func_code_string: #include <bits/stdc++.h>   using namespace std;   struct debugger {     static void call(const char* it) {}     template <typename T, typename... aT>     static void call(const char* it, T a, aT... rest) {       string b;       for (; *it && *it !=  , ; ++it)         if (*it !=    ) b += *it;       cerr << b <<  =  << a <<    ;       call(++it, rest...);     }   };   int dr[] = {0, 1, 1, -1, 0, -1, -1, 1};   int dc[] = {1, 0, 1, 1, -1, 0, -1, -1};   char field[4][4];   int dt = 0;   int tour(int r, int c, char c1, char c2, int d) {     if (r < 0 || r > 3 || c < 0 || c > 3) return 0;     if (field[r][c] == c2) {       dt++;       if (dt > 1) return 0;     } else if (field[r][c] != c1)       return 0;     int ans = 1;     ans += tour(r + dr[d], c + dc[d], c1, c2, d);     return ans;   }   int main() {     {       ios_base::sync_with_stdio(false);       cin.tie(NULL);       cout.tie(NULL);     };     for (int i = 0; i < 4; i++)       for (int j = 0; j < 4; j++) cin >> field[i][j];     int y = 0;     for (int i = 0; i < 4; i++) {       for (int j = 0; j < 4; j++) {         for (int k = 0; k < 4; k++) {           if (tour(i, j,  x ,  . , k) == 3) {             y = 1;             break;           }           dt = 0;         }         if (y) break;       }       if (y) break;     }     if (y)       cout <<  YES n ;     else       cout <<  NO n ;     return 0;   }   