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#include<cstdlib>
int qwerty_getcode(int code) {
return code == 42? 0: 1;
}
namespace std {
void qwerty_exit(int code){
exit(qwerty_getcode(code));
}
} using std::qwerty_exit;
#define exit qwerty_exit
#define main qwerty_main
#include "testlib.h"
#include <string>
#include <vector>
int main(int argc, char **argv) {
registerTestlibCmd(argc, argv);
int n = inf.readInt();
std::string s = inf.readWord();
std::vector<int> prefix_sums(2 * n, 0);
for (int i = 0; i < 2 * n - 1; ++i) {
prefix_sums[i + 1] = prefix_sums[i] + int(s[i] == 'W');
}
int x = ouf.readInt(0, 2 * n - 1, "x");
int cnt = 0;
int l = 0, r;
for (r = 0; r < 2 * n - 1 && prefix_sums[r + 1] < x; ++r);
while (cnt < n && r < 2 * n - 1) {
while (prefix_sums[r + 1] - prefix_sums[l] > x) ++l;
for (
int i = l;
cnt < n
&& r - i + 1 >= n
&& prefix_sums[r + 1] - prefix_sums[i] == x;
++i
) { ++cnt; }
++r;
}
if (cnt == n) quitf(_ok, "At least n intervals");
else quitf(_wa, "Not enough intervals");
return 0;
}
#undef main
#include<cstdio>
#include<vector>
#include<string>
#include<filesystem>
int main(int argc, char **argv) {
namespace fs = std::filesystem;
freopen(argv[2], "r", stdin);
char judge_out[] = "/dev";
std::vector<char*> new_argv = {
argv[0], argv[1], argv[3],
judge_out,
};
return qwerty_getcode(qwerty_main((int)new_argv.size(), new_argv.data()));
}
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