; i++) {
cout << "7";
}
cout << "74";
} else {
NO();
}
} else {
NO();
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a, b, c, d;
int main() {
scanf("%d%d%d%d", &a, &b, &c, &d);
if (c == d) {
if (a >= c && b >= c && a + b >= c + c + 1) {
if (a >= c + 1) {
for (int i = 0; i < a - c; i++) putchar('4');
for (int i = 0; i < c - 1; i++) printf("74");
for (int i = 0; i < b - c + 1; i++) putchar('7');
puts("4");
} else {
for (int i = 0; i < c; i++) printf("74");
for (int i = 0; i < b - c; i++) putchar('7');
}
} else
puts("-1");
} else if (c == d + 1) {
if (a >= c && b >= c) {
for (int i = 0; i < a - c + 1; i++) putchar('4');
for (int i = 0; i < c - 1; i++) printf("74");
for (int i = 0; i < b - c + 1; i++) putchar('7');
} else
puts("-1");
} else if (c + 1 == d) {
if (a >= d && b >= d) {
putchar('7');
for (int i = 0; i < a - c; i++) putchar('4');
for (int i = 0; i < c - 1; i++) printf("74");
for (int i = 0; i < b - c; i++) putchar('7');
putchar('4');
} else
puts("-1");
} else
puts("-1");
}
|
#include <bits/stdc++.h>
using namespace std;
const long long mod = (long long)(1e9 + 7);
long long modpow(long long a, long long b) {
if (!b) return 1;
a %= mod;
return modpow(a * a % mod, b / 2) * (b & 1 ? a : 1) % mod;
}
string construct(int a, int b) {
string s;
char nxt = a >= b ? '4' : '7';
for (int i = 0; i < a + b + 1; i++) {
s += nxt;
if (nxt == '4')
nxt = '7';
else
nxt = '4';
}
return string(s);
}
string construct2(int a, int b) {
string s;
char nxt = a > b ? '4' : '7';
for (int i = 0; i < a + b + 1; i++) {
s += nxt;
if (nxt == '4')
nxt = '7';
else
nxt = '4';
}
return string(s);
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int a, b, c, d;
cin >> a >> b >> c >> d;
if (abs(c - d) > 1)
cout << -1 << endl;
else {
string s = construct(c, d);
int n = s.length();
a -= s[0] == '4' ? (n + 1) / 2 : n / 2;
b -= s[0] == '7' ? (n + 1) / 2 : n / 2;
if (a < 0 || b < 0) {
a += s[0] == '4' ? (n + 1) / 2 : n / 2;
b += s[0] == '7' ? (n + 1) / 2 : n / 2;
s = construct2(c, d);
n = s.length();
a -= s[0] == '4' ? (n + 1) / 2 : n / 2;
b -= s[0] == '7' ? (n + 1) / 2 : n / 2;
if (a < 0 || b < 0) {
cout << -1 << endl;
exit(0);
}
}
if (s[0] == s[n - 1]) {
if (s[0] == '4')
cout << string(a + 1, '4') << s.substr(1, n - 2) << string(b, '7')
<< s[n - 1] << endl;
else
cout << s[0] << string(a, '4') << s.substr(1) << string(b, '7') << endl;
} else if (s[0] == '4')
cout << string(a, '4') << s << string(b, '7') << endl;
else
cout << s[0] << string(a, '4') << s.substr(1, n - 2) << string(b, '7')
<< s[n - 1] << endl;
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
char data[1000005];
int main() {
int a1, a2, a3, a4;
cin >> a1 >> a2 >> a3 >> a4;
if (!(abs(a3 - a4) == 1 || a3 == a4)) {
cout << "-1\n";
return 0;
}
if (a3 - a4 == 1) {
int snum = a3;
a2 = a2 - a3;
a1 = a1 - a3;
if (a1 < 0 || a2 < 0) {
cout << "-1\n";
return 0;
}
for (int i = 1; i <= a1; i++) cout << '4';
for (int i = 1; i <= snum; i++) cout << "47";
for (int i = 1; i <= a2; i++) cout << '7';
cout << endl;
return 0;
}
if (a4 == a3) {
int snum = a3;
a2 = a2 - snum;
a1 = a1 - snum;
if (a1 < 0 || a2 < 0) {
cout << "-1\n";
return 0;
}
if (a1 >= 1) {
for (int i = 1; i <= a1 - 1; i++) cout << '4';
for (int i = 1; i <= snum; i++) cout << "47";
for (int i = 1; i <= a2; i++) cout << '7';
cout << '4';
cout << endl;
} else {
if (a2 >= 1) {
cout << '7';
for (int i = 1; i <= snum; i++) cout << "47";
for (int i = 1; i <= a2 - 1; i++) cout << '7';
cout << endl;
} else {
cout << "-1\n";
return 0;
}
}
return 0;
}
if (a4 - a3 == 1) {
int snum = a3;
a1 = a1 - a3 - 1;
a2 = a2 - a3 - 1;
if (a1 < 0 || a2 < 0) {
cout << "-1\n";
return 0;
}
cout << '7';
for (int i = 1; i <= a1; i++) cout << '4';
for (int i = 1; i <= snum; i++) cout << "47";
for (int i = 1; i <= a2; i++) cout << '7';
cout << '4';
cout << endl;
return 0;
}
}
|
#include <bits/stdc++.h>
using namespace std;
int mark[2000005];
int main() {
ios_base::sync_with_stdio(0);
cin.tie(nullptr);
long long a1, a2, a3, a4;
cin >> a1 >> a2 >> a3 >> a4;
if (((a3 - a4) < 0 ? -(a3 - a4) : (a3 - a4)) > 1) {
cout << -1 << endl;
return 0;
}
deque<int> v;
if (a3 == a4) {
if (a1 >= a3 + 1) {
for (int i = 1; i <= a3; i++) {
v.push_back(4);
v.push_back(7);
}
v.push_back(4);
} else {
for (int i = 1; i <= a3; i++) {
v.push_back(7);
v.push_back(4);
}
v.push_back(7);
}
} else if (a3 > a4) {
for (int i = 1; i <= a3; i++) {
v.push_back(4);
v.push_back(7);
}
} else {
for (int i = 1; i <= a4; i++) {
v.push_back(7);
v.push_back(4);
}
}
int four = count(v.begin(), v.end(), 4);
int seven = count(v.begin(), v.end(), 7);
if (four > a1 or seven > a2) {
cout << -1 << endl;
return 0;
}
for (int i = 0; i < v.size(); i++) {
if (v[i] == 4) {
mark[i] = a1 - four;
break;
}
}
for (int i = v.size() - 1; i >= 0; i--) {
if (v[i] == 7) {
mark[i] = a2 - seven;
break;
}
}
for (int i = 0; i < v.size(); i++) {
cout << v[i];
while (mark[i]) {
mark[i]--;
cout << v[i];
}
}
cout << endl;
}
|
#include <bits/stdc++.h>
using namespace std;
const double eps = 1e-5;
const int inf = (1 << 31) - 1;
const int hinf = 0x3f3f3f3f;
const int mod = 1000000007;
vector<string> v[1000005];
int main() {
std::ios::sync_with_stdio(false);
int cnt[4];
for (int i = 0; i < 4; i++) cin >> cnt[i];
if (abs(cnt[2] - cnt[3]) > 1) {
puts("-1");
return 0;
}
string ans = "";
int n = cnt[0];
int ff = 0;
int posible = cnt[0] - 1;
int mini = min(cnt[2], cnt[3]);
int tmini = min(mini, posible);
if (posible > 0) {
for (int i = n - 1, j = 1; i >= 1, j <= tmini; i--, j++) {
v[i].push_back("7");
cnt[1]--;
}
cnt[2] -= tmini, cnt[3] -= tmini;
}
if (cnt[2] > 1 || cnt[3] > 1) {
puts("-1");
return 0;
}
if (cnt[2] == 1) {
v[n].push_back("7");
cnt[2] = 0;
cnt[1]--;
}
if (cnt[3] == 1) {
v[0].push_back("7");
cnt[3] = 0;
cnt[1]--;
}
if (cnt[1] < 0) {
puts("-1");
return 0;
}
if (cnt[1] > 0) {
int fff = 0;
for (int i = n; i >= 0; i--) {
if (v[i].size() > 0) {
fff = 1;
for (int j = 1; j <= cnt[1]; j++) v[i].push_back("7");
break;
}
}
if (fff == 0) {
puts("-1");
return 0;
}
}
for (int i = 1; i <= n; i++) {
for (int j = 0; j < v[i - 1].size(); j++) ans += v[i - 1][j];
ans += "4";
}
for (int j = 0; j < v[n].size(); j++) ans += v[n][j];
cout << ans << endl;
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int a, b, c, d, x, y, z;
cin >> a >> b >> c >> d;
if (a < c || b < c || a < d || b < d || abs(c - d) > 1) {
cout << "-1\n";
return 0;
}
string ans, temp;
x = a, y = b;
if (c > d) {
for (int i = 0; i < c; i++)
ans.push_back('4'), ans.push_back('7'), a--, b--;
if (a < 0 || b < 0) {
cout << "-1\n";
return 0;
}
while (a) temp.push_back('4'), a--;
while (b) ans.push_back('7'), b--;
ans = temp + ans;
} else if (d > c) {
for (int i = 0; i < d; i++)
ans.push_back('7'), ans.push_back('4'), a--, b--;
if (a < 0 || b < 0) {
cout << "-1\n";
return 0;
}
if (b) {
ans[ans.size() - 1] = '7', b--;
while (b) ans.push_back('7'), b--;
ans.push_back('4');
}
reverse(ans.begin(), ans.end());
if (a) {
ans[ans.size() - 1] = '4', a--;
while (a) ans.push_back('4'), a--;
ans.push_back('7');
}
reverse(ans.begin(), ans.end());
} else {
for (int i = 0; i < c; i++)
ans.push_back('4'), ans.push_back('7'), a--, b--;
ans.push_back('4'), a--;
if (a < 0 || b < 0) {
a = x, b = y;
ans.clear();
for (int i = 0; i < d; i++)
ans.push_back('7'), ans.push_back('4'), a--, b--;
ans.push_back('7'), b--;
if (a < 0 || b < 0) {
cout << "-1\n";
return 0;
}
while (b) ans.push_back('7'), b--;
reverse(ans.begin(), ans.end());
if (a) {
ans[ans.size() - 1] = '4', a--;
while (a) ans.push_back('4'), a--;
ans.push_back('7');
}
reverse(ans.begin(), ans.end());
}
if (b) {
ans[ans.size() - 1] = '7', b--;
while (b) ans.push_back('7'), b--;
ans.push_back('4');
}
while (a) temp.push_back('4'), a--;
ans = temp + ans;
}
cout << ans << "\n";
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
const int INF = 1e9 + 5;
const int MAXN = 1005;
const int MOD = 1e9 + 7;
const double eps = 1e-8;
const double PI = acos(-1.0);
long long gcd(long long a, long long b) { return b == 0 ? a : gcd(b, a % b); }
long long ppow(long long a, long long b) {
long long res = 1;
for (int i = 1; i <= b; i++) res *= a;
return res;
}
long long quick_mod(long long a, long long b, long long c) {
long long ans = 1;
while (b) {
if (b % 2 == 1) ans = (ans * a) % c;
b /= 2;
a = (a * a) % c;
}
return ans;
}
int main() {
int num4, num7, num47, num74;
scanf("%d%d%d%d", &num4, &num7, &num47, &num74);
if (abs(num47 - num74) >= 2) {
printf("-1\n");
return 0;
} else if (num47 == num74) {
if (num4 < 2 && num7 < 2) {
printf("-1\n");
return 0;
}
if (num4 > num47 && num7 >= num47) {
num4 = num4 - num47 - 1;
num7 = num7 - num47;
for (int i = 1; i <= num4; i++) printf("4");
for (int i = 1; i <= num47; i++) printf("47");
for (int i = 1; i <= num7; i++) printf("7");
printf("4\n");
return 0;
} else if (num7 > num47 && num4 >= num47) {
num7 = num7 - 1 - num47;
printf("7");
for (int i = 1; i <= num47; i++) printf("47");
for (int i = 1; i <= num7; i++) printf("7");
printf("\n");
return 0;
} else {
printf("-1\n");
return 0;
}
} else if (num47 > num74) {
num4 = num4 - num47;
num7 = num7 - num47;
if (num4 < 0 || num7 < 0) {
printf("-1\n");
return 0;
}
for (int i = 1; i <= num4; i++) printf("4");
for (int i = 1; i <= num47; i++) printf("47");
for (int i = 1; i <= num7; i++) printf("7");
printf("\n");
} else {
num4 = num4 - num74;
num7 = num7 - num74;
if (num4 < 0 || num7 < 0) {
printf("-1\n");
return 0;
}
printf("7");
for (int i = 1; i <= num4; i++) printf("4");
for (int i = 1; i <= num47; i++) printf("47");
for (int i = 1; i <= num7; i++) printf("7");
printf("4\n");
}
}
|
#include <bits/stdc++.h>
using namespace std;
int a[4];
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cin >> a[0] >> a[1] >> a[2] >> a[3];
if (a[0] < a[2] || a[1] < a[3] || max(a[2], a[3]) - min(a[2], a[3]) > 1)
cout << -1;
else {
if (a[2] == a[3]) {
if (a[0] == a[2]) {
if (a[1] == a[2]) {
cout << -1;
} else {
for (int i = 0; i < a[3]; ++i) cout << "74";
for (int i = a[3]; i < a[1]; ++i) cout << "7";
}
} else if (a[0] > a[2]) {
for (int i = a[2] + 1; i < a[0]; ++i) cout << "4";
for (int i = 0; i < a[2]; ++i) cout << "47";
for (int i = a[3]; i < a[1]; ++i) cout << "7";
cout << "4";
}
} else if (a[2] > a[3]) {
if (a[1] == a[3])
cout << -1;
else {
for (int i = a[2]; i < a[0]; ++i) cout << "4";
for (int i = 0; i < a[2]; ++i) cout << "47";
for (int i = a[2]; i < a[1]; ++i) cout << "7";
}
} else {
if (a[0] == a[2])
cout << -1;
else {
cout << "7";
for (int i = a[2]; i < a[0]; ++i) cout << "4";
for (int i = 2; i < a[3]; ++i) cout << "74";
for (int i = a[3] - 1; i < a[1]; ++i) cout << "7";
cout << "4";
}
}
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int n4, n7, n47, n74;
list<string> res;
list<string>::iterator it;
cin >> n4 >> n7 >> n47 >> n74;
if (abs(n47 - n74) > 1) {
cout << "-1" << endl;
return 0;
}
it = res.end();
if (n74 > n47) {
for (int i = 0; i < n74; i++) {
res.insert(it, 1, "7");
res.insert(it, 1, "4");
}
n47 -= n74 - 1;
n4 -= n74;
n7 -= n74;
n74 = 0;
} else {
for (int i = 0; i < n47; i++) {
res.insert(it, 1, "4");
res.insert(it, 1, "7");
}
n74 -= n47 - 1;
n4 -= n47;
n7 -= n47;
n47 = 0;
}
if (n4 < 0 || n7 < 0) {
cout << "-1" << endl;
return 0;
}
if (n74) {
if (n4) {
it = res.end();
res.insert(it, 1, "4");
n4--;
} else {
if (n7) {
it = res.begin();
res.insert(it, 1, "7");
n7--;
} else {
cout << "-1" << endl;
return 0;
}
}
}
bool flag = true;
for (it = res.begin(); it != res.end() && flag; it++) {
if ((*it) == "4") {
res.insert(it, n4, "4");
flag = false;
}
}
flag = true;
res.reverse();
for (it = res.begin(); it != res.end() && flag; it++) {
if ((*it) == "7") {
res.insert(it, n7, "7");
flag = false;
}
}
res.reverse();
for (it = res.begin(); it != res.end(); it++) cout << *it;
cout << endl;
}
|
#include <bits/stdc++.h>
int main() {
int a1, a2, a3, a4;
int i;
scanf("%d %d %d %d", &a1, &a2, &a3, &a4);
if (a3 - a4 > 1 || a4 - a3 > 1) {
printf("-1");
return 0;
}
if (a3 > a4) {
if (a2 < a3 || a1 < a3) {
printf("-1");
return 0;
}
a2 -= a3;
a1 -= a3;
for (i = 0; i < a1; i++) {
printf("4");
}
for (i = 0; i < a3; i++) {
printf("47");
}
for (i = 0; i < a2; i++) {
printf("7");
}
} else if (a4 > a3) {
if (a2 < a4 || a1 < a4) {
printf("-1");
return 0;
}
a2 -= a4;
a1 -= a4;
a4 -= 2;
printf("74");
for (i = 0; i < a1; i++) {
printf("4");
}
for (i = 0; i < a4; i++) {
printf("74");
}
for (i = 0; i < a2; i++) {
printf("7");
}
printf("74");
} else {
if (a2 < a3 || a1 < a3) {
printf("-1");
return 0;
}
if (a2 == a3 && a1 == a3) {
printf("-1");
return 0;
}
if (a1 > a3) {
a1 -= a3;
a1--;
a2 -= a3;
for (i = 0; i < a1; i++) {
printf("4");
}
for (i = 0; i < a3; i++) {
printf("47");
}
for (i = 0; i < a2; i++) {
printf("7");
}
printf("4");
} else {
a2 -= a3;
for (i = 0; i < a3; i++) {
printf("74");
}
for (i = 0; i < a2; i++) {
printf("7");
}
}
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
stringstream str;
void print(int k, const char* s) {
for (int i = 0; i < k; i++) str << s;
}
int n;
int a1, a2, a3, a4;
int b1, b2, b3, b4;
void calcB(string s) {
b1 = b2 = b3 = b4 = 0;
for (int i = 0; i < s.size(); i++) {
if (s[i] == '4') b1++;
if (s[i] == '7') b2++;
if (s[i] == '4' && i + 1 < n && s[i + 1] == '7') b3++;
if (s[i] == '7' && i + 1 < n && s[i + 1] == '4') b4++;
}
}
int main() {
cin >> a1 >> a2 >> a3 >> a4;
n = a1 + a2;
if (!a1) {
print(n, "7");
} else if (!a2) {
print(n, "4");
} else if (a3 == 0 && a4 == 1) {
print(a2, "7");
print(a1, "4");
} else if (a3 == 1 && a4 == 0) {
print(a1, "4");
print(a2, "7");
} else if (a3 == a4 + 1) {
print(a1 - a3, "4");
print(a3, "47");
print(a2 - a3, "7");
} else if (a3 == a4) {
if (a1 > a3) {
print(a1 - a3 - 1, "4");
print(a3, "47");
print(a2 - a3, "7");
print(1, "4");
} else {
print(1, "7");
print(a3, "47");
print(a2 - a3 - 1, "7");
}
} else if (a3 == a4 - 1) {
print(1, "7");
print(a1 - a3 - 1, "4");
print(a3, "47");
print(a2 - 1 - a3, "7");
print(1, "4");
}
string ans = str.str();
calcB(ans);
if (ans.size() == n && a1 == b1 && a2 == b2 && a3 == b3 && a4 == b4)
cout << ans;
else
cout << -1;
cout << '\n';
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
long long oup[2001000];
signed main() {
long long a, b, c, d;
cin >> a >> b >> c >> d;
if (abs(c - d) > 1) {
cout << "-1";
return 0;
}
long long sum;
long long pos4;
long long pos7;
if (c > d) {
if (a < c || b < c) {
cout << "-1";
return 0;
}
sum = c * 2;
a -= c;
b -= c;
pos4 = 1;
pos7 = c * 2;
for (int i = 1; i <= c * 2; i++) {
if (i % 2 == 1) {
oup[i] = 4;
} else {
oup[i] = 7;
}
}
} else if (c < d) {
if (a < d || b < d) {
cout << "-1";
return 0;
}
sum = d * 2;
a -= d;
b -= d;
pos4 = 2;
pos7 = d * 2 - 1;
for (int i = 1; i <= d * 2; i++) {
if (i % 2 == 1) {
oup[i] = 7;
} else {
oup[i] = 4;
}
}
} else if (c == d) {
sum = c * 2 + 1;
if (a > c) {
a -= c + 1;
b -= c;
pos4 = 1;
pos7 = c * 2;
for (int i = 1; i <= c * 2 + 1; i++) {
if (i % 2 == 1) {
oup[i] = 4;
} else {
oup[i] = 7;
}
}
} else if (b > c) {
a -= c;
b -= c + 1;
pos4 = 2;
pos7 = c * 2 + 1;
for (int i = 1; i <= c * 2 + 1; i++) {
if (i % 2 == 1) {
oup[i] = 7;
} else {
oup[i] = 4;
}
}
} else {
cout << "-1";
return 0;
}
}
if (a < 0 || b < 0) {
cout << "-1";
return 0;
}
for (int i = 1; i <= sum; i++) {
cout << oup[i];
if (i == pos4) {
while (a--) {
cout << "4";
}
}
if (i == pos7) {
while (b--) {
cout << "7";
}
}
}
}
|
#include <bits/stdc++.h>
int a1, a2, a3, a4;
int main() {
scanf("%d%d%d%d", &a1, &a2, &a3, &a4);
a4 -= a3 - 1;
a2 -= a3;
a1 -= a3;
int mark = 0;
if (a4 == 2) {
a1--;
a2--;
mark = 3;
} else if (a4 == 1) {
if (a1) {
a1--;
mark = 1;
} else {
a2--;
mark = 2;
}
}
if (a1 < 0 || a2 < 0 || a4 > 2 || a4 < 0)
puts("-1");
else {
if (mark & 2) printf("7");
for (int i = 1; i <= a1; ++i) printf("4");
for (int i = 1; i <= a3; ++i) printf("47");
for (int i = 1; i <= a2; ++i) printf("7");
if (mark & 1) printf("4");
}
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
long long int a1, a2, a3, a4, i;
cin >> a1 >> a2 >> a3 >> a4;
string str, str1 = "47", str2 = "74";
if ((abs(a3 - a4)) >= 2) {
cout << "-1";
} else if (a3 == a4) {
if (a1 >= a3 + 1 && a2 >= a3 + 1) {
str.append(a1 - a3 - 1, '4');
for (i = 0; i < a3; i++) {
str += str1;
}
str.append(a2 - a3 - 1, '7');
str += str2;
cout << str;
} else if (a1 >= a3 + 1 && a2 == a3) {
str.append(a1 - a3 - 1, '4');
for (i = 0; i < a3; i++) {
str += str1;
}
str.append("4");
cout << str;
} else if (a2 >= a3 + 1 && a1 == a3) {
for (i = 0; i < a3; i++) {
str += str2;
}
str.append(a2 - a3, '7');
cout << str;
} else {
cout << "-1";
}
} else if (a3 > a4) {
if (a1 >= a3 && a2 >= a3) {
str.append(a1 - a3, '4');
for (i = 0; i < a3; i++) {
str += str1;
}
str.append(a2 - a3, '7');
cout << str;
} else {
cout << "-1";
}
} else if (a4 > a3) {
if (a1 >= a4 && a2 >= a4) {
str += str2;
str.append(a1 - a4, '4');
for (i = 0; i < a4 - 2; i++) {
str += str2;
}
str.append(a2 - a4, '7');
str += str2;
cout << str;
} else {
cout << "-1";
}
}
}
|
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ii = pair<int, int>;
using pll = pair<ll, ll>;
int a1, a2, a3, a4;
string s;
void append(string r, int times) {
while (times--) s += r;
}
bool solve() {
if (abs(a3 - a4) > 1) return false;
if (a3 == a4 + 1) {
if (min(a1 - 1, a2 - 1) < a4) return false;
append("4", a1 - a4);
append("74", a4);
append("7", a2 - a4);
} else if (a3 + 1 == a4) {
if (min(a1 - 1, a2 - 1) < a3) return false;
append("7", 1);
append("4", a1 - a3);
append("74", a3 - 1);
append("7", a2 - a3);
append("4", 1);
} else {
if (min(a1 - 2, a2 - 1) >= a4 - 1) {
append("4", a1 - a4);
append("74", a4 - 1);
append("7", a2 - a4 + 1);
append("4", 1);
} else if (min(a1, a2 - 1) >= a4) {
append("74", a4);
append("4", a1 - a4);
append("7", a2 - a4);
} else
return false;
}
return true;
}
int main() {
scanf("%d%d%d%d", &a1, &a2, &a3, &a4);
if (solve())
printf("%s\n", s.c_str());
else
printf("-1\n");
}
|
#include <bits/stdc++.h>
using namespace std;
void r1() {
printf("-1");
return;
}
void r2(string rr) {
printf("%s\n", rr.c_str());
return;
}
int main() {
string ret;
int i;
int a1, a2, a3, a4;
scanf("%d %d %d %d", &a1, &a2, &a3, &a4);
if (abs(a3 - a4) > 1) {
r1();
return 0;
}
if (a3 == a4) {
if (a1 > a3 && a2 >= a4) {
for (i = 1; i <= a1 - a3 - 1; i++) ret += '4';
for (i = 1; i <= a3; i++) ret += "47";
for (i = 1; i <= a2 - a4; i++) ret += '7';
ret += '4';
r2(ret);
return 0;
} else if (a1 >= a3 && a2 > a4) {
ret += '7';
for (i = 1; i <= a1 - a3; i++) ret += '4';
for (i = 1; i <= a3; i++) ret += "47";
for (i = 1; i <= a2 - a4 - 1; i++) ret += '7';
r2(ret);
return 0;
} else {
r1();
return 0;
}
}
if (a4 > a3) {
if (a1 >= a4 && a2 >= a4) {
string tmp, s4, s7;
for (i = 1; i <= a4; i++) tmp += "74";
for (i = 1; i <= a1 - a4; i++) s4 += '4';
for (i = 1; i <= a2 - a4; i++) s7 += '7';
ret = tmp.substr(0, 2) + s4 + tmp.substr(2, tmp.size() - 3) + s7 + '4';
r2(ret);
return 0;
} else {
r1();
return 0;
}
}
if (a3 > a4) {
if (a1 >= a3 && a2 >= a3) {
for (i = 1; i <= a1 - a3; i++) ret += '4';
for (i = 1; i <= a3; i++) ret += "47";
for (i = 1; i <= a2 - a3; i++) ret += '7';
r2(ret);
return 0;
} else {
r1();
return 0;
}
}
}
|
#include <bits/stdc++.h>
using namespace std;
int i, j, r, st;
int a[4];
char c[] = {'4', '7'};
int main() {
for (i = 0; i < 4; i++) scanf("%d", &a[i]);
st = 1;
if (a[2] > a[3] || a[2] == a[3] && a[0] > a[2]) st = 0;
r = max(a[2], a[3]);
a[0] -= r;
a[1] -= r;
a[st] -= a[2] == a[3];
if (a[0] < 0 || a[1] < 0 || abs(a[2] - a[3]) > 1) {
printf("-1\n");
return 0;
}
for (i = 0; i < r; i++) {
printf("%c", c[st]);
if (c[st] == '4' && a[0]) {
for (j = 0; j < a[0]; j++) printf("4");
a[0] = 0;
}
if (c[st] == '7' && i == r - 1 && (a[2] != a[3] || !st) && a[1]) {
for (j = 0; j < a[1]; j++) printf("7");
a[1] = 0;
}
printf("%c", c[(st + 1) % 2]);
if (c[(st + 1) % 2] == '4' && a[0]) {
for (j = 0; j < a[0]; j++) printf("4");
a[0] = 0;
}
}
for (j = 0; j < a[(st + 1) % 2]; j++) printf("%c", c[(st + 1) % 2]);
for (j = 0; j < a[st]; j++) printf("%c", c[st]);
if (a[2] == a[3]) printf("%c", c[st]);
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
void boost() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
}
const int N = 1e6;
int a1, a2, a3, a4, b1, b2;
string ans;
int main() {
boost();
cin >> a1 >> a2 >> a3 >> a4;
if (abs(a3 - a4) > 1) {
cout << -1;
return 0;
}
if (a4 > a3) {
for (int i = 1; i <= a4; i++) {
ans += "74";
b1++;
b2++;
}
if (b1 <= a1 && b2 <= a2) {
b1 = a1 - b1;
b2 = a2 - b2;
cout << ans[0];
for (int i = 1; i <= b1; i++) {
cout << 4;
}
for (int i = 1; i < ans.size() - 1; i++) {
cout << ans[i];
}
for (int i = 1; i <= b2; i++) {
cout << 7;
}
cout << ans[ans.size() - 1];
return 0;
} else {
cout << -1;
return 0;
}
} else if (a3 > a4) {
for (int i = 1; i <= a3; i++) {
ans += "47";
b1++;
b2++;
}
if (b1 <= a1 && b2 <= a2) {
b1 = a1 - b1;
b2 = a2 - b2;
for (int i = 1; i <= b1; i++) {
cout << 4;
}
for (int i = 0; i < ans.size(); i++) {
cout << ans[i];
}
for (int i = 1; i <= b2; i++) {
cout << 7;
}
return 0;
} else {
cout << -1;
return 0;
}
} else {
ans += '4';
b1++;
for (int i = 1; i <= a4; i++) {
ans += "74";
b1++;
b2++;
}
if (b1 <= a1 && b2 <= a2) {
b1 = a1 - b1;
b2 = a2 - b2;
for (int i = 1; i <= b1; i++) {
cout << 4;
}
for (int i = 0; i < ans.size() - 1; i++) {
cout << ans[i];
}
for (int i = 1; i <= b2; i++) {
cout << 7;
}
cout << ans[ans.size() - 1];
return 0;
}
ans = "";
b1 = 0;
b2 = 1;
ans += "7";
for (int i = 1; i <= a4; i++) {
ans += "47";
b1++;
b2++;
}
if (b1 <= a1 && b2 <= a2) {
b1 = a1 - b1;
b2 = a2 - b2;
cout << ans[0];
for (int i = 1; i <= b1; i++) {
cout << 4;
}
for (int i = 1; i < ans.size(); i++) {
cout << ans[i];
}
for (int i = 1; i <= b2; i++) {
cout << 7;
}
return 0;
}
}
cout << -1;
}
|
#include <bits/stdc++.h>
using namespace std;
string INF;
string Finalize(string str, int A4, int A7) {
bool is7 = 0;
string ret;
for (int j = str.length() - 1; j >= 0; j--) {
ret.push_back(str[j]);
if (str[j] == '7' && !is7) {
while (A7--) ret += "7";
is7 = 1;
}
if (str[j] == '4' && j <= 1)
while (A4--) ret += "4";
}
reverse(ret.begin(), ret.end());
return ret;
}
string TRY47(int A4, int A7, int A47, int A74) {
string ans, ret;
for (int j = 1; j <= A47; j++) {
ans += "47";
A4--;
A7--;
}
A74++;
A74 -= A47;
A47 = 0;
if (A74) {
ans += "4";
A74--;
A4--;
}
if (A4 < 0 || A7 < 0 || A74 > 0) return INF;
return Finalize(ans, A4, A7);
}
string TRY74(int A4, int A7, int A47, int A74) {
string ans, ret;
for (int j = 1; j <= A74; j++) {
ans += "74";
A4--;
A7--;
}
A47++;
A47 -= A74;
A74 = 0;
if (A47) {
ans += "7";
A47--;
A7--;
}
if (A4 < 0 || A7 < 0 || A47 > 0) return INF;
return Finalize(ans, A4, A7);
}
int A4, A7, A47, A74;
string ans;
int main() {
cin >> A4 >> A7 >> A47 >> A74;
if (abs(A47 - A74) > 1) {
puts("-1");
return 0;
}
for (int j = 1; j <= A4 + A7 + 10; j++) INF += "9";
string ans47 = TRY47(A4, A7, A47, A74);
string ans74 = TRY74(A4, A7, A47, A74);
if (ans47.length() < ans74.length() ||
(ans47.length() == ans74.length() && ans47.compare(ans74) < 1))
ans = ans47;
else
ans = ans74;
if (ans == INF)
puts("-1");
else
cout << ans << endl;
}
|
#include <bits/stdc++.h>
int a, b, c, d, p;
int main() {
scanf("%d%d%d%d", &a, &b, &c, &d);
a -= c;
b -= c;
d -= c - 1;
p = 0;
if (d == 2) a--, b--, p = 3;
if (d == 1)
if (a)
a--, p = 1;
else
b--, p = 2;
if (a < 0 || b < 0 || d > 2 || d < 0) return puts("-1");
if (p & 2) printf("7");
for (int i = 0; i < a; i++) printf("4");
for (int i = 0; i < c; i++) printf("47");
for (int i = 0; i < b; i++) printf("7");
if (p & 1) printf("4");
printf("\n");
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int cnt4, cnt7, cnt47, cnt74;
int main() {
ios::sync_with_stdio(false);
cin >> cnt4 >> cnt7 >> cnt47 >> cnt74;
if (abs(cnt47 - cnt74) > 1) {
puts("-1");
return 0;
}
string ans;
if (cnt47 < cnt74) {
assert(cnt47 + 1 == cnt74);
while (cnt74--) ans += "74", cnt4--, cnt7--;
} else if (cnt47 > cnt74) {
assert(cnt47 == cnt74 + 1);
while (cnt47--) ans += "47", cnt4--, cnt7--;
} else {
assert(cnt47 == cnt74);
while (cnt47--) ans += "47", cnt4--, cnt7--;
if (cnt4 > 0)
ans.push_back('4'), cnt4--;
else {
if (cnt7 <= 0) {
puts("-1");
return 0;
}
ans = '7' + ans;
cnt7--;
}
}
if (cnt4 < 0 || cnt7 < 0) {
puts("-1");
return 0;
}
int pos4 = -1, pos7 = -1;
for (int i = 0; i < ans.size(); i++) {
if (ans[i] == '4' && pos4 == -1) pos4 = i;
if (ans[i] == '7') pos7 = i;
}
if (pos4 != -1) ans.insert(pos4, cnt4, '4');
if (pos7 != -1) ans.insert(cnt4 + pos7, cnt7, '7');
cout << ans << '\n';
}
|
#include <bits/stdc++.h>
using namespace std;
long long int binpow(long long int a, long long int b) {
long long int res = 1;
while (b > 0) {
if (b & 1) res = (res * a);
a = (a * a);
b >>= 1;
}
return res;
}
long long int gcd(long long int a, long long int b) {
if (b % a == 0) return a;
return gcd(b % a, a);
}
int32_t main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
long long int j, i, n, t, l, a, b, r, c, h, k, m, maxi, d, x;
cin >> a >> b >> c >> d;
if (abs(c - d) > 1) {
cout << -1;
return 0;
}
if (c > d) {
if (a < c || b < c) {
cout << -1;
return 0;
}
while (a - c != 0) {
cout << "4";
a--;
}
for (j = 0; j < c; j++) {
cout << "47";
}
while (b - c != 0) {
cout << "7";
b--;
}
} else if (c == d) {
if (a - c - 1 < 0 || b < c) {
if (b - c - 1 < 0 || a < c) {
cout << -1;
return 0;
}
cout << "74";
c--;
while (a - c - 1 != 0) {
cout << 4;
a--;
}
for (j = 0; j < c; j++) cout << "74";
while (b - c - 1 != 0) {
cout << 7;
b--;
}
return 0;
}
while (a - c - 1 != 0) {
cout << 4;
a--;
}
for (j = 0; j < c; j++) cout << "47";
while (b - c != 0) {
cout << "7";
b--;
}
cout << "4";
} else {
if (a < d || b < d) {
cout << -1;
return 0;
}
cout << "74";
d--;
while (a - d - 1 != 0) {
cout << "4";
a--;
}
for (j = 0; j < d - 1; j++) cout << "74";
while (b - d - 1 != 0) {
cout << "7";
b--;
}
cout << "74";
}
cerr << '\n'
<< "Time elapsed :" << clock() * 1000.0 / CLOCKS_PER_SEC << " ms\n";
}
|
#include <bits/stdc++.h>
using namespace std;
const long long N = 2e2 + 5, K = 20, mod = 1000000007, MOD = 1000000007,
INF = LLONG_MAX / 2;
void solve() {
long long a, b, c, d;
cin >> a >> b >> c >> d;
string s;
if (abs(c - d) > 1) {
cout << -1 << endl;
return;
}
string prev, suff;
if (c <= d) {
for (long long i = 0; i < c; i++) s += "47";
long long f = c, sv = c;
if (d - c && (a - f <= 0 || b - sv <= 0)) {
cout << -1 << endl;
return;
}
if (c == d && (a - f == 0 && b - sv == 0)) {
cout << -1 << endl;
return;
}
if (a < f || b < sv) {
cout << -1 << endl;
return;
}
if (d - c) {
prev = "";
while (f < a - 1) {
f++;
prev += '4';
}
s = prev + s;
suff = "";
while (sv < b - 1) {
sv++;
suff += '7';
}
s += suff;
s = '7' + s + '4';
} else {
if (a - f) {
suff = "";
while (sv < b) {
sv++;
suff += '7';
}
s += suff;
s += '4';
f++;
prev = "";
while (f < a) {
prev += '4';
f++;
}
s = prev + s;
} else {
suff = "";
while (sv < b - 1) {
sv++;
suff += '7';
}
s += suff;
s = '7' + s;
}
}
} else {
for (long long i = 0; i < d; i++) s += "74";
long long f = d, sv = d;
if (a - f <= 0 || b - sv <= 0) {
cout << -1 << endl;
return;
}
suff = "";
while (sv < b) {
sv++;
suff += '7';
}
s = s + suff;
prev = "";
while (f < a) {
f++;
prev += '4';
}
s = prev + s;
}
cout << s << endl;
}
int32_t main() {
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
;
long long TESTS = 1;
while (TESTS--) {
solve();
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(NULL);
int a1, a2, a3, a4;
cin >> a1 >> a2 >> a3 >> a4;
if (abs(a3 - a4) > 1) {
cout << -1;
return 0;
}
list<char> s;
list<char> s2;
if (a3 < a4) {
for (int i = 0; i < a4; i++) {
s.push_back('7');
s.push_back('4');
}
int sevens = 0;
int fours = 0;
for (list<char>::iterator it = s.begin(); it != s.end(); ++it) {
if (*it == '4') {
fours++;
} else {
sevens++;
}
}
if (fours > a1 || sevens > a2) {
cout << -1;
return 0;
}
for (list<char>::iterator it = s.begin(); it != s.end(); ++it) {
if (*it == '4') {
for (int j = 0; j < a1 - fours; j++) {
s.insert(it, '4');
}
break;
}
}
for (list<char>::iterator it = (--s.end()); it != s.begin(); --it) {
if (*it == '7') {
for (int j = 0; j < a2 - sevens; j++) {
s.insert(it, '7');
}
break;
}
}
} else if (a3 == a4) {
for (int i = 0; i < a3; i++) {
s.push_back('4');
s.push_back('7');
}
s.push_back('4');
list<char> s2;
for (int i = 0; i < a3; i++) {
s2.push_back('7');
s2.push_back('4');
}
s2.push_back('7');
int sevens = 0;
int fours = 0;
for (list<char>::iterator it = s.begin(); it != s.end(); ++it) {
if (*it == '4') {
fours++;
} else {
sevens++;
}
}
int sevens2 = 0;
int fours2 = 0;
for (list<char>::iterator it = s2.begin(); it != s2.end(); ++it) {
if (*it == '4') {
fours2++;
} else {
sevens2++;
}
}
if ((fours > a1 || sevens > a2) && (fours2 > a1 || sevens2 > a2)) {
cout << -1;
return 0;
} else {
if (!(fours > a1 || sevens > a2)) {
for (list<char>::iterator it = s.begin(); it != s.end(); ++it) {
if (*it == '4') {
for (int j = 0; j < a1 - fours; j++) {
s.insert(it, '4');
}
break;
}
}
for (list<char>::iterator it = (--s.end()); it != s.begin(); --it) {
if (*it == '7') {
for (int j = 0; j < a2 - sevens; j++) {
s.insert(it, '7');
}
break;
}
}
for (list<char>::iterator it = s.begin(); it != s.end(); ++it) {
cout << *it;
}
return 0;
} else if (!(fours2 > a1 || sevens2 > a2)) {
for (list<char>::iterator it = s2.begin(); it != s2.end(); ++it) {
if (*it == '4') {
for (int j = 0; j < a1 - fours2; j++) {
s2.insert(it, '4');
}
break;
}
}
for (list<char>::iterator it = (--s2.end()); it != s2.begin(); --it) {
if (*it == '7') {
for (int j = 0; j < a2 - sevens2; j++) {
s2.insert(it, '7');
}
break;
}
}
for (list<char>::iterator it = s2.begin(); it != s2.end(); ++it) {
cout << *it;
}
return 0;
} else {
cout << -1;
return 0;
}
}
} else {
for (int i = 0; i < a3; i++) {
s.push_back('4');
s.push_back('7');
}
int sevens = 0;
int fours = 0;
for (list<char>::iterator it = s.begin(); it != s.end(); ++it) {
if (*it == '4') {
fours++;
} else {
sevens++;
}
}
if (fours > a1 || sevens > a2) {
cout << -1;
return 0;
}
for (list<char>::iterator it = s.begin(); it != s.end(); ++it) {
if (*it == '4') {
for (int j = 0; j < a1 - fours; j++) {
s.insert(it, '4');
}
break;
}
}
for (list<char>::iterator it = (--s.end()); it != s.begin(); --it) {
if (*it == '7') {
for (int j = 0; j < a2 - sevens; j++) {
s.insert(it, '7');
}
break;
}
}
}
for (list<char>::iterator it = s.begin(); it != s.end(); ++it) {
cout << *it;
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int a1, a2, a3, a4;
while (scanf("%d %d %d %d", &a1, &a2, &a3, &a4) != EOF) {
if (a1 - a3 < 0 || a2 - a3 < 0 || a1 - a4 < 0 || a2 - a4 < 0) {
printf("-1\n");
return 0;
}
if (a3 >= a4) {
if (a4 < a3 - 1) {
printf("-1\n");
return 0;
} else if (a4 == a3 - 1) {
if (a1 - a3 >= 0 && a2 - a3 >= 0) {
for (int i = 0; i < a1 - a3; i++) printf("4");
for (int i = 0; i < a3; i++) printf("47");
for (int i = 0; i < a2 - a3; i++) printf("7");
printf("\n");
} else
printf("-1\n");
} else if (a3 == a4 && a3 != 0) {
if (a1 - a3 > 0 && a2 - a3 >= 0) {
for (int i = 0; i < a1 - a3 - 1; i++) printf("4");
for (int i = 0; i < a3; i++) printf("47");
for (int i = 0; i < a2 - a3; i++) printf("7");
printf("4");
printf("\n");
} else if (a1 - a3 == 0 && a2 - a3 > 0) {
printf("7");
for (int i = 0; i < a1 - a3; i++) printf("4");
for (int i = 0; i < a3; i++) printf("47");
for (int i = 0; i < a2 - a3 - 1; i++) printf("7");
printf("\n");
} else
printf("-1\n");
} else
printf("-1\n");
} else {
if (a3 < a4 - 1) {
printf("-1\n");
} else {
if (a4 > 1 && a1 - a4 >= 0 && a2 - a4 >= 0) {
printf("7");
for (int i = 0; i < a1 - a4 + 1; i++) printf("4");
for (int i = 0; i < a4 - 2; i++) printf("74");
if (a4 > 1) printf("7");
for (int i = 0; i < a2 - a4; i++) printf("7");
if (a4 > 1) printf("4\n");
} else if (a1 - a4 >= 0 && a2 - a4 >= 0) {
for (int i = 0; i < a2; i++) printf("7");
for (int i = 0; i < a2 - a4 + 1; i++) printf("4");
printf("\n");
} else
printf("-1\n");
}
}
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
std::string solve(int a, int b, int c, int d) {
std::string res;
int i, j;
int r = min(c, d);
a -= r, b -= r;
switch (c - d) {
case -1:
if (a <= 0 || b <= 0) {
break;
}
res += "7";
for (i = 1; i < a; ++i) {
res += "4";
}
for (i = 0; i < r; ++i) {
res += "47";
}
for (i = 1; i < b; ++i) {
res += "7";
}
res += "4";
break;
case 0:
if (a < 0 || b < 0) {
break;
}
if (a == 0) {
if (b == 0) {
break;
}
for (i = 0; i < r; ++i) {
res += "74";
}
for (i = 0; i < b; ++i) {
res += "7";
}
break;
}
for (i = 1; i < a; ++i) {
res += "4";
}
for (i = 0; i < r; ++i) {
res += "47";
}
for (i = 0; i < b; ++i) {
res += "7";
}
res += "4";
break;
case 1:
if (a <= 0 || b <= 0) {
break;
}
for (i = 1; i < a; ++i) {
res += "4";
}
for (i = 0; i < c; ++i) {
res += "47";
}
for (i = 1; i < b; ++i) {
res += "7";
}
break;
}
return res;
}
static bool Test(int a, int b, int c, int d, const char *expected) {
std::string res = solve(a, b, c, d);
std::string exp = expected;
if (exp.length() > 200) {
exp = exp.substr(0, 200);
}
bool passed = strcmp(expected, res.c_str()) == 0;
cout << "input: " << a << "," << b << "," << c << "," << d << ", result: ";
if (passed) {
cout << "PASSED, " << expected << endl;
} else {
cout << "FAILED, expected: " << expected << ", returned: " << res << endl;
}
return passed;
}
int main(int argc, char *argv[]) {
int a, b, c, d;
cin >> a >> b >> c >> d;
string ans = solve(a, b, c, d);
if (ans.empty()) {
ans = "-1";
}
cout << ans << endl;
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a1, a2, a3, a4;
int flag;
int main() {
while (scanf("%d%d%d%d", &a1, &a2, &a3, &a4) != EOF) {
int i, j;
if (a3 == a4 + 1) {
a1 -= a3;
a2 -= a3;
if (a1 < 0 || a2 < 0) {
cout << "-1" << endl;
continue;
}
for (i = 1; i <= a1; i++) cout << "4";
for (i = 1; i <= a3; i++) cout << "47";
for (i = 1; i <= a2; i++) cout << "7";
cout << endl;
} else if (a3 == a4 - 1) {
a1 -= a4;
a2 -= a4;
if (a1 < 0 || a2 < 0) {
cout << "-1" << endl;
continue;
}
cout << "7";
for (i = 1; i <= a1; i++) cout << "4";
for (i = 1; i <= a3; i++) cout << "47";
for (i = 1; i <= a2; i++) cout << "7";
cout << "4" << endl;
} else if (a3 == a4) {
if (a1 >= a3 + 1 && a2 >= a3) {
a1 = a1 - a3 - 1;
a2 = a2 - a3;
for (i = 1; i <= a1; i++) cout << "4";
for (i = 1; i <= a3; i++) cout << "47";
for (i = 1; i <= a2; i++) cout << "7";
cout << "4" << endl;
} else if (a1 >= a3 && a2 >= a3 + 1) {
a1 = a1 - a3;
a2 = a2 - a3 - 1;
cout << "7";
for (i = 1; i <= a1; i++) cout << "4";
for (i = 1; i <= a3; i++) cout << "47";
for (i = 1; i <= a2; i++) cout << "7";
cout << endl;
} else
cout << "-1" << endl;
} else
cout << "-1" << endl;
}
return 0;
}
|
#include <bits/stdc++.h>
int a1, a2, a3, a4;
int main() {
scanf("%d%d%d%d", &a1, &a2, &a3, &a4);
switch (a3 - a4) {
case 0:
if (a1 < a3 || a2 < a4 || (a1 <= a3 && a2 <= a4)) {
puts("-1");
break;
}
if (a1 > a3) {
putchar('4');
for (int i = 0; i < a1 - a3 - 1; ++i) putchar('4');
for (int i = 0; i < a3 - 1; ++i) fputs("74", stdout);
for (int i = 0; i < a2 - a3; ++i) putchar('7');
puts("74");
} else {
putchar('7');
for (int i = 0; i < a1 - a3; ++i) putchar('4');
for (int i = 0; i < a3; ++i) fputs("47", stdout);
for (int i = 0; i < a2 - a3 - 1; ++i) putchar('7');
putchar('\n');
}
break;
case +1:
if (a1 < a3 || a2 < a3) {
puts("-1");
break;
}
putchar('4');
for (int i = 0; i < a1 - a3; ++i) putchar('4');
putchar('7');
for (int i = 0; i < a3 - 1; ++i) fputs("47", stdout);
for (int i = 0; i < a2 - a3; ++i) putchar('7');
putchar('\n');
break;
case -1:
if (a1 < a4 || a2 < a4) {
puts("-1");
break;
}
putchar('7');
putchar('4');
for (int i = 0; i < a1 - a4; ++i) putchar('4');
for (int i = 0; i < a4 - 2; ++i) fputs("74", stdout);
putchar('7');
for (int i = 0; i < a2 - a4; ++i) putchar('7');
putchar('4');
putchar('\n');
break;
default:
puts("-1");
break;
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
long long ans = 2000000000000000005;
void solve() {
long long a, b, c, d;
cin >> a >> b >> c >> d;
if (abs(c - d) > 1) {
cout << "-1"
<< "\n";
return;
}
string ans;
if (c > d)
ans += '4';
else if (c < d)
ans += '7';
if (c == d) {
if (c < a)
ans += '4';
else
ans += '7';
}
while (c != 0 || d != 0) {
if (ans[ans.length() - 1] == '4') {
c--;
ans += '7';
} else {
d--;
ans += '4';
}
}
for (long long i = 0; i < ans.length(); i++) {
if (ans[i] == '4')
a--;
else
b--;
}
if (a < 0 || b < 0) {
cout << "-1"
<< "\n";
return;
}
long long aa = 0;
long long bb = 0;
for (long long i = 0; i < ans.length(); i++) {
if (ans[i] == '7') bb = i;
}
for (long long i = 0; i < ans.length(); i++) {
if (ans[i] == '4') {
aa = i;
break;
}
}
for (long long i = 0; i < ans.length(); i++) {
if (ans[i] == '4') {
cout << ans[i];
if (aa == i) {
aa = 1;
for (long long j = 0; j < a; j++) cout << '4';
}
}
if (ans[i] == '7') {
cout << ans[i];
if (bb == i) {
bb = 1;
for (long long j = 0; j < b; j++) cout << '7';
}
}
}
cout << "\n";
}
signed main() {
ios_base ::sync_with_stdio(0);
cin.tie(NULL);
cout.tie(NULL);
solve();
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
void err() {
printf("-1\n");
exit(0);
}
int main() {
int a, b, c, d;
scanf("%d%d%d%d", &a, &b, &c, &d);
if (c == d) {
if (a < c || b < c || (a <= c && b <= c)) err();
if (a > c) {
printf("%s", string(a - c, '4').c_str());
for (int i = 0; i < c - 1; i++) printf("74");
printf("%s4\n", string(b - c + 1, '7').c_str());
} else {
printf("7%s", string(a - c + 1, '4').c_str());
for (int i = 0; i < c - 1; i++) printf("74");
printf("%s\n", string(b - c, '7').c_str());
}
} else if (c == d + 1) {
if (a < c || b < c) err();
printf("%s", string(a - c + 1, '4').c_str());
for (int i = 0; i < c - 1; i++) printf("74");
printf("%s\n", string(b - c + 1, '7').c_str());
} else if (c + 1 == d) {
if (a < d || b < d) err();
printf("7%s", string(a - d + 1, '4').c_str());
for (int i = 0; i < d - 2; i++) printf("74");
printf("%s4\n", string(b - d + 1, '7').c_str());
} else {
err();
}
}
|
#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
struct custom_hash {
static uint64_t splitmix64(uint64_t x) {
x += 0x9e3779b97f4a7c15;
x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
return x ^ (x >> 31);
}
size_t operator()(uint64_t x) const {
static const uint64_t FIXED_RANDOM =
chrono::steady_clock::now().time_since_epoch().count();
return splitmix64(x + FIXED_RANDOM);
}
};
template <typename T, size_t N>
int SIZE(const T (&t)[N]) {
return N;
}
template <typename T>
int SIZE(const T &t) {
return t.size();
}
string to_string(const string s, int x1 = 0, int x2 = 1e9) {
return '"' + ((x1 < s.size()) ? s.substr(x1, x2 - x1 + 1) : "") + '"';
}
string to_string(const char *s) { return to_string((string)s); }
string to_string(const bool b) { return (b ? "true" : "false"); }
string to_string(const char c) { return string({c}); }
template <size_t N>
string to_string(const bitset<N> &b, int x1 = 0, int x2 = 1e9) {
string t = "";
for (int __iii__ = min(x1, SIZE(b)), __jjj__ = min(x2, SIZE(b) - 1);
__iii__ <= __jjj__; ++__iii__) {
t += b[__iii__] + '0';
}
return '"' + t + '"';
}
template <typename A, typename... C>
string to_string(const A(&v), int x1 = 0, int x2 = 1e9, C... coords);
int l_v_l_v_l = 0, t_a_b_s = 0;
template <typename A, typename B>
string to_string(const pair<A, B> &p) {
l_v_l_v_l++;
string res = "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
l_v_l_v_l--;
return res;
}
template <typename A, typename... C>
string to_string(const A(&v), int x1, int x2, C... coords) {
int rnk = rank<A>::value;
string tab(t_a_b_s, ' ');
string res = "";
bool first = true;
if (l_v_l_v_l == 0) res += '\n';
res += tab + "[";
x1 = min(x1, SIZE(v)), x2 = min(x2, SIZE(v));
auto l = begin(v);
advance(l, x1);
auto r = l;
advance(r, (x2 - x1) + (x2 < SIZE(v)));
for (auto e = l; e != r; e = next(e)) {
if (!first) {
res += ", ";
}
first = false;
l_v_l_v_l++;
if (e != l) {
if (rnk > 1) {
res += '\n';
t_a_b_s = l_v_l_v_l;
};
} else {
t_a_b_s = 0;
}
res += to_string(*e, coords...);
l_v_l_v_l--;
}
res += "]";
if (l_v_l_v_l == 0) res += '\n';
return res;
}
void dbgm() { ; }
template <typename Heads, typename... Tails>
void dbgm(Heads H, Tails... T) {
cout << to_string(H) << " | ";
dbgm(T...);
}
const int MOD = (int)1e9 + 7;
string ascii_lowercase = "abcdefghijklmnopqrstuvwxyz";
string ascii_uppercase = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
long long inv(long long a, long long b) {
return 1 < a ? b - inv(b % a, a) * b / a : 1;
}
const long long INF = 1e6;
unordered_map<int, int, custom_hash> mp;
unordered_map<int, unordered_map<int, int, custom_hash>, custom_hash> g;
long long gcd(long long a, long long b, long long &x, long long &y) {
if (a == 0) {
x = 0;
y = 1;
return b;
}
long long x1, y1;
long long d = gcd(b % a, a, x1, y1);
x = y1 - (b / a) * x1;
y = x1;
return d;
}
long long n, m;
map<int, vector<pair<int, int>>> diags;
map<int, vector<pair<int, int>>> adiags;
int main() {
int a, b, c, d;
cin >> a >> b >> c >> d;
vector<string> q;
if (c == 0 && d == 0) {
if (a > 0 && b > 0) {
puts("-1\n");
return 0;
} else if (a > 0) {
printf("%s\n", string(a, '4').c_str());
} else if (b > 0) {
printf("%s\n", string(b, '7').c_str());
}
printf("\n");
return 0;
}
if (abs(c - d) >= 2) {
puts("-1\n");
return 0;
}
if ((d == c && b > a && a == c) || d > c) {
int tmp = d;
b -= tmp;
a -= tmp;
c -= tmp - 1;
for (int i = 0; i < (tmp); i++) {
if (d == 1 && c == 0 && b > 0) {
q.push_back(string(b, '7'));
b = 0;
}
q.push_back("74");
if (a > 0) {
q.push_back(string(a, '4'));
a = 0;
}
d -= 1;
}
if (c > 0) {
q.push_back("7");
c -= 1;
b -= 1;
}
if (b > 0) q.push_back(string(b, '7'));
} else {
int tmp = c;
d -= tmp - 1;
c -= tmp;
a -= tmp;
b -= tmp;
for (int i = 0; i < (tmp); i++) {
q.push_back("47");
if (i == tmp - 1 && b > 0) q.push_back(string(b, '7'));
}
if (d > 0) {
q.push_back("4");
d -= 1;
a -= 1;
}
if (a > 0) q.insert(q.begin(), string(a, '4'));
}
if (a < 0 || b < 0 || c < 0 || d < 0) {
puts("-1\n");
return 0;
}
string ret;
for (const auto &z : q) ret += z;
printf("%s\n", ret.c_str());
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
const double PI = acos(-1);
struct str {
int a, b, c;
};
int main() {
int a, b, c, d, k;
cin >> a >> b >> c >> d;
if (c == d) {
if (min(a, b) - c < 0 || max(a, b) == c) {
cout << -1 << endl;
return 0;
}
if (a == c) {
cout << 7;
for (int i = 0; i < c; ++i) cout << 47;
k = b - c - 1;
while (k--) cout << 7;
cout << endl;
} else if (b == c) {
k = a - c;
while (k--) cout << 4;
for (int i = 0; i < c; ++i) cout << 74;
cout << endl;
} else {
k = a - c - 1;
while (k--) cout << 4;
for (int i = 0; i < c; ++i) cout << 47;
k = b - c - 1;
while (k--) cout << 7;
cout << 74 << endl;
}
return 0;
} else if (c == d + 1) {
if (a - c < 0 || b - c < 0) {
cout << -1 << endl;
return 0;
}
k = a - c;
while (k--) cout << 4;
for (int i = 0; i < c; ++i) cout << 47;
k = b - c;
while (k--) cout << 7;
cout << endl;
return 0;
} else if (c == d - 1) {
if (a - c - 1 < 0 || b - c - 1 < 0) {
cout << -1 << endl;
return 0;
}
cout << 7;
k = a - c - 1;
while (k--) cout << 4;
for (int i = 0; i < c; ++i) cout << 47;
k = b - c - 1;
while (k--) cout << 7;
cout << 4;
cout << endl;
return 0;
}
cout << -1 << endl;
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
bool f;
int n4, n7, n47, n74;
vector<char> ans;
vector<char> d;
int ABS(int aa) {
if (aa >= 0)
return aa;
else
return -aa;
}
bool solve() {
ans.clear();
d.clear();
if (ABS(n47 - n74) > 1) {
return false;
}
if (n47 == n74) {
if (n4 < n47 || n7 < n47 || n4 < n47 + 1 && n7 < n47 + 1) {
return false;
}
if (n4 >= n47 + 1) {
for (int i = 1; i <= n47; i++) {
ans.push_back('4');
ans.push_back('7');
}
ans.push_back('4');
for (int i = 0; i < ans.size(); i++) {
if (i == 0) {
for (int j = 1; j <= n4 - (n47 + 1); j++) {
d.push_back('4');
}
}
if (i == ans.size() - 2) {
for (int j = 1; j <= n7 - n47; j++) {
d.push_back('7');
}
}
d.push_back(ans[i]);
}
} else {
for (int i = 1; i <= n47; i++) {
ans.push_back('7');
ans.push_back('4');
}
ans.push_back('7');
for (int i = 0; i < ans.size(); i++) {
if (i == 1) {
for (int j = 1; j <= n4 - n47; j++) {
d.push_back('4');
}
}
if (i == ans.size() - 1) {
for (int j = 1; j <= n7 - (n47 + 1); j++) {
d.push_back('7');
}
}
d.push_back(ans[i]);
}
}
} else if (n47 > n74) {
if (n4 < n47 || n7 < n47) {
return false;
}
for (int i = 1; i <= n47; i++) {
ans.push_back('4');
ans.push_back('7');
}
for (int i = 0; i < ans.size(); i++) {
if (i == 0) {
for (int j = 1; j <= n4 - n47; j++) {
d.push_back('4');
}
}
if (i == ans.size() - 1) {
for (int j = 1; j <= n7 - n47; j++) {
d.push_back('7');
}
}
d.push_back(ans[i]);
}
} else if (n47 < n74) {
if (n4 < n74 || n7 < n74) {
return false;
}
for (int i = 1; i <= n74; i++) {
ans.push_back('7');
ans.push_back('4');
}
for (int i = 0; i < ans.size(); i++) {
if (i == 1) {
for (int j = 1; j <= n4 - n74; j++) {
d.push_back('4');
}
}
if (i == ans.size() - 2) {
for (int j = 1; j <= n7 - n74; j++) {
d.push_back('7');
}
}
d.push_back(ans[i]);
}
}
return true;
}
int main() {
scanf("%d%d%d%d", &n4, &n7, &n47, &n74);
f = solve();
if (f) {
for (int i = 0; i < d.size(); i++) {
printf("%c", d[i]);
}
printf("\n");
} else {
printf("-1\n");
}
getchar(), getchar();
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int x, y, a, b;
while (scanf("%d%d%d%d", &x, &y, &a, &b) == 4) {
if (a - b > 1 || a - b < -1) {
puts("-1");
continue;
}
if (min(x, y) < max(a, b)) {
puts("-1");
continue;
}
if (a == b && max(x, y) <= a) {
puts("-1");
continue;
}
int i;
int cot4, cot7, ret4, ret7;
if ((a < b) || (a == b && x <= a)) {
i = 1;
cot4 = b;
cot7 = a + 1;
} else {
i = 0;
cot4 = b + 1;
cot7 = a;
}
ret4 = x - cot4;
ret7 = y - cot7;
for (; i <= (x + y); i++) {
if (i & 1) {
if (cot7 > 0) {
putchar('7');
cot7--;
while (ret7 > 0 && (!cot7)) {
putchar('7');
ret7--;
}
}
} else {
if (cot4 > 0) {
putchar('4');
cot4--;
while (ret4 > 0) {
putchar('4');
ret4--;
}
}
}
}
puts("");
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int INP, AM;
char BUF[(1 << 10) + 1], *inp = BUF;
const double PI = acos(-1.0);
bool can(int start, int n4, int n7, int n47, int n74) {
if (start == 7) return can(4, n7, n4, n74, n47);
if (abs(n47 - n74) > 1) return false;
if (n4 <= 0) return false;
if (n7 < 0) return false;
if (n47 < 0) return false;
if (n74 < 0) return false;
if (n4 && n7 && !n47 && !n74) return false;
if (n47 == n74) {
return n4 >= n47 + 1 && n7 >= n47;
} else if (n47 > n74) {
return n4 >= n47 && n7 >= n47;
} else
return false;
}
int main() {
int n4, n7, n47, n74;
while (cin >> n4 >> n7 >> n47 >> n74) {
int must = 0, last = 0;
if (!can(4, n4, n7, n47, n74) && !can(7, n4, n7, n47, n74)) {
puts("-1");
continue;
}
while (n4 || n7) {
int cur;
if (must) {
cur = must;
} else if (can(4, n4, n7, n47, n74))
cur = 4;
else if (can(7, n4, n7, n47, n74))
cur = 7;
else {
cout << "-1";
break;
}
printf("%d", cur);
if (cur == 4) {
n4--;
if (can(4, n4, n7, n47, n74)) {
must = 4;
} else {
must = 7;
n47--;
}
} else {
n7--;
if (can(4, n4, n7, n47, n74 - 1)) {
must = 4;
n74--;
} else {
must = 7;
}
}
last = cur;
}
puts("");
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a1, a2, a3, a4;
string get(string a, int cnt4, int cnt7) {
int k = -1;
for (int i = 0; i < a.size(); i++)
if (a[i] == '4') {
k = i;
break;
}
string str4 = "", str7 = "";
for (int i = 0; i < cnt4; i++) str4 += '4';
for (int i = 0; i < cnt7; i++) str7 += '7';
a.insert(k, str4);
for (int i = a.size() - 1; i >= 0; i--) {
if (a[i] == '7') {
k = i;
break;
}
}
a.insert(k, str7);
return a;
}
int main() {
cin >> a1 >> a2 >> a3 >> a4;
if (abs(a3 - a4) > 1) {
cout << -1 << endl;
return 0;
}
string root = "";
if (a3 == a4) {
if (a1 >= a3 + 1 && a2 >= a4) {
for (int i = 0; i < a3; i++) root += "47";
root += "4";
cout << get(root, a1 - (a3 + 1), a2 - a4) << endl;
return 0;
}
if (a2 >= a4 + 1 && a1 >= a3) {
for (int i = 0; i < a3; i++) root += "74";
root += "7";
cout << get(root, a1 - a3, a2 - (a4 + 1)) << endl;
return 0;
}
cout << -1 << endl;
} else if (a3 > a4) {
if (a1 < a4 + 1 || a2 < a4 + 1) {
cout << -1 << endl;
return 0;
}
for (int i = 0; i < a3; i++) root += "47";
cout << get(root, a1 - (a4 + 1), a2 - (a4 + 1)) << endl;
} else {
if (a1 < a3 + 1 || a2 < a3 + 1) {
cout << -1 << endl;
return 0;
}
for (int i = 0; i < a4; i++) root += "74";
cout << get(root, a1 - (a3 + 1), a2 - (a3 + 1)) << endl;
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a1, a2, a3, a4;
deque<char> ans;
int32_t main() {
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
;
cin >> a1 >> a2 >> a3 >> a4;
if (a3 > min(a1, a2) || a4 > min(a1, a2) || abs(a3 - a4) > 1) {
cout << "-1";
return 0;
}
for (int i = 1; i <= a3; i++) {
ans.push_back('4');
ans.push_back('7');
}
a1 -= a3;
a2 -= a3;
a4 -= max(0, a3 - 1);
a3 = 0;
if (a1 && a4) {
ans.push_back('4');
a1--;
a4--;
}
if (a2 && a4) {
ans.push_front('7');
a2--;
a4--;
}
if (a3 || a4) {
cout << "-1";
return 0;
}
int first4 = -1, last7 = 0;
for (int i = 0; i < ans.size(); i++) {
if ((ans[i] == '4') && first4 == -1) first4 = i;
if (ans[i] == '7') last7 = i;
}
for (int i = 0; i < ans.size(); i++) {
if (i == first4) {
while (a1 > 0) {
cout << "4";
a1--;
}
}
if (i == last7) {
while (a2 > 0) {
cout << "7";
a2--;
}
}
cout << ans[i];
}
return 0;
}
|
#include <bits/stdc++.h>
const long long MOD = 1e9 + 7;
const long long MAXN = 4e6 + 1;
using namespace std;
long long readInt() {
bool minus1 = false;
long long result = 0;
char ch;
ch = getchar();
while (true) {
if (ch == '-') break;
if (ch >= '0' && ch <= '9') break;
ch = getchar();
}
if (ch == '-')
minus1 = true;
else
result = ch - '0';
while (true) {
ch = getchar();
if (ch<'0' | ch> '9') break;
result = result * 10 + (ch - '0');
}
if (minus1)
return -result;
else
return result;
}
int used[MAXN];
int main() {
int a1 = readInt(), a2 = readInt(), a3 = readInt(), a4 = readInt();
if (abs(a3 - a4) > 1) {
cout << -1;
return 0;
}
string s1 = "47";
string s2 = "74";
string ans = "";
if (a3 == a4) {
for (int i = 1; i <= a3; i++) {
ans += s1;
ans += s2;
}
} else {
if (a3 - 1 == a4) {
for (int i = 1; i <= a4; i++) {
ans += s1;
ans += s2;
}
ans += s1;
} else {
for (int i = 1; i <= a3; i++) {
ans += s2;
ans += s1;
}
ans += s2;
}
}
int f = 0;
label:
f++;
int count_4 = 0;
int count_7 = 0;
for (int i = 0; i < ans.size(); i++) {
count_4 += (ans[i] == '4');
count_7 += (ans[i] == '7');
}
int dif_4 = count_4 - a1;
int dif_7 = count_7 - a2;
for (int i = 0; i < ans.size(); i++) {
if (i && ans[i] == ans[i - 1] && ans[i] == '4') {
used[i] = 1;
dif_4--;
}
if (i && ans[i] == ans[i - 1] && ans[i] == '7') {
used[i] = 1;
dif_7--;
}
}
if (dif_4 > 0 || dif_7 > 0) {
if (a3 == a4 && f == 1) {
swap(s1, s2);
ans = "";
for (int i = 1; i <= a3; i++) {
ans += s1;
ans += s2;
}
goto label;
}
cout << -1;
return 0;
}
if (dif_4 < 0 || dif_7 < 0) {
int in_4 = -1;
int in_7 = -1;
for (int i = 0; i < ans.size(); i++) {
if (!used[i]) {
if (ans[i] == '4') {
if (in_4 == -1) in_4 = i;
} else {
in_7 = i;
}
}
}
for (int i = 0; i < ans.size(); i++) {
if (!used[i]) {
cout << ans[i];
if (i == in_4) {
for (int j = 1; j <= -dif_4; j++) {
cout << 4;
}
}
if (i == in_7) {
for (int j = 1; j <= -dif_7; j++) {
cout << 7;
}
}
}
}
} else {
for (int i = 0; i < ans.size(); i++) {
if (!used[i]) {
cout << ans[i];
}
}
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int cnt4, cnt7, cnt47, cnt74;
scanf("%d%d%d%d", &cnt4, &cnt7, &cnt47, &cnt74);
if (abs(cnt47 - cnt74) > 1) {
printf("-1\n");
return 0;
}
string root = "";
if (cnt47 == cnt74) {
int ocnt4 = cnt4, ocnt7 = cnt7;
for (int i = 0; i < cnt47; i++) {
root += "47";
cnt4--;
cnt7--;
}
root += "4";
cnt4--;
if (cnt4 < 0 || cnt7 < 0) {
root = "";
cnt4 = ocnt4;
cnt7 = ocnt7;
for (int i = 0; i < cnt47; i++) {
root += "74";
cnt4--;
cnt7--;
}
root += "7";
cnt7--;
}
}
if (cnt47 == cnt74 + 1) {
for (int i = 0; i < cnt47; i++) {
root += "47";
cnt4--;
cnt7--;
}
}
if (cnt47 + 1 == cnt74) {
for (int i = 0; i < cnt74; i++) {
root += "74";
cnt4--;
cnt7--;
}
}
if (cnt4 >= 0 && cnt7 >= 0) {
bool found4 = false;
for (int i = 0; i < root.length(); i++) {
if (!found4 && root[i] == '4') {
while (cnt4--) cout << '4';
found4 = true;
}
if (i == root.length() - 1)
while (cnt7--) cout << '7';
cout << root[i];
}
cout << endl;
} else
printf("-1\n");
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a[4];
int b[8];
int main() {
scanf("%d%d%d%d", a, a + 1, a + 2, a + 3);
if (abs(a[2] - a[3]) > 1) {
printf("-1\n");
return 0;
}
b[4] = a[0];
b[7] = a[1];
int g = a[2] + a[3] + 1;
int k = max(a[2], a[3]);
int fir, sec;
if (a[2] == a[3]) {
if (a[0] >= a[2] + 1) {
fir = 4;
sec = 7;
} else if (a[1] >= a[3] + 1) {
fir = 7;
sec = 4;
} else {
printf("-1\n");
return 0;
}
if (a[0] < k || a[1] < k) {
printf("-1\n");
return 0;
}
int end = k - 1;
b[fir] -= end + 2;
b[sec] -= end + 1;
printf("%d", fir);
while (b[4]--) printf("%d", 4);
for (int(i) = 0; (i) < (end); ++(i)) printf("%d%d", sec, fir);
printf("%d", sec);
while (b[7]--) printf("%d", 7);
printf("%d", fir);
printf("\n");
} else {
if (a[0] < k || a[1] < k) {
printf("-1\n");
return 0;
}
if (a[2] > a[3]) {
fir = 4;
sec = 7;
} else {
fir = 7;
sec = 4;
}
int end = k - 1;
b[fir] -= end + 1;
b[sec] -= end + 1;
printf("%d", fir);
while (b[4]--) printf("%d", 4);
printf("%d", sec);
for (int(i) = 0; (i) < (end - 1); ++(i)) printf("%d%d", fir, sec);
printf("%d", fir);
while (b[7]--) printf("%d", 7);
printf("%d", sec);
printf("\n");
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a, b, c, d, ptr = 0;
char res[5000000];
void add(int cnt, char a) {
for (int i = 0; i < cnt; i++) res[ptr++] = a;
}
int main() {
cin >> a >> b >> c >> d;
bool bad = false;
if (abs(c - d) > 1) {
bad = true;
} else if (c == d) {
if (a >= c + 1 && b >= c) {
add(a - c, '4');
for (int i = 0; i < c - 1; i++) {
add(1, '7');
add(1, '4');
}
add(b - c + 1, '7');
add(1, '4');
} else if (a >= c && b >= c + 1) {
add(1, '7');
add(a - c + 1, '4');
for (int i = 0; i < c - 1; i++) {
add(1, '7');
add(1, '4');
}
add(b - c, '7');
} else {
bad = true;
}
} else if (c > d) {
if (a >= c && b >= c) {
add(a - c + 1, '4');
for (int i = 0; i < c - 1; i++) {
add(1, '7');
add(1, '4');
}
add(b - c + 1, '7');
} else
bad = true;
} else if (c < d) {
if (a >= d && b >= d) {
add(1, '7');
if (d == 1) add(b - d, '7');
add(a - d + 1, '4');
for (int i = 0; i < d - 1; i++) {
add(1, '7');
if (i == d - 2) add(b - d, '7');
add(1, '4');
}
} else
bad = true;
}
if (bad)
cout << -1 << endl;
else
printf("%s\n", res);
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
const int M = 2e6 + 5;
int32_t main() {
int a, b, c, d;
cin >> a >> b >> c >> d;
if (abs(c - d) > 1) return cout << -1 << endl, 0;
string ans = "";
if (max(c, d) > min(a, b)) return cout << -1 << endl, 0;
if (c == d + 1) {
int t4 = a - c;
int t7 = b - c;
while (t4--) ans += "4";
while (c--) ans += "47";
while (t7--) ans += "7";
return cout << ans << endl, 0;
}
if (c + 1 == d) {
int t4 = a - d;
int t7 = b - d;
if (d == 1) {
while (b--) ans += "7";
while (a--) ans += "4";
return cout << ans << endl, 0;
}
ans += "7";
while (t4--) ans += "4";
ans += "4";
d--;
int y = d - 1;
while (y) ans += "74", y--;
while (t7--) ans += "7";
ans += "74";
return cout << ans << endl, 0;
}
if (c == d) {
if (max(a, b) < max(c, d) + 1) return cout << -1 << endl, 0;
if (a >= c + 1) {
int t4 = a - c;
int t7 = b - c;
while (t4--) ans += "4";
int u = d - 1;
while (u--) ans += "74";
while (t7--) ans += "7";
ans += "74";
} else {
int t7 = b - c;
while (d--) ans += "74";
while (t7--) ans += "7";
}
return cout << ans << endl, 0;
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
int a, b, c, d;
cin >> a >> b >> c >> d;
if (a < c || a < d || b < c || b < d || abs(c - d) > 1 ||
(a && b && !(c + d)) || min(a, b) * 2 - 1 + (a != b) < c + d)
return cout << -1 << endl, 0;
if (c == d) {
if (a - 1 >= d) {
for (int i = d; i < a - 1; ++i) cout << 4;
for (int i = 0; i < d; ++i) cout << 47;
for (int i = d; i < b; ++i) cout << 7;
cout << 4;
cout << endl;
return 0;
}
for (int i = 0; i < d; ++i) cout << 74;
for (int i = d; i < b; ++i) cout << 7;
cout << endl;
return 0;
}
if (c > d) {
for (int i = c; i < a; ++i) cout << 4;
for (int i = 0; i < c; ++i) cout << 47;
for (int i = c; i < b; ++i) cout << 7;
cout << endl;
return 0;
}
cout << 74;
for (int i = d; i < a; ++i) cout << 4;
for (int i = 0; i < d - 2; ++i) cout << 74;
for (int i = d - 1; i < b; ++i) cout << 7;
cout << 4;
cout << endl;
return 0;
}
|
#include <bits/stdc++.h>
#pragma comment(linker, "/stack:64000000")
using namespace std;
template <typename X>
inline X abs(const X& a) {
return a < 0 ? -a : a;
}
template <typename X>
inline X sqr(const X& a) {
return a * a;
}
const int INF = INT_MAX / 2;
const long double EPS = 1e-9;
const long double PI = 3.1415926535897932384626433832795;
const int N = 5000 * 1000 + 13;
int a[4];
int sz = 0;
char ans[N];
int cnt[4];
inline void error() {
puts("-1");
exit(0);
}
inline void print() {
assert(cnt[2] == a[2] && cnt[3] == a[3]);
assert(cnt[0] <= a[0] && cnt[1] <= a[1]);
int last = -1;
for (int i = 0; i < int(sz); i++)
if (ans[i] == '7') last = i;
for (int i = 0; i < int(sz); i++) {
if (ans[i] == '4') {
while (cnt[0] < a[0]) {
putchar('4');
cnt[0]++;
}
}
if (i == last) {
assert(ans[i] == '7');
while (cnt[1] < a[1]) {
putchar('7');
cnt[1]++;
}
}
putchar(ans[i]);
}
puts("");
exit(0);
}
int main() {
for (int i = 0; i < int(4); i++) cin >> a[i];
if (abs(a[3] - a[2]) > 1) error();
if (a[2] >= a[3]) {
sz = 0;
memset(cnt, 0, sizeof(cnt));
for (int i = 0; i < int(a[2]); i++) ans[sz++] = '4', ans[sz++] = '7';
cnt[0] = a[2];
cnt[1] = a[2];
cnt[2] = a[2];
cnt[3] = a[2] - 1;
if (a[2] == a[3]) ans[sz++] = '4', cnt[0]++, cnt[3]++;
bool ok = true;
for (int i = 0; i < int(4); i++)
if (cnt[i] > a[i]) ok = false;
if (ok) print();
}
if (a[3] >= a[2]) {
sz = 0;
memset(cnt, 0, sizeof(cnt));
for (int i = 0; i < int(a[3]); i++) ans[sz++] = '7', ans[sz++] = '4';
cnt[0] = a[3];
cnt[1] = a[3];
cnt[3] = a[3];
cnt[2] = a[3] - 1;
if (a[2] == a[3]) ans[sz++] = '7', cnt[1]++, cnt[2]++;
bool ok = true;
for (int i = 0; i < int(4); i++)
if (cnt[i] > a[i]) ok = false;
if (ok) print();
}
error();
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
const int inf = 0x3f3f3f3f;
const long long infll = 0x3f3f3f3f3f3f3f3f;
const long long mod = 1e9 + 7;
const int maxn = 2e5 + 10;
int main() {
int num4, num7, num47, num74;
cin >> num4 >> num7 >> num47 >> num74;
if (abs(num47 - num74) >= 2) {
cout << "-1";
return 0;
}
if (num47 - num74 == 1) {
num7 -= num47, num4 -= num47;
if (num4 < 0 or num7 < 0) {
cout << "-1";
return 0;
}
for (int i = 1; i <= num4; ++i) cout << "4";
for (int i = 1; i <= num47; ++i) cout << "47";
for (int i = 1; i <= num7; ++i) cout << "7";
} else if (num74 - num47 == 1) {
num4 -= num74, num7 -= num74;
if (num4 < 0 or num7 < 0) {
cout << "-1";
return 0;
}
cout << "7";
for (int i = 1; i <= num4; ++i) cout << "4";
for (int i = 1; i <= num47; ++i) cout << "47";
for (int i = 1; i <= num7; ++i) cout << "7";
cout << "4";
} else if (num47 == num74) {
num4 -= num47, num7 -= num47;
if (num4 >= 1 and num7 >= 0) {
for (int i = 1; i < num4; ++i) cout << "4";
for (int i = 1; i <= num47; ++i) cout << "47";
for (int i = 1; i <= num7; ++i) cout << "7";
cout << "4";
} else if (num7 >= 1 and num4 >= 0) {
cout << "7";
for (int i = 1; i <= num47; ++i) cout << "47";
for (int i = 1; i < num7; ++i) cout << "7";
} else {
printf("-1\n");
return 0;
}
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
long long a, b, c, d, i, j, k, l;
cin >> a >> b >> c >> d;
if (c == d) {
if (max(a, b) >= c + 1 && min(a, b) >= c) {
if (a >= c + 1) {
a -= c + 1;
b -= c;
while (a-- && a >= 0) cout << "4";
while (c-- && c >= 0) {
cout << "47";
}
while (b-- && b >= 0) {
cout << "7";
}
cout << "4";
} else {
b -= c;
while (c--) {
cout << "74";
}
while (b-- && b >= 0) cout << "7";
}
} else
cout << -1;
} else if (abs(c - d) > 1) {
cout << -1;
} else {
k = max(c, d);
if (min(a, b) >= k) {
a -= k;
b -= k;
if (d > c) {
cout << "7";
while (a--) cout << "4";
cout << "4";
k -= 2;
while (k-- && k >= 0) {
cout << "74";
}
cout << "7";
while (b--) cout << "7";
cout << "4";
} else {
while (a--) cout << "4";
while (k--) cout << "47";
while (b--) cout << "7";
}
} else {
cout << -1;
}
}
}
|
#include <bits/stdc++.h>
using namespace std;
#pragma comment(linker, "/STACK:255000000")
bool firstout = 1;
template <class T>
void minn(T &a, T b) {
if (b < a) a = b;
}
template <class T>
void maxx(T &a, T b) {
if (a < b) a = b;
}
int madd(int &a, int b) {
a += b;
if (a >= 1000000009) a -= 1000000009;
return a;
}
int msub(int &a, int b) {
a -= b;
if (a < 0) a += 1000000009;
return a;
}
int mmult(int &a, int b) { return a = (long long)a * b % 1000000009; }
int mdiv(long long a, long long b, long long m) {
a = (a % m + m) % m;
b = (b % m + m) % m;
if (a % b == 0) return a / b;
return (a + m * mdiv(-a, m, b)) / b;
}
int n, m;
int A[1012];
int main() {
int i, j, k;
char c;
int a, d;
int a4, a7, a47, a74;
int ts;
for (ts = 1; scanf("%"
"d",
&(a4)) > 0;
++ts) {
scanf(
"%"
"d",
&(a7));
scanf(
"%"
"d",
&(a47));
scanf(
"%"
"d",
&(a74));
if (a47 == a74)
if (a4 == a47)
if (a7 < a47 + 1)
printf(
"%"
"d",
(-1));
else {
for (i = (0); i < (a47); ++i)
printf(
"%"
"d",
(7)),
printf(
"%"
"d",
(4));
for (i = (0); i < (a7 - a47); ++i)
printf(
"%"
"d",
(7));
}
else if (a4 < a47 + 1 || a7 < a47)
printf(
"%"
"d",
(-1));
else {
for (i = (0); i < (a4 - a47); ++i)
printf(
"%"
"d",
(4));
for (i = (0); i < (a47 - 1); ++i)
printf(
"%"
"d",
(7)),
printf(
"%"
"d",
(4));
for (i = (0); i < (a7 - a47 + 1); ++i)
printf(
"%"
"d",
(7));
printf(
"%"
"d",
(4));
}
else if (a47 == a74 + 1)
if (a4 < a47 || a7 < a47)
printf(
"%"
"d",
(-1));
else {
for (i = (0); i < (a4 - a47 + 1); ++i)
printf(
"%"
"d",
(4));
for (i = (0); i < (a47 - 1); ++i)
printf(
"%"
"d",
(7)),
printf(
"%"
"d",
(4));
for (i = (0); i < (a7 - a47 + 1); ++i)
printf(
"%"
"d",
(7));
}
else if (a74 == a47 + 1)
if (a4 < a74 || a7 < a74)
printf(
"%"
"d",
(-1));
else {
printf(
"%"
"d",
(7));
for (i = (0); i < (a4 - a74 + 1); ++i)
printf(
"%"
"d",
(4));
for (i = (0); i < (a74 - 2); ++i)
printf(
"%"
"d",
(7)),
printf(
"%"
"d",
(4));
for (i = (0); i < (a7 - a74 + 1); ++i)
printf(
"%"
"d",
(7));
printf(
"%"
"d",
(4));
}
else
printf(
"%"
"d",
(-1));
printf("\n"), firstout = 1;
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a[4];
void fail() {
printf("-1");
exit(0);
}
string s;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
for (auto i = 0; i != 4; i++) scanf("%d", &a[i]);
if (abs(a[2] - a[3]) >= 2) {
printf("-1");
return 0;
}
if (a[2] > a[3]) {
if (a[1] < a[2]) fail();
if (a[0] < a[3] + 1) fail();
for (auto i = 0; i != a[0] - a[3]; i++) printf("4");
a[0] = a[3];
int b7 = a[2];
int _c = 1;
while (a[0] + a[1] > 0) {
if (_c) {
b7--;
printf("7");
a[1]--;
if (b7 == 0)
while (a[1] > 0) {
printf("7");
a[1]--;
}
} else {
printf("4");
a[0]--;
}
_c = 1 - _c;
}
return 0;
} else if (a[2] < a[3]) {
if (a[0] < a[3]) fail();
if (a[1] < a[2] + 1) fail();
int _c = 1;
printf("7");
a[1]--;
for (auto i = 0; i != a[0] - (a[3] - 1); i++) printf("4");
a[0] = (a[3] - 1);
int b7 = a[2];
while (a[0] + a[1] > 0) {
if (_c) {
b7--;
printf("7");
a[1]--;
if (b7 == 0)
while (a[1] > 0) {
printf("7");
a[1]--;
}
} else {
printf("4");
a[0]--;
}
_c = 1 - _c;
}
return 0;
}
if (a[1] < a[2] || a[0] < a[3] + 1) {
if (a[0] < a[3]) fail();
if (a[1] < a[2] + 1) fail();
int _c = 1;
printf("7");
a[1]--;
for (auto i = 0; i != a[0] - (a[3] - 1); i++) printf("4");
a[0] = (a[3] - 1);
int b7 = a[2];
while (a[0] + a[1] > 0) {
if (_c) {
b7--;
printf("7");
a[1]--;
if (b7 == 0)
while (a[1] > 0) {
printf("7");
a[1]--;
}
} else {
printf("4");
a[0]--;
}
_c = 1 - _c;
}
} else {
for (auto i = 0; i != a[0] - a[3]; i++) printf("4");
a[0] = a[3];
int b7 = a[2];
int _c = 1;
while (a[0] + a[1] > 0) {
if (_c) {
b7--;
printf("7");
a[1]--;
if (b7 == 0)
while (a[1] > 0) {
printf("7");
a[1]--;
}
} else {
printf("4");
a[0]--;
}
_c = 1 - _c;
}
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int cnt4, cnt7, cnt47, cnt74;
int main() {
ios::sync_with_stdio(false);
cin >> cnt4 >> cnt7 >> cnt47 >> cnt74;
if (abs(cnt47 - cnt74) > 1) {
puts("-1");
return 0;
}
string ans;
if (cnt47 < cnt74) {
assert(cnt47 + 1 == cnt74);
while (cnt74--) ans += "74", cnt4--, cnt7--;
} else if (cnt47 > cnt74) {
assert(cnt47 == cnt74 + 1);
while (cnt47--) ans += "47", cnt4--, cnt7--;
} else {
assert(cnt47 == cnt74);
while (cnt47--) ans += "47", cnt4--, cnt7--;
if (cnt4 > 0)
ans.push_back('4'), cnt4--;
else {
if (cnt7 <= 0) {
puts("-1");
return 0;
}
ans = '7' + ans;
cnt7--;
}
}
if (cnt4 < 0 || cnt7 < 0) {
puts("-1");
return 0;
}
int pos4 = -1, pos7 = -1;
for (int i = 0; i < ans.size(); i++) {
if (ans[i] == '4' && pos4 == -1) pos4 = i;
if (ans[i] == '7') pos7 = i;
}
if (pos4 != -1) ans.insert(ans.begin() + pos4, cnt4, '4');
if (pos7 != -1) ans.insert(ans.begin() + cnt4 + pos7, cnt7, '7');
cout << ans << '\n';
}
|
#include <bits/stdc++.h>
using namespace std;
int Mod(int x) { return (x % 1000000007 + 1000000007) % 1000000007; }
long long gcd(long long a, long long b) { return (b == 0 ? a : gcd(b, a % b)); }
long long lcm(long long a, long long b) { return (a * (b / gcd(a, b))); }
long long bigmod(long long b, long long p, long long m) {
if (p == 0) return 1;
if (p % 2 == 0) {
long long temp = bigmod(b, p / 2, m);
return (temp * temp) % m;
}
return (bigmod(b, p - 1, m) * (b % m)) % m;
}
char inp[10010];
string scan() {
scanf("%s", inp);
string s;
for (int i = 0; inp[i]; i++) s += inp[i];
return s;
}
int com(string t, string s) {
string a, b;
a = s + t;
b = t + s;
for (int i = 0; i < a.length(); i++) {
if (a[i] > b[i]) return 1;
if (a[i] < b[i]) return 0;
}
return 0;
}
vector<vector<int> > v;
vector<bool> visited;
int dfs(int node) {
visited[node] = 1;
for (int i = 0; i < (int)v[node].size(); i++) {
if (!visited[v[node][i]]) dfs(v[node][i]);
}
}
int connectedcomponenetscnt(int head) {
int cnt = 0;
for (int i = 1; i < 500; i++) {
if (!visited[i]) {
dfs(i);
cnt++;
}
}
return cnt;
}
int a[4];
int check() {
int R = 0;
if (a[2] == a[3] && (a[0] < a[2] || a[1] < a[2] || (max(a[0], a[1]) <= a[2])))
R = 1;
int maxx = max(a[2], a[3]);
if (abs(a[2] - a[3]) == 1 && (a[0] < maxx || a[1] < maxx)) R = 1;
if (abs(a[2] - a[3]) > 1 || (R)) return 0;
return 1;
}
int main() {
for (int i = 0; i < 4; i++) cin >> a[i];
int yes = check();
if (!yes) {
cout << -1;
return 0;
}
string s;
if (a[2] == a[3]) {
if (a[0] > a[2]) {
for (int i = 0; i < a[2]; i++) {
s += "47";
a[0]--;
a[1]--;
}
s += '4';
a[0]--;
} else {
for (int i = 0; i < a[3]; i++) {
s += "74";
a[0]--;
a[1]--;
}
s += '7';
a[1]--;
}
} else {
if (a[2] > a[3]) {
for (int i = 0; i < a[2]; i++) {
s += "47";
a[0]--;
a[1]--;
}
} else {
for (int i = 0; i < a[3]; i++) {
s += "74";
a[0]--;
a[1]--;
}
}
}
int j = 0;
for (int i = 0; i < s.length(); i++)
if (s[i] == '7') j = i;
for (int i = 0; i < s.length(); i++) {
printf("%c", s[i]);
if (s[i] == '4' && a[0] > 0) {
while (a[0] > 0) {
a[0]--;
cout << 4;
}
}
if (i == j && a[1] > 0) {
while (a[1] > 0) {
a[1]--;
cout << 7;
}
}
}
while (a[0] > 0 || a[1] > 0) {
if (a[0])
cout << 4;
else
cout << 7;
a[0]--;
a[1]--;
}
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int i, i4, i7, i47, i74;
cin >> i4 >> i7 >> i47 >> i74;
if (i74 - i47 > 1 || i74 - i47 < -1 || i47 > i4 || i47 > i7 || i74 > i4 ||
i74 > i7)
cout << -1;
else {
if (i47 > i74) {
for (i = 0; i < i4 - i47; i++) cout << '4';
for (i = 0; i < i47; i++) cout << "47";
for (i = 0; i < i7 - i47; i++) cout << '7';
}
if (i74 > i47) {
cout << "74";
for (i = 0; i < i4 - i74; i++) cout << '4';
for (i = 0; i < i74 - 2; i++) cout << "74";
for (i = 0; i < i7 - i74; i++) cout << '7';
cout << "74";
}
if (i74 == i47) {
if (i4 < i47 + 1 && i7 < i47 + 1)
cout << -1;
else {
if (i4 > i47) {
cout << '4';
for (i = 0; i < i4 - 1 - i74; i++) cout << '4';
for (i = 0; i < i74 - 1; i++) cout << "74";
for (i = 0; i < i7 - i74; i++) cout << '7';
cout << "74";
} else {
cout << "74";
for (i = 0; i < i4 - i74; i++) cout << '4';
for (i = 0; i < i74 - 1; i++) cout << "74";
for (i = 0; i < i7 - i74 - 1; i++) cout << '7';
cout << "7";
}
}
}
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 3000000;
int a[MAXN], b[MAXN];
int main() {
int n, m, a1, a2, a3, a4;
cin >> a1 >> a2 >> a3 >> a4;
if (a3 == a4)
if (a1 <= a3) {
for (n = 0; a3 > 0; a1--, a2--, a3--, a4--) {
a[n++] = 7;
a[n++] = 4;
}
a[n++] = 7;
a2--;
} else {
for (n = 0; a3 > 0; a1--, a2--, a3--, a4--) {
a[n++] = 4;
a[n++] = 7;
}
a[n++] = 4;
a1--;
}
else if (a3 > a4) {
for (n = 0; a4 >= 0; a1--, a2--, a3--, a4--) {
a[n++] = 4;
a[n++] = 7;
}
a4++;
} else {
for (n = 0; a3 >= 0; a1--, a2--, a3--, a4--) {
a[n++] = 7;
a[n++] = 4;
}
a3++;
}
if (a1 < 0 || a2 < 0 || a3 != 0 || a4 != 0) {
cout << -1;
return 0;
}
b[0] = a[0];
m = 1;
while (a1--) b[m++] = 4;
for (int i = 1; i < n - 1; i++) b[m++] = a[i];
while (a2--) b[m++] = 7;
b[m++] = a[n - 1];
for (int i = 0; i < m; i++) cout << b[i];
cout << endl;
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a, b, c, d;
int main() {
cin >> a >> b >> c >> d;
if (c - d < -1 || c - d > 1 || a < max(c, d) || b < max(c, d)) {
cout << -1;
return 0;
}
if (c - d == -1) {
for (int i = 0; i < d; i++) {
if (i == d - 1)
for (int j = b; j > d; j--) cout << 7;
cout << 74;
if (!i)
for (int j = a; j > d; j--) cout << 4;
}
}
if (c - d == 1) {
for (int i = a; i > c; i--) cout << 4;
for (int i = 0; i < c; i++) cout << 47;
for (int i = b; i > c; i--) cout << 7;
}
if (c == d) {
if (a == c && b == d) {
cout << -1;
return 0;
}
if (a > c) {
for (int i = a; i > c + 1; i--) cout << 4;
for (int i = 0; i < c; i++) {
cout << 47;
}
for (int i = b; i > d; i--) cout << 7;
cout << 4;
} else {
cout << 7;
for (int i = 0; i < c; i++) cout << 47;
for (int i = b; i > d + 1; i--) cout << 7;
}
}
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int a, b, c, d;
cin >> a >> b >> c >> d;
string s = "";
if (c > d + 1 || d > c + 1) {
cout << "-1\n";
return 0;
}
bool e = 0;
if (c < d || (c == d && a < c + 1)) e = 1;
for (int i = 0; i < c + d + 1; i++) {
if ((i + e) % 2)
s += '7';
else
s += '4';
}
for (int i = 0; i < s.size(); i++) {
a -= (s[i] == '4');
b -= (s[i] == '7');
}
if (a < 0 || b < 0) {
cout << "-1\n";
return 0;
}
if (s[0] == '4')
for (int i = 0; i < a + 1; i++) cout << '4';
else
cout << '7';
if (s[1] == '4')
for (int i = 0; i < a; i++) cout << '4';
for (int i = 1; i < s.size() - 1; i++) cout << s[i];
if (s[s.size() - 1] == '7')
for (int i = 0; i < b + 1; i++) cout << '7';
else {
if (b == 0)
cout << '4';
else {
for (int i = 0; i < b; i++) cout << '7';
cout << '4';
}
}
cout << "\n";
}
|
#include <bits/stdc++.h>
using namespace std;
string build(int first, int p7, int p4) {
string ret = first == 4 ? "4" : "7";
int len = 0;
while (p7 + p4) {
if (ret[len] == '4') {
if (p7)
ret += "7", p7--, len++;
else
return "";
} else {
if (p4)
ret += "4", p4--, len++;
else
return "";
}
}
return ret;
}
string check(string& s, int c4, int c7) {
for (int i = 0, _e(s.size()); i < _e; i++)
if (s[i] == '4')
c4--;
else
c7--;
if (c4 < 0 || c7 < 0) return "";
string ret;
int last7 = -1;
for (int i = 0, _e(s.size()); i < _e; i++)
if (s[i] == '7') last7 = i;
for (int i = 0, _e(s.size()); i < _e; i++)
if (s[i] == '4') {
if (c4)
while (--c4 >= 0) ret += "4";
ret += s[i];
} else {
if (c7 && i == last7)
while (--c7 >= 0) ret += "7";
ret += s[i];
}
return ret;
}
int main() {
int c4, c7, c47, c74;
c4 = c7 = c47 = c74 = 0;
string s;
cin >> c4 >> c7 >> c47 >> c74;
s = build(4, c47, c74);
s = check(s, c4, c7);
if (s.size()) {
cout << s << endl;
return 0;
}
s = build(7, c47, c74);
s = check(s, c4, c7);
if (s.size()) {
cout << s << endl;
return 0;
}
cout << -1 << endl;
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
const int INF = 1e9 + 7;
int a1, a2, a3, a4;
string S;
void solve() {
cin >> a1 >> a2 >> a3 >> a4;
if (abs(a3 - a4) > 1) {
cout << -1;
return;
}
if (max(a3, a4) > a1 || max(a3, a4) > a2) {
cout << -1;
return;
}
string temp = "";
if (a3 > a4 || (a3 == a4 && a3 + 1 <= a1)) {
a1--;
S += '4';
while (a3 || a4) {
int temp = (int)S.size() - 1;
if (S[temp] == '4' && a2 && a3) {
a2--;
a3--;
S += '7';
continue;
}
if (S[temp] == '7' && a1 && a4) {
a4--;
a1--;
S += '4';
continue;
}
cout << -1;
return;
}
int pos = -1;
for (int i = (int)S.size() - 1; i >= 0; i--)
if (S[i] == '7') {
pos = i;
break;
}
if (pos == -1) {
cout << -1;
return;
}
while (a1--) temp += '4';
cout << temp;
temp = "";
while (a2--) temp += '7';
for (int i = 0; i < (int)S.size(); i++) {
cout << S[i];
if (i == pos) cout << temp;
}
return;
}
S = "7";
a2--;
while (a3 || a4) {
int temp = (int)S.size() - 1;
if (S[temp] == '4' && a2 && a3) {
a2--;
a3--;
S += '7';
continue;
}
if (S[temp] == '7' && a1 && a4) {
a4--;
a1--;
S += '4';
continue;
}
cout << -1;
return;
}
int pos = -1;
for (int i = 0; i < (int)S.size(); i++)
if (S[i] == '4') {
pos = i;
break;
}
int pos2 = -1;
for (int i = (int)S.size() - 1; i >= 0; i--)
if (S[i] == '7') {
pos2 = i;
break;
}
if (pos == -1 || pos2 == -1) {
cout << -1;
return;
}
string temp2 = "";
while (a2--) temp2 += '7';
while (a1--) temp += '4';
for (int i = 0; i < (int)S.size(); i++) {
cout << S[i];
if (i == pos)
cout << temp;
else if (i == pos2)
cout << temp2;
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
solve();
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
long long a, b, c, d;
cin >> a >> b >> c >> d;
if (abs(c - d) > 1) {
cout << "-1";
return 0;
}
if (max(c, d) > min(a, b)) {
cout << "-1";
return 0;
}
if (a + b <= c + d) {
cout << "-1";
return 0;
}
if (c == d) {
a--;
for (int i = 1; i <= a - c; i++) cout << '4';
if (a == c - 1 && b > 1) {
cout << '7';
b--;
}
for (int i = 1; i <= c; i++) cout << "47";
for (int i = 1; i <= b - c; i++) cout << '7';
if (a - c >= 0) cout << '4';
}
if (c > d) {
for (int i = 1; i <= a - c; i++) cout << '4';
for (int i = 1; i <= c; i++) cout << "47";
for (int i = 1; i <= b - c; i++) cout << '7';
}
if (c < d) {
if (b > 1) {
cout << '7';
b--;
}
for (int i = 1; i < a - c; i++) cout << '4';
for (int i = 1; i <= c; i++) cout << "47";
for (int i = 1; i <= b - c; i++) cout << '7';
cout << '4';
}
}
|
#include <bits/stdc++.h>
using namespace std;
bool debug;
const int inf = 1e9 + 5;
const long long INF = (long long)inf * inf;
const int nax = 1e6 + 5;
void nie() {
puts("-1");
exit(0);
}
int main(int argc, char *argv[]) {
debug = argc > 1;
int cel4, cel7, cel47, cel74;
scanf("%d%d%d%d", &cel4, &cel7, &cel47, &cel74);
if (abs(cel47 - cel74) > 1) nie();
if (cel47 == cel74) {
if (cel4 == cel47) {
int k = cel47;
if (cel7 <= k) nie();
for (int i = 0; i <= (k)-1; ++i) printf("74");
for (int _ = 0; _ <= (cel7 - k) - 1; ++_) printf("7");
return 0;
}
if (cel4 < cel47) nie();
assert(cel4 > cel47);
if (cel7 < cel47) nie();
int k = cel47;
for (int _ = 0; _ <= (cel4 - k) - 1; ++_) printf("4");
for (int _ = 0; _ <= (k - 1) - 1; ++_) printf("74");
for (int _ = 0; _ <= (cel7 - k + 1) - 1; ++_) printf("7");
printf("4");
return 0;
}
if (cel47 < cel74) {
int k = cel74;
assert(k >= 2);
if (cel4 - k + 1 < 1) nie();
if (cel7 - k + 1 < 1) nie();
printf("7");
for (int _ = 0; _ <= (cel4 - k + 1) - 1; ++_) printf("4");
for (int _ = 0; _ <= (k - 2) - 1; ++_) printf("74");
for (int _ = 0; _ <= (cel7 - k + 1) - 1; ++_) printf("7");
printf("4");
return 0;
}
int k = cel47;
assert(k >= 2);
if (cel4 - k + 1 < 1) nie();
if (cel7 - k + 1 < 1) nie();
for (int _ = 0; _ <= (cel4 - k + 1) - 1; ++_) printf("4");
for (int _ = 0; _ <= (k - 1) - 1; ++_) printf("74");
for (int _ = 0; _ <= (cel7 - k + 1) - 1; ++_) printf("7");
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
bool lucky(char a) {
if (a == '4' || a == '7')
return true;
else
return false;
}
int main() {
long long int a, b, c, d;
vector<bool> res;
cin >> a >> b >> c >> d;
if (abs(c - d) > 1 || min(a, b) < max(c, d)) {
puts("-1");
return 0;
}
if (c > d) {
for (long long int i = 0; i < ((long long int)(a - d)); i++) cout << 4;
for (long long int i = 0; i < ((long long int)(d)); i++) cout << 74;
for (long long int i = 0; i < ((long long int)(b - d)); i++) cout << 7;
} else if (c < d) {
cout << 7;
for (long long int i = 0; i < ((long long int)(a - c)); i++) cout << 4;
for (long long int i = 0; i < ((long long int)(c - 1)); i++) cout << 74;
for (long long int i = 0; i < ((long long int)(b - c)); i++) cout << 7;
cout << 4;
} else {
if (a + b < c + d + 1) {
puts("-1");
return 0;
}
for (long long int i = 0; i < ((long long int)(a - c)); i++) cout << 4;
if (a - c > 0) {
for (long long int i = 0; i < ((long long int)(c - 1)); i++) cout << 74;
for (long long int i = 0; i < ((long long int)(b - c + 1)); i++)
cout << 7;
cout << 4;
} else {
cout << 7;
for (long long int i = 0; i < ((long long int)(c)); i++) cout << 47;
for (long long int i = 0; i < ((long long int)(b - 1 - c)); i++)
cout << 7;
}
}
puts("");
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
void four(int n) {
for (int i = 0; i < n; i++) printf("4");
}
void seven(int n) {
for (int i = 0; i < n; i++) printf("7");
}
void fourty_seven(int n) {
for (int i = 0; i < n; i++) printf("47");
}
void seventy_four(int n) {
for (int i = 0; i < n; i++) printf("74");
}
int main() {
int t, i, j, n, m, ans, sum, a1, a2, a3, a4;
cin >> a1 >> a2 >> a3 >> a4;
if (a1 >= max(a3, a4) && a2 >= max(a3, a4)) {
if (a3 == a4 + 1) {
four(a1 - a3);
fourty_seven(a3);
seven(a2 - a3);
} else if (a4 == a3 + 1) {
seven(1);
four(a1 - a4 + 1);
seventy_four(a4 - 2);
seven(a2 - a4 + 1);
four(1);
} else if (a3 == a4) {
if (a1 > a3) {
four(a1 - a3 - 1);
fourty_seven(a3);
seven(a2 - a3);
four(1);
} else if (a2 > a3 && a1 == a3) {
seventy_four(a3);
seven(a2 - a3);
} else if (a2 > a3) {
four(a1 - a3);
fourty_seven(a3);
seven(a2 - a3);
} else
cout << "-1";
} else
cout << "-1";
} else
cout << "-1";
return 0;
}
|
#include <bits/stdc++.h>
int a, b, c, d, i;
int main() {
scanf("%d%d%d%d", &a, &b, &c, &d);
if (c == d) {
if (a < d + 1) {
if (b < d + 1 || a < d)
puts("-1");
else {
putchar('7');
b--;
for (i = 1; i <= d; i++) {
while (a > d - i) {
putchar('4');
a--;
}
if (i == d)
while (b > 0) {
putchar('7');
b--;
}
else {
putchar('7');
b--;
}
}
}
} else {
if (b < d)
puts("-1");
else {
for (i = 1; i <= d; i++) {
while (a > d + 1 - i) {
putchar('4');
a--;
}
if (i == d)
while (b > 0) {
putchar('7');
b--;
}
else {
putchar('7');
b--;
}
}
while (a > 0) {
putchar('4');
a--;
}
}
}
} else if (c == d - 1) {
if (a < d || b < d)
puts("-1");
else
for (i = 1; i <= d; i++) {
if (i == d)
while (b > 0) {
putchar('7');
b--;
}
else {
putchar('7');
b--;
}
while (a > d - i) {
putchar('4');
a--;
}
}
} else if (c == d + 1) {
if (a < c || b < c)
puts("-1");
else
for (i = 1; i <= c; i++) {
while (a > c - i) {
putchar('4');
a--;
}
if (i == c)
while (b > 0) {
putchar('7');
b--;
}
else {
putchar('7');
b--;
}
}
} else
puts("-1");
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int a1, a2, a3, a4;
scanf("%d%d%d%d", &a1, &a2, &a3, &a4);
if (a1 >= max(a3, a4) && a2 >= max(a3, a4) &&
min(a3, a4) >= max(a3, a4) - 1) {
if (a3 > a4 || (a3 == a4 && a1 >= a3 + 1)) {
putchar('4');
for (int i = 0; i < a1 - a3 + ((a3 == a4) ? (-1) : 0); i++) putchar('4');
putchar('7');
for (int i = 0; i < a3 - 1; i++) {
putchar('4');
putchar('7');
}
for (int i = 0; i < a2 - a3; i++) putchar('7');
if (a3 == a4) putchar('4');
} else if (a4 > a3 || (a3 == a4 && a2 >= a4 + 1)) {
for (int i = 0; i < a4; i++) {
putchar('7');
if (a4 > a3 && i == a4 - 1)
for (int i = 0; i < a2 - a4; i++) putchar('7');
putchar('4');
if (i == 0)
for (int i = 0; i < a1 - a4; i++) putchar('4');
}
if (a3 == a4) {
for (int i = 0; i < a2 - a4; ++i) putchar('7');
}
} else {
printf("-1");
}
} else {
printf("-1");
}
putchar('\n');
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int a, b, c, d, ta, tb;
string r;
cin >> a >> b >> c >> d;
if (c == d) {
ta = 1 + d;
tb = c;
if (a >= ta && b >= tb) {
for (int i = 0; i <= a - ta; ++i) r += "4";
for (int i = 0; i < tb; ++i) {
if (i == tb - 1)
for (int i = 0; i <= b - tb; ++i) r += "7";
else
r += "7";
r += "4";
}
cout << r << '\n';
return 0;
}
}
if (c == d + 1) {
ta = 1 + d;
tb = c;
if (a >= ta && b >= tb) {
for (int i = 0; i < ta; ++i) {
if (i == 0)
for (int i = 0; i <= a - ta; ++i) r += "4";
else
r += "4";
if (i == tb - 1)
for (int i = 0; i <= b - tb; ++i) r += "7";
else
r += "7";
}
cout << r << '\n';
return 0;
}
}
if (c + 1 == d) {
ta = d;
tb = 1 + c;
if (a >= ta && b >= tb) {
for (int i = 0; i < tb; ++i) {
if (i == tb - 1)
for (int i = 0; i <= b - tb; ++i) r += "7";
else
r += "7";
if (i == 0)
for (int i = 0; i <= a - ta; ++i) r += "4";
else
r += "4";
}
cout << r << '\n';
return 0;
}
}
if (c == d) {
ta = d;
tb = 1 + c;
if (a >= ta && b >= tb) {
r += "7";
for (int i = 0; i < ta; ++i) {
if (i == 0)
for (int i = 0; i <= a - ta; ++i) r += "4";
else
r += "4";
if (i == ta - 1)
for (int i = 0; i <= b - tb; ++i) r += "7";
else
r += "7";
}
cout << r << '\n';
return 0;
}
}
cout << "-1\n";
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
constexpr int MOD = 1000000007;
template <typename T>
std::istream& operator>>(std::istream& i, vector<T>& t) {
for (auto& v : t) {
i >> v;
}
return i;
}
template <typename T>
std::ostream& operator<<(std::ostream& o, const vector<T>& t) {
for (size_t i = 0; i < t.size(); ++i) {
o << t[i] << " \n"[i == t.size() - 1];
}
return o;
}
template <typename T>
using minheap = priority_queue<T, vector<T>, greater<T>>;
template <typename T>
using maxheap = priority_queue<T, vector<T>, less<T>>;
int logceil(long long first) {
int b = 0;
while (first) {
first >>= 1;
++b;
}
return b;
}
namespace std {
template <typename T, typename U>
struct hash<pair<T, U>> {
hash<T> t;
hash<U> u;
size_t operator()(const pair<T, U>& p) const {
return t(p.first) ^ (u(p.second) << 7);
}
};
} // namespace std
template <typename T, typename F>
T bsh(T l, T h, const F& f) {
T r = -1, m;
while (l <= h) {
m = (l + h) / 2;
if (f(m)) {
l = m + 1;
r = m;
} else {
h = m - 1;
}
}
return r;
}
template <typename T, typename F>
T bsl(T l, T h, const F& f) {
T r = -1, m;
while (l <= h) {
m = (l + h) / 2;
if (f(m)) {
h = m - 1;
r = m;
} else {
l = m + 1;
}
}
return r;
}
template <typename T>
T gcd(T a, T b) {
if (a < b) swap(a, b);
return b ? gcd(b, a % b) : a;
}
template <typename T>
class vector2 : public vector<vector<T>> {
public:
vector2() {}
vector2(size_t a, size_t b, T t = T())
: vector<vector<T>>(a, vector<T>(b, t)) {}
};
template <typename T>
class vector3 : public vector<vector<vector<T>>> {
public:
vector3() {}
vector3(size_t a, size_t b, size_t c, T t = T())
: vector<vector<vector<T>>>(a, vector<vector<T>>(b, vector<T>(c, t))) {}
};
class B {
public:
bool check(int c4, int c7, int c47, int c74, bool put4, ostream& cout) {
stringstream ss;
while (true) {
if (put4) {
if (!c4) return false;
ss << '4';
--c4;
while (c4 > c74) {
ss << '4';
--c4;
}
if (c47)
--c47;
else
break;
} else {
if (!c7) return false;
ss << '7';
--c7;
if (!c47)
while (c7) {
ss << '7';
--c7;
}
if (c74)
--c74;
else
break;
}
put4 = !put4;
}
if (c4 || c7 || c47 || c74) return false;
cout << ss.str() << endl;
return true;
}
void solve(istream& cin, ostream& cout) {
int c4, c7, c47, c74;
cin >> c4 >> c7 >> c47 >> c74;
if (!check(c4, c7, c47, c74, true, cout) &&
!check(c4, c7, c47, c74, false, cout))
cout << -1 << endl;
}
};
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
B solver;
std::istream& in(std::cin);
std::ostream& out(std::cout);
solver.solve(in, out);
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int a, b, c, d, i;
int main() {
scanf("%d %d %d %d", &a, &b, &c, &d);
if (c > d + 1 || d > c + 1) {
printf("-1\n");
return 0;
}
if (c == d + 1) {
if (c > a || c > b) {
printf("-1\n");
return 0;
}
for (i = 1; i <= a - c; i++) printf("4");
for (i = 1; i <= c; i++) printf("47");
for (i = 1; i <= b - c; i++) printf("7");
printf("\n");
}
if (d == c + 1) {
if (d > a || d > b) {
printf("-1\n");
return 0;
}
printf("7");
for (i = 1; i <= a - d; i++) printf("4");
for (i = 1; i < d; i++) printf("47");
for (i = 1; i <= b - d; i++) printf("7");
printf("4\n");
}
if (c == d) {
if (c > a || c > b) {
printf("-1\n");
return 0;
}
if (a < c + 1 && b < c + 1) {
printf("-1\n");
return 0;
}
if (a >= c + 1) {
for (i = 1; i <= a - c - 1; i++) printf("4");
for (i = 1; i <= c; i++) printf("47");
for (i = 1; i <= b - c; i++) printf("7");
printf("4\n");
} else {
for (i = 1; i <= c; i++) printf("74");
for (i = 1; i <= b - c; i++) printf("7");
printf("\n");
}
}
return 0;
}
|
#include <bits/stdc++.h>
using namespace std;
int c4, c7, c47, c74;
int solve() {
int cnt = (c47 + c74 + 1) / 2;
if (abs(c47 - c74) > 1) return -1;
if (c47 > c74) {
if (c4 < cnt || c7 < cnt) return -1;
for (int i = (1), _b = (c4 - cnt); i <= _b; ++i) cout << '4';
for (int i = (1), _b = (cnt); i <= _b; ++i) cout << "47";
for (int i = (1), _b = (c7 - cnt); i <= _b; ++i) cout << '7';
} else if (c47 < c74) {
if (c4 < cnt || c7 < cnt) return -1;
if (cnt == 1) {
for (int i = (1), _b = (c7); i <= _b; ++i) cout << 7;
for (int i = (1), _b = (c4); i <= _b; ++i) cout << 4;
} else {
cout << '7';
for (int i = (1), _b = (c4 - cnt + 1); i <= _b; ++i) cout << '4';
for (int i = (2), _b = (cnt - 1); i <= _b; ++i) cout << "74";
for (int i = (1), _b = (c7 - cnt + 1); i <= _b; ++i) cout << '7';
cout << '4';
}
} else {
if (c4 < cnt || c7 < cnt) return -1;
if (c4 > cnt) {
for (int i = (1), _b = (c4 - cnt - 1); i <= _b; ++i) cout << 4;
for (int i = (1), _b = (cnt); i <= _b; ++i) cout << 47;
for (int i = (1), _b = (c7 - cnt); i <= _b; ++i) cout << 7;
cout << 4;
} else if (c7 > cnt) {
cout << 7;
for (int i = (1), _b = (c4 - cnt); i <= _b; ++i) cout << 4;
for (int i = (1), _b = (cnt); i <= _b; ++i) cout << 47;
for (int i = (1), _b = (c7 - cnt - 1); i <= _b; ++i) cout << 7;
} else
return -1;
}
cout << endl;
return 0;
}
int main() {
cin >> c4 >> c7 >> c47 >> c74;
if (solve()) cout << "-1" << endl;
return 0;
}
|
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