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#include <bits/stdc++.h>
using namespace std;
int n, u, v, z = 0, f[100001];
int main() {
for (int i = 1; i <= 10000; i++) z++;
for (int i = 1; i <= 100; i++) z--;
cin >> n;
for (int i = 1; i < n; i++) {
cin >> u >> v;
f[u]++;
f[v]++;
}
for (int i = 1; i <= n; i++)
if (f[i] != 1 && f[i] <= 2... |
#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1e9 + 7;
int n, x, y;
vector<int> g[100010];
int main() {
cin >> n;
for (int i = 0; i < n - 1; i++) {
scanf("%d%d", &x, &y);
g[x].push_back(y);
g[y].push_back(x);
}
for (int i = 1; i <= n; i++) {
if (g[i].size() == 2) {
pu... |
#include <bits/stdc++.h>
using namespace std;
long long int n;
vector<long long int> G[200020];
int main() {
ios::sync_with_stdio(false);
cin >> n;
for (int i = 0; i < n - 1; i++) {
int x, y;
cin >> x >> y;
G[x].push_back(y);
G[y].push_back(x);
}
for (int i = 1; i <= n; i++) {
if (G[i].siz... |
#include <bits/stdc++.h>
using namespace std;
int dirx[] = {1, -1, 0, 0}, diry[] = {0, 0, 1, -1};
long long bigmod(long long x, long long p) {
long long res = 1;
while (p) {
if (p & 1) res = (res * x) % 998244353;
x = (x * x) % 998244353;
p >>= 1;
}
return res;
}
int32_t main() {
ios_base::sync_wi... |
#include <bits/stdc++.h>
using namespace std;
int g[100005];
int main() {
int n;
memset(g, 0, sizeof(g));
cin >> n;
for (int i = 1; i < n; i++) {
int u, v;
cin >> u >> v;
g[u]++;
g[v]++;
}
for (int i = 1; i <= n; i++) {
if (g[i] == 2) {
cout << "NO";
return 0;
}
}
cou... |
#include <bits/stdc++.h>
using namespace std;
;
const double eps = 1e-8;
const int mod = 1e9 + 7;
const int maxn = 3e5 + 5;
const int INF = 0x3f3f3f3f;
const long long INFLL = 0x3f3f3f3f3f3f3f3f;
struct EDGE {
int v, nxt;
} edge[maxn << 1];
int head[maxn], tot;
void add_edge(int u, int v) {
edge[tot].v = v, edge[to... |
#include <bits/stdc++.h>
using namespace std;
const int INF = 1e9 + 7;
const int BASE = 1e9 + 7;
const int dx[4] = {-1, 1, 0, 0};
const int dy[4] = {0, 0, -1, 1};
const int N = 1e5 + 1;
vector<int> a[N];
int pa[N], n;
int F[N];
void DFS(int p, int u) {
bool Check = true;
for (__typeof(a[u].begin()) it = a[u].begin(... |
#include <bits/stdc++.h>
using namespace std;
long long power(long long x, long long y, long long p) {
long long res = 1;
x = x % p;
while (y > 0) {
if (y & 1) res = (res * x) % p;
y = y >> 1;
x = (x * x) % p;
}
return res;
}
std::vector<long long> edge[100045];
int main() {
ios_base::sync_with_... |
#include <bits/stdc++.h>
using namespace std;
bool is_prime(long long n) {
for (long long i = 2; i * i <= n; ++i) {
if (n % i == 0) {
return false;
}
}
return true;
}
vector<long long> fact(long long n) {
n = abs(n);
vector<long long> ans;
for (int i = 1; i * i <= n; i++) {
if (n % i == 0)... |
#include <bits/stdc++.h>
using namespace std;
int n, a, b;
vector<int> adj[100005];
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin >> n;
for (int i = (int)1; i <= (int)n - 1; i++) {
cin >> a >> b;
adj[a].push_back(b);
adj[b].push_back(a);
}
for (int i = (int)1; i <= (i... |
#include <bits/stdc++.h>
using namespace std;
const long long inff = 0x3f3f3f3f3f3f3f3f;
int n, x, y, du[100008];
int main() {
cin.tie(0);
cout.tie(0);
cin >> n;
for (int i(1); i <= (n - 1); ++i) {
scanf("%d", &x), scanf("%d", &y);
du[x]++, du[y]++;
}
for (int i(1); i <= (n); ++i)
if (du[i] == 2... |
#include <bits/stdc++.h>
using namespace std;
int main() {
int n, f = 0;
cin >> n;
vector<int> V[100008];
for (int i = 0; i < n - 1; i++) {
int u, v;
cin >> u >> v;
V[u].push_back(v);
V[v].push_back(u);
}
for (int i = 0; i <= n; i++) {
if (V[i].size() == 2) {
f = 1;
break;
... |
#include <bits/stdc++.h>
using namespace std;
int cnt[100005];
int main() {
int n;
scanf("%d", &n);
if (n == 2) {
printf("YES\n");
return 0;
}
if (n == 3) {
printf("NO\n");
return 0;
}
for (int i = 0; i < n - 1; i++) {
int u, v;
scanf("%d%d", &u, &v);
cnt[u]++;
cnt[v]++;
... |
#include <bits/stdc++.h>
using namespace std;
int n;
vector<int> v[101010];
int main() {
scanf("%d", &n);
for (int i = 1; i < n; i++) {
int a, b;
scanf("%d %d", &a, &b);
v[a].push_back(b);
v[b].push_back(a);
}
for (int i = 1; i <= n; i++)
if (v[i].size() == 2) return !printf("NO");
printf(... |
#include <bits/stdc++.h>
using namespace std;
vector<int> g[100005];
int find(int v, int* parent) {
if (parent[v] == v) {
return v;
}
return find(parent[v], parent);
}
int vis[100005];
int dp[100005];
int dfs(int u) {
vis[u] = 1;
for (int i = 0; i < g[u].size(); i++) {
int v = g[u][i];
if (!vis[v]... |
#include <bits/stdc++.h>
int main() {
long long in[100005];
long long n, i, j, m, t;
memset(in, 0, sizeof(in));
scanf("%lld", &n);
for (i = 1; i <= n - 1; i++) {
long long u, v;
scanf("%lld %lld", &u, &v);
in[u]++;
in[v]++;
}
long long num = 0;
long long ans = 0;
int flag = 1;
for (i... |
#include <bits/stdc++.h>
using namespace std;
vector<vector<int>> adj;
int main() {
int n;
cin >> n;
adj = vector<vector<int>>(n + 1);
for (int i = 0; i < n - 1; i++) {
int a, b;
cin >> a >> b;
adj[a].push_back(b);
adj[b].push_back(a);
}
string ans = "YES\n";
int flag = 1;
for (int i = 1... |
#include <bits/stdc++.h>
using namespace std;
int degree[100005];
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int n;
cin >> n;
for (int i = 1; i < n; ++i) {
int u, v;
cin >> u >> v;
++degree[u];
++degree[v];
}
for (int i = 1; i <= n; ++i) {
if (degree[i] == 2) {
cout <<... |
#include <bits/stdc++.h>
using namespace std;
const long long max_n = 1e6 + 20;
long long n, m, k, ans, sum;
long long a[max_n];
long long mark[max_n];
vector<long long> v, adj[max_n], jda[max_n];
void dfs(long long v) {
mark[v] = 1;
if (adj[v].size() == 2) ans = -1;
for (auto i : adj[v]) {
if (!mark[i]) {
... |
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1e5 + 10;
int n, u, v;
int a[MAXN];
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n;
memset(a, 0, sizeof(a));
for (int i = 0; i < n - 1; i++) {
cin >> u >> v;
a[u]++;
a[v]++;
}
long long cnt[3] = {0, 0, 0};
for (i... |
#include <bits/stdc++.h>
using namespace std;
int n, cnt[100009];
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
;
cin >> n;
for (int i = 1; i < n; i++) {
int x, y;
cin >> x >> y;
cnt[x]++, cnt[y]++;
}
for (int i = 1; i <= n; i++)
if (cnt[i] == 2) return cout << "NO"... |
#include <bits/stdc++.h>
using namespace std;
const long long maxn = 1e5 + 10;
long long n, deg[maxn];
long long read() {
long long x = 0, f = 1;
char ch = getchar();
while (ch < '0' || ch > '9') {
if (ch == '-') f = -1;
ch = getchar();
}
while (ch >= '0' && ch <= '9') {
x = x * 10 + ch - '0';
... |
#include <bits/stdc++.h>
using namespace std;
vector<long long> tree[500500];
long long num[500500], fine = 0, n;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
cin >> n;
for (int i = 1; i < n; i++) {
long long u, v;
cin >> u >> v;
tree[u].push_back(v);
tree[v].p... |
#include <bits/stdc++.h>
using namespace std;
const long long mod = 1000000007;
void solve() {
int n, u, v;
cin >> n;
vector<int> Adj[n];
for (int i = 1; i < n; ++i) {
cin >> u >> v;
--u;
--v;
Adj[u].push_back(v);
Adj[v].push_back(u);
}
for (int i = 0; i < n; ++i) {
if (Adj[i].size()... |
#include <bits/stdc++.h>
using namespace std;
const long long mod = 1000000007;
long long powmod(long long a, long long b) {
long long res = 1;
a %= mod;
assert(b >= 0);
for (; b; b >>= 1) {
if (b & 1) res = res * a % mod;
a = a * a % mod;
}
return res;
}
long long gcd(long long a, long long b) { re... |
#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
cin >> n;
vector<vector<int>> g(n);
int f, t;
for (int i = 0; i < n - 1; ++i) {
cin >> f >> t;
f--;
t--;
g[f].push_back(t);
g[t].push_back(f);
}
for (int i = 0; i < n; ++i) {
if (g[i].size() == 2) {
cout << "NO... |
#include <bits/stdc++.h>
using namespace std;
const int N = 2e5 + 10;
int a[N];
int main() {
int n;
scanf("%d", &n);
for (int i = 1; i < n; i++) {
int x, y;
scanf("%d%d", &x, &y);
a[x]++;
a[y]++;
}
for (int i = 1; i <= n; i++)
if (a[i] == 2) {
printf("NO\n");
return 0;
}
... |
#include <bits/stdc++.h>
using namespace std;
const long long N = 1e5 + 7;
long long n;
vector<long long> add[N];
void nie() {
cout << "NO";
exit(0);
}
void yie() {
cout << "YES";
exit(0);
}
int32_t main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
vector<pair<long long, long long>> v;
cin >> n;
... |
#include <bits/stdc++.h>
#pragma GCC optimize("-O2")
using namespace std;
const int LIM = 1e5 + 5, MOD = 1e9 + 7;
const long double EPS = 1e-9;
vector<vector<int> > g;
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n;
cin >> n;
g.resize(n);
for (int i = 0; i < n - 1; ++i) {
in... |
#include <bits/stdc++.h>
using namespace std;
void func() {
int n;
cin >> n;
vector<int> adj[n + 1];
for (int i = 0; i < n - 1; i++) {
int a, b;
cin >> a >> b;
adj[a].push_back(b);
adj[b].push_back(a);
}
for (int i = 1; i <= n; i++) {
if (adj[i].size() == 1) continue;
if (adj[i].size... |
#include <bits/stdc++.h>
using namespace std;
const long long MAX = 1e5 + 10;
long long arr[MAX];
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
int n;
cin >> n;
for (int i = 0; i < n - 1; i++) {
int u, v;
cin >> u >> v;
arr[u]++;
arr[v]++;
}
for (int i = 1; i <= n; i++)
if... |
#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
const int N = 3e5 + 5, M = 1e8 + 5, OO = 1000000;
int T, n, m;
int u, v;
int deg[N];
int main() {
scanf("%d", &n);
for (int i = 1; i < n; ++i) {
scanf("%d %d", &u, &v);
++deg[u], ++deg[v];
}
for (int i = 1; i <= n; ++i) {
if (d... |
#include <bits/stdc++.h>
using namespace std;
int a[100010];
int main() {
int n, flag = 1;
scanf("%d", &n);
for (int i = 1, x, y; i < n; i++) {
scanf("%d %d", &x, &y);
a[x]++;
a[y]++;
}
for (int i = 1; i <= n; i++)
if (a[i] == 2) flag = 0;
flag ? printf("YES") : printf("NO");
}
|
#include <bits/stdc++.h>
using namespace std;
int deg[100005];
int main() {
int n;
scanf("%d", &n);
for (int i = 1; i < n; i++) {
int u, v;
scanf("%d%d", &u, &v);
deg[u]++;
deg[v]++;
}
for (int i = 1; i <= n; i++) {
if (deg[i] == 2) {
printf("NO\n");
return 0;
}
}
print... |
#include <bits/stdc++.h>
using ll = int64_t;
using namespace std;
const int N = 1e6 + 5;
int n;
int a[N];
basic_string<int> g[N];
int32_t main() {
cin.tie(0)->sync_with_stdio(0);
cin >> n;
for (int i = 1, u, v; i < n; i++) {
cin >> u >> v;
g[u] += v;
g[v] += u;
}
for (int i = 1; i <= n; i++) {
... |
#include <bits/stdc++.h>
using namespace std;
int n;
int n1, n2;
int grau[100010];
vector<pair<int, int> > edges;
int main() {
scanf("%d", &n);
for (int g = 0; g < n - 1; g++) {
scanf("%d %d", &n1, &n2);
grau[n1]++;
grau[n2]++;
}
for (int g = 1; g <= n; g++) {
if (grau[g] == 2) {
printf("N... |
#include <bits/stdc++.h>
using namespace std;
int dx8[] = {1, 1, 0, -1, -1, -1, 0, 1};
int dy8[] = {0, 1, 1, 1, 0, -1, -1, -1};
int dx4[] = {1, 0, -1, 0};
int dy4[] = {0, 1, 0, -1};
template <class A, class B>
ostream& operator<<(ostream& out, const pair<A, B>& a) {
return out << "(" << a.first << "," << a.second << ... |
#include <bits/stdc++.h>
using namespace std;
int deg[200000];
int main() {
int n;
cin >> n;
for (int i = 0; i < n - 1; ++i) {
int u, v;
cin >> u >> v;
deg[u]++;
deg[v]++;
}
for (int i = 1; i <= n; ++i) {
if (deg[i] == 2) {
cout << "NO\n";
return 0;
}
}
cout << "YES\n";... |
#include <bits/stdc++.h>
using namespace std;
int main() {
int x, y, n;
cin >> n;
vector<int> v[100010], barg;
for (int i = 0; i < n - 1; i++) {
cin >> x >> y;
v[x].push_back(y);
v[y].push_back(x);
}
for (int i = 1; i <= n; i++) {
if (v[i].size() == 2) {
cout << "NO";
return 0;
... |
#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 1000, mod = 1e9 + 7;
vector<int> vec[N];
long long bin_pow(int x, int y) {
if (y == 0) return 1;
if (y == 1) return x;
if (y % 2 == 0) {
long long z = bin_pow(x, y / 2);
return (z * z) % mod;
}
return (bin_pow(x, y - 1) * x) % mod;
}
bo... |
#include <bits/stdc++.h>
using namespace std;
vector<vector<long long> > g;
void endProg() {
cout << "NO";
exit(0);
}
void dfs(long long v, long long p) {
long long l = 0;
for (auto i : g[v]) {
if (i == p) continue;
if (g[i].size() == 1) {
l++;
continue;
}
dfs(i, v);
}
if (v == 0... |
#include <bits/stdc++.h>
using namespace std;
const long long inf = LONG_MAX;
const long long arr = 1000000;
bool comp(pair<long long, long long> a, pair<long long, long long> b) {
if (a.first == b.first)
return a.second < b.second;
else
return a.first < b.first;
}
vector<vector<long long> > g(arr);
int mai... |
#include <bits/stdc++.h>
using namespace std;
int n, x, y, mx, idx;
int deg[100010];
vector<int> edge[100010];
bool vis[100010];
bool can = true;
void dfs(int u) {
vis[u] = true;
int sz_u = (int)edge[u].size();
if (u != idx && sz_u == 2) {
can = false;
return;
}
for (int i = 0; i < sz_u && can; ++i) {... |
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC target("sse4")
const long double EPS = 1e-9;
const long long INF = 1e9;
const long long mod = 1e9 + 7;
using namespace std;
mt19937 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());
long long n, m, k;
long long q;
vector<vector<long ... |
#include <bits/stdc++.h>
using namespace std;
int32_t main() {
cin.sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
;
long long n;
cin >> n;
vector<vector<long long>> graph(n + 1);
if (n == 2) {
cout << "YES"
<< "\n";
return 0;
}
for (long long i = 0; i < n - 1; i++) {
long long... |
#include <bits/stdc++.h>
using namespace std;
const long long N = 1e5 + 1;
vector<long long> v[N];
int main() {
long long n;
cin >> n;
for (int i = 0; i < n - 1; i++) {
long long x, y;
cin >> x >> y;
v[x].push_back(y);
v[y].push_back(x);
}
for (int i = 1; i <= n; i++) {
if (v[i].size() == ... |
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
long mmid(long a, long b, long c) {
return a < b ? (b < c ? b : max(a, c)) : (b > c ? b : min(a, c));
}
ll modinv(ll a) {
ll b = 1000000007, u = 1, v = 0, t;
while (b) {
t = a / b;
a -= t * b;
swap(a, b);
u -= t * v;
swap(u, v... |
#include <bits/stdc++.h>
using namespace std;
const int mod = 1000000007;
int main() {
ios::sync_with_stdio(0), cin.tie(0);
long long int n;
cin >> n;
vector<long long int> v[n + 1];
for (long long int i = 0; i < n - 1; i++) {
long long int x, y;
cin >> x >> y;
v[x].push_back(y);
v[y].push_bac... |
#include <bits/stdc++.h>
long long mod = 998244353;
using namespace std;
const long long N = 1e5 + 5;
vector<long long> g[N];
long long n;
void fail() {
cout << "NO\n";
exit(0);
}
long long cnt = 1;
void dfs(long long node, long long p = 0) {
if (g[node].size() == 2) cnt = 0;
for (long long nx : g[node]) {
... |
#include <bits/stdc++.h>
using namespace std;
const long long inf = 998244353;
bool cmp(pair<int, pair<int, int>> a, pair<int, pair<int, int>> b) {
if (a.first >= b.first) return false;
return true;
}
int main() {
long long n, i = 0, j, k, m, q, l, r = 0, w, x, y, z = 0;
string t, s;
cin >> n;
vector<vector... |
#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int n;
cin >> n;
vector<int> d(n + 1);
for (int i = 1; i <= n - 1; ++i) {
int u, v;
cin >> u >> v;
d[u]++, d[v]++;
}
bool ok = 1;
for (int i = 1; i <= n; ++i) {
... |
#include <bits/stdc++.h>
using namespace std;
long long gcd(long long a, long long b) {
if (a == 0) return b;
return gcd(b % a, a);
}
int main() {
long long n;
cin >> n;
vector<long long> a[100001];
for (long long i = 0; i < n - 1; i++) {
long long x, y;
cin >> x >> y;
a[x].push_back(y);
a[y... |
#include <bits/stdc++.h>
using namespace std;
void fast(string name = "") {
ios_base::sync_with_stdio(0);
cin.tie(0);
if ((int)name.size() > 0) {
freopen((name + ".in").c_str(), "r", stdin);
freopen((name + ".out").c_str(), "w", stdout);
}
}
const int N = 1e5;
int deg[N];
int n;
void solve() {
cin >> ... |
#include <bits/stdc++.h>
using namespace std;
long long bigmod(long long b, long long p, long long md) {
if (p == 0) return 1;
if (p % 2 == 1) {
return ((b % md) * bigmod(b, p - 1, md)) % md;
} else {
long long y = bigmod(b, p / 2, md);
return (y * y) % md;
}
}
int deg[100005];
int main() {
int n;... |
#include <bits/stdc++.h>
using namespace std;
const int N = 500010;
int n, m, d[N];
inline int read() {
int sym = 0, res = 0;
char ch = 0;
while (!isdigit(ch)) sym |= (ch == '-'), ch = getchar();
while (isdigit(ch)) res = (res << 3) + (res << 1) + (ch ^ 48), ch = getchar();
return sym ? -res : res;
}
void fil... |
#include <bits/stdc++.h>
using namespace std;
long long ar[100005], n, flag;
int main() {
cin >> n;
for (int i = 0; i < n - 1; i++) {
long long l, r;
cin >> l >> r;
ar[l]++;
ar[r]++;
}
for (int i = 0; i < n + 1; i++)
if (ar[i] == 2) flag = 1;
if (!flag)
cout << "YES";
else
cout <... |
#include <bits/stdc++.h>
using namespace std;
bool b2(const pair<pair<int, int>, int> &p1,
const pair<pair<int, int>, int> &p2) {
return p1.first.first > p2.first.first;
}
bool b1(const pair<pair<int, int>, int> &p1,
const pair<pair<int, int>, int> &p2) {
return p1.first.second < p2.first.second;
}
... |
#include <bits/stdc++.h>
using namespace std;
const long long int inf = 1e18, M = 1e9 + 7;
const long long int N = 1e5 + 5;
vector<long long int> v[N];
void solve() {
long long int n;
cin >> n;
long long int a, b;
for (long long int i = 1; i < n; ++i) {
cin >> a >> b;
v[a].push_back(b);
v[b].push_ba... |
#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
cin >> n;
vector<int> a(n + 1);
int u, v;
for (int i = 0; i < n - 1; i++) {
cin >> u >> v;
a[u]++;
a[v]++;
}
bool check = false;
for (int i = 1; i <= n; i++)
if (a[i] == 2) check = true;
if (check)
cout << "NO";
el... |
#include <bits/stdc++.h>
using namespace std;
vector<int> v[100005];
int main() {
int t, q, n, m, x, y, i, j, k;
scanf("%d", &n);
for (i = 1; i < n; i++) {
scanf("%d%d", &x, &y);
v[x].push_back(y);
v[y].push_back(x);
}
int f = 0;
for (i = 1; i <= n; i++) {
if (v[i].size() == 2) {
f = 1... |
#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
cin >> n;
int a, b;
vector<vector<int>> A(n);
for (int i = 0; i < (n - 1); i++) {
cin >> a >> b;
A[a - 1].push_back(b - 1);
A[b - 1].push_back(a - 1);
}
if (n <= 2) {
cout << "YES" << endl;
return 0;
}
bool flag = fa... |
#include <bits/stdc++.h>
using namespace std;
vector<int> N[100005];
void addE(int a, int b) {
N[a].push_back(b);
N[b].push_back(a);
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int n, a, b;
cin >> n;
for (int i = 1; i < n; i++) {
cin >> a >> b;
addE(a - 1, b - 1);
... |
#include <bits/stdc++.h>
using namespace std;
template <typename Arg1>
void __f(const char* name, Arg1&& arg1) {
std::cerr << name << " : " << arg1 << '\n';
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args) {
const char* comma = strchr(names + 1, ',');
std::cerr... |
#include <bits/stdc++.h>
using namespace std;
void solve();
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
srand(time(0));
solve();
return 0;
}
long long max(long long a, long long b) {
if (a > b) return a;
return b;
}
long long min(long long a, long long b) {
if (a < b) return a;
re... |
#include <bits/stdc++.h>
using namespace std;
vector<vector<long long int>> graph;
int solve() {
long long int n;
cin >> n;
graph.resize(n + 1);
n--;
while (n--) {
long long int a, b;
cin >> a >> b;
graph[a].push_back(b);
graph[b].push_back(a);
}
long long int flag = 0;
for (auto adj : g... |
#include <bits/stdc++.h>
using namespace std;
int n;
vector<int> G[100005];
int main() {
scanf("%d", &n);
for (int i = 1; i <= n - 1; i++) {
int u, v;
scanf("%d %d", &u, &v);
G[u].push_back(v);
G[v].push_back(u);
}
for (int i = 1; i <= n; i++)
if (G[i].size() == 2) {
printf("NO\n");
... |
#include <bits/stdc++.h>
using namespace std;
void err(istream_iterator<string> it) {}
template <typename S37, typename... Args>
void err(istream_iterator<string> it, S37 a, Args... args) {
cerr << *it << " = " << a << endl;
err(++it, args...);
}
const long long N = 200010, mod = 1e9 + 7, mod2 = 1e9 + 9, mod3 = 998... |
#include <bits/stdc++.h>
using namespace std;
long long power(long long x, long long y, long long p) {
long long res = 1;
x = x % p;
while (y > 0) {
if (y & 1) res = (res * x) % p;
y = y >> 1;
x = (x * x) % p;
}
return res;
}
const int N = 1e5 + 7;
const int xinc[] = {0, 0, 1, -1};
const int yinc[... |
#include <bits/stdc++.h>
using namespace std;
using namespace std;
vector<int> conn[200100];
bool oka = true;
void dfs(int u, int par) {
if (par == -1 && conn[u].size() == 1)
;
else {
if (conn[u].size() == 1) return;
if (conn[u].size() < 3 || oka == false) {
oka = false;
return;
}
}
... |
#include <bits/stdc++.h>
using namespace std;
const int N = (int)1e5 + 10;
int n;
vector<int> vs[N];
bool dfs(int node, int par) {
if (par != -1 && vs[node].size() == 1) {
return false;
}
int children = 0;
bool bad = false;
for (int v : vs[node])
if (v != par) {
++children;
bad |= dfs(v, n... |
#include <bits/stdc++.h>
using namespace std;
using namespace std::chrono;
long long mod = 1000000007;
const int MX = 0x3f3f3f;
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n, i, u, v;
cin >> n;
vector<int> adj[n];
for (i = 0; i <= n - 2; i++) {
cin >> u >> v;
adj[u - 1].empl... |
#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e5 + 5;
int de[maxn];
int main() {
ios::sync_with_stdio(false);
int n;
cin >> n;
memset(de, 0, sizeof de);
for (int i = 0; i < n - 1; i++) {
int u, v;
cin >> u >> v;
de[u]++;
de[v]++;
}
bool flag = true;
for (int i = 1; i <=... |
#include <bits/stdc++.h>
using namespace std;
int const maxn = 1e5 + 5;
vector<int> p[maxn];
int main() {
int n;
scanf("%d", &n);
int u, v;
for (int i = 1; i < n; i++) {
scanf("%d%d", &u, &v);
p[u].push_back(v);
p[v].push_back(u);
}
bool flag = 1;
for (int i = 1; i <= n; i++)
if (p[i].size... |
#include <bits/stdc++.h>
using namespace std;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
long long int n, i, flag = 0, x, y;
cin >> n;
long long int a[200005];
for (i = 1; i <= n; i++) {
a[i] = 0;
}
for (i = 1; i < n; i++) {
cin >> x >> y;
a[x]++;
a[y]++;
}
for (i ... |
#include <bits/stdc++.h>
using namespace std;
const long long N = 2e5 + 7;
int d[N];
int main() {
int n;
scanf("%d", &n);
for (int i = 1, u, v; i < n; i++) {
scanf("%d%d", &u, &v);
d[u]++, d[v]++;
}
bool flag = true;
for (int i = 1; i <= n; i++) {
if (d[i] == 2) flag = false;
}
if (flag)
... |
#include <bits/stdc++.h>
using namespace std;
const int limit = 1000000;
int n;
vector<int> g[limit];
int main() {
ios::sync_with_stdio(false);
cin >> n;
for (int i = 0; i < n - 1; i++) {
int u, v;
cin >> u >> v;
g[u].push_back(v);
g[v].push_back(u);
}
for (int u = 1; u <= n; u++) {
vector... |
#include <bits/stdc++.h>
const double eps = 1e-7;
using namespace std;
int n;
int deg[100010];
int main() {
while (~scanf("%d", &n)) {
int a = 0, b = 0;
memset(deg, 0, sizeof(deg));
for (int i = 0; i < n - 1; ++i) {
scanf("%d%d", &a, &b);
deg[a] += 1;
deg[b] += 1;
}
bool isOk = 1... |
#include <bits/stdc++.h>
using namespace std;
int a[100006];
int main(void) {
int n, x, y;
cin >> n;
for (int i = 1; i < n; i++) cin >> x >> y, a[x]++, a[y]++;
for (int i = 1; i <= n; i++)
if (a[i] == 2) {
cout << "NO";
return 0;
}
cout << "YES";
}
|
#include <bits/stdc++.h>
using namespace std;
int main() {
int n;
cin >> n;
unordered_map<int, int> m;
for (int i = 0; i < n - 1; i++) {
int a, b;
cin >> a >> b;
m[a]++;
m[b]++;
}
for (int i = 1; i <= n; i++) {
if (m[i] == 2) {
cout << "NO";
return 0;
}
}
cout << "YES... |
#include <bits/stdc++.h>
using namespace std;
const long long maxN = 2 * 100224;
struct BIT {
long long data[maxN] = {0};
void update(long long idx, long long val) {
while (idx < maxN) {
data[idx] += val;
idx += idx & -idx;
}
}
void update(long long l, long long r, long long val) {
updat... |
#include <bits/stdc++.h>
using namespace std;
int const maxn = 1e6 + 5;
long long tree[4 * maxn], lazy[4 * maxn], a[maxn];
int kq[maxn];
int n;
void down(int g) {
if (lazy[g] != 0) {
tree[g << 1] += lazy[g];
lazy[g << 1] += lazy[g];
tree[(g << 1) | 1] += lazy[g];
lazy[(g << 1) | 1] += lazy[g];
laz... |
#include <bits/stdc++.h>
using namespace std;
long long n, a[500001], f[500001], ans[500001], mn;
int lowbit(int x) { return x & (-x); }
void ins(long long x, long long w) {
long long i;
for (i = x; i <= n; i += lowbit(i)) f[i] += w;
}
long long query(long long x) {
long long xlh = 0, i;
for (i = x; i; i -= low... |
#include <bits/stdc++.h>
using namespace std;
long long int ar[4 * 200005];
void update(int a, int b, int l, int h, int p) {
if (a < l || a > h) return;
if (l == h) {
ar[p] += b;
return;
}
int m = (l + h) / 2;
update(a, b, l, m, 2 * p);
update(a, b, m + 1, h, 2 * p + 1);
ar[p] += b;
return;
}
in... |
#include <bits/stdc++.h>
using namespace std;
const long long MAX = 200100;
pair<long long, long long> tree[256 * 1024 * 2];
long long lazy[256 * 1024 * 2];
void updateRangeUtil(long long si, long long ss, long long se, long long us,
long long ue, long long diff) {
if (lazy[si] != 0) {
tree[s... |
#include <bits/stdc++.h>
using namespace std;
const int maxn = 2e5 + 10;
const int maxm = 4e6 + 10;
const long long mod = 1e9 + 7;
const int inf = 0x3ffffff;
const double eps = 1e-5;
long long n, s[maxn];
long long a[maxn], ans[maxn << 2], tag[maxn << 2], m;
long long res[maxn];
inline void push_up(long long p) { ans[p... |
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll P[200001];
ll sum[200001];
ll fen[200001];
int ans[200001];
void build() {
for (int i = 1; i <= 200000; i++) {
sum[i] = sum[i - 1] + ll(i - 1);
fen[i] = sum[i] - sum[i - (i & -i)];
}
}
ll query(int l, int r) {
if (l != 1LL) return quer... |
#include <bits/stdc++.h>
using namespace std;
long long read() {
char ch = getchar();
long long x = 0, ff = 1;
while (ch < '0' || ch > '9') {
if (ch == '-') ff = -ff;
ch = getchar();
}
while (ch >= '0' && ch <= '9') x = x * 10 + ch - '0', ch = getchar();
return x * ff;
}
void write(long long aa) {
... |
#include <bits/stdc++.h>
using namespace std;
const int M = 2e5 + 5;
int p[M << 2], res[M];
long long V[M << 2], tag[M << 2];
void push_up(int o) {
if (V[o << 1] < V[o << 1 | 1]) {
V[o] = V[o << 1];
p[o] = p[o << 1];
} else {
V[o] = V[o << 1 | 1];
p[o] = p[o << 1 | 1];
}
}
void push_down(int o) {
... |
#include <bits/stdc++.h>
using namespace std;
const int maxn = 2e5 + 10;
int ans[maxn];
int n;
long long a[maxn];
const int maxnode = maxn << 2;
long long sum[maxnode], add[maxnode];
struct Node {
int l, r;
int mid() { return (l + r) >> 1; }
} node[maxnode];
void Pushup(int rt) { sum[rt] = sum[rt << 1] + sum[rt << ... |
#include <bits/stdc++.h>
using namespace std;
const long long MAXN = 2e5 + 10;
const long long INF = 0x3f3f3f3f;
const long long LLINF = 0x3f3f3f3f3f3f3f3f;
const long long MOD = 1e9 + 7;
long long segtree[MAXN << 2];
long long lazy[MAXN << 2];
long long arr[MAXN];
long long ans[MAXN];
void pushup(long long rt) {
seg... |
#include <bits/stdc++.h>
using namespace std;
long long b[200005];
int n;
long long sum(long long x) {
if (x == 0) {
return 0;
}
long long pas = 0;
while (x > 0) {
pas += b[x];
x = x & (x - 1);
}
return pas;
}
void update(long long x, long long i) {
while (i <= n) {
b[i] += x;
i += (i ... |
#include <bits/stdc++.h>
using namespace std;
const int N = 200010;
int n, p[N];
long long a[N], tr[N << 2];
void build(int k, int l, int r) {
if (l == r) {
tr[k] = l;
return;
}
int mid = l + r >> 1;
build(k << 1, l, mid);
build(k << 1 | 1, mid + 1, r);
tr[k] = tr[k << 1] + tr[k << 1 | 1];
}
void ad... |
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pll = pair<int, int>;
using ld = long double;
using pii = pair<int, int>;
using dbl = long double;
using vll = vector<int>;
#pragma GCC optimize("O2")
#pragma GCC optimize("unroll-loops")
const ll mod = 1000000007;
const ll N = 2e5 + 10;
const ll... |
#include <bits/stdc++.h>
using namespace std;
long long int fen[200005];
void upd(long long int x, long long int a) {
for (long long int i = x; i < 200005; i += (i & (-i))) {
fen[i] += a;
}
}
long long int ret(long long int x) {
long long int o = 0;
for (long long int i = x; i > 0; i -= (i & (-i))) {
o ... |
#include <bits/stdc++.h>
using namespace std;
const long long MAXN = 200100;
const long long INF = 2000000100;
const long long MOD = 998244353;
long long N, S[MAXN], P[MAXN];
long long B[MAXN];
void update(int ind, long long v) {
for (int i = ind; i <= N; i += (i & -i)) {
B[i] += v;
}
}
long long query(int ind)... |
#include <bits/stdc++.h>
using namespace std;
struct node {
int64_t data, lazy;
int pos;
};
node st[200001 * 4];
int64_t input[200001];
int anw[200001];
void output(int root, int L, int R) {
if (L == R) {
return;
}
int mid = (L + R) >> 1;
output(root << 1, L, mid);
output(root << 1 | 1, mid + 1, R);
}... |
#include <bits/stdc++.h>
using namespace std;
const long long N = 2e5 + 10, Max = 101;
const int MOD = 1000000007;
const long long OO = 2e12 + 5000;
const long long Sqrt = 710;
const double PI = acos(-1);
const double EPS = 1e-9;
int n;
long long a[N];
pair<long long, long long> seg[4 * N];
long long lazy[8 * N];
void ... |
#include <bits/stdc++.h>
using namespace std;
const long long MOD = 1e9 + 7;
class {
public:
pair<long long, long long> T[200009 << 2];
long long lz[200009 << 2];
long long n, f[200009], ans[200009];
void solve() {
cin >> n;
for (int i = 1; i <= n; ++i) cin >> f[i];
build(1, 1, n);
for (int i =... |
#include <bits/stdc++.h>
#pragma comment(linker, "/STACK:102400000,102400000")
using namespace std;
const long long inf = 1000000000000;
const int N = 200005;
const long long LLMAX = 2e18;
const long long MOD = 1000000009ll;
const double eps = 1e-8;
const int MAXN = 1e6 + 10;
int gcd(int a, int b) { return b == 0 ? a :... |
#include <bits/stdc++.h>
using namespace std;
const int MOD = 1000000007;
const int INF = 2e9;
const long long INFLL = 1e18;
const int MAX_N = 1;
int N;
vector<long long> v;
struct SEG {
struct NODE {
int l, r;
long long data;
};
vector<NODE> seg;
int SZ;
void add() { seg.push_back((NODE){-1, -1, (lon... |
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