func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long i, j, d = 0, e = 0, f = 0, sum = 0, c = 0, n;     cin >> n;     char a[4][4];     map<int, int> m;     for (i = 0; i < 4; i++) {       for (j = 0; j < 4; j++) {         cin >> a[i][j];       }     }     for (i = 0; i < 4; i++) {       for (j = 0; j < 4; j++) {         if (a[i][j] >= 49 && a[i][j] <= 57) {           m[a[i][j]]++;         }       }     }     for (auto x : m) {       if (x.second > (2 * n)) {         c++;       }     }     if (c == 0) {       cout <<  YES ;     } else       cout <<  NO ;   }   