Leimasin

input/code.cpp: In function 'int main()':
input/code.cpp:24:57: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   24 |     while (!st.empty() && st.begin()->second + s.size() <= i) {
      |                           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~

#include <bits/stdc++.h>

typedef long long ll;

using namespace std;

int main() {
  int n, m, k;
  cin >> n >> m >> k;
  string s;
  cin >> s;
  vector<int> v[n + 1];
  for (int i = 0; i < k; i++) {
    int L;
    cin >> L;
    v[L].push_back(i);
  }
  string ans;
  set<pair<int, int>> st;
  for (int i = 1; i <= n; i++) {
    for (auto u : v[i]) {
      st.insert({-u, i});
    }
    while (!st.empty() && st.begin()->second + s.size() <= i) {
      st.erase(st.begin());
    }
    if (st.empty())
      ans.push_back('.');
    else
      ans.push_back(s[i - (st.begin()->second)]);
  }
  cout << ans;
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

Test 5

Group: 2, 3

Verdict: ACCEPTED

Test 6

Group: 2, 3

Verdict: ACCEPTED

Test 7

Group: 2, 3

Verdict: ACCEPTED

Test 8

Group: 2, 3

Verdict: ACCEPTED

Test 9

Group: 3

Verdict: ACCEPTED

Test 10

Group: 3

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED