func_code_string: #include <bits/stdc++.h>   using namespace std;   bool isSafe(const int n, const int m, const int row, const int col) {     return row >= 0 && row < n && col >= 0 && col < m;   }   int main(int argc, char* argv[]) {     int n, m;     static pair<int, int> pos[] = {{-1, -1}, {-1, 0}, {-1, 1}, {0, -1}, {0, 0},                                    {0, 1},   {1, -1}, {1, 0},  {1, 1}};     int posLen = sizeof(pos) / sizeof(pos[0]);     cin >> n >> m;     vector<string> vec(n);     for (int i = 0; i < n; i++) {       cin >> vec[i];     }     for (int i = 0; i < n; i++) {       for (int j = 0; j < m; j++) {         int count = 0;         if (vec[i][j] ==  * ) {           continue;         }         for (int k = 0; k < posLen; k++) {           if (isSafe(n, m, i + pos[k].first, j + pos[k].second) &&               vec[i + pos[k].first][j + pos[k].second] ==  * ) {             count++;           }         }         if ((count == 0 && vec[i][j] !=  . ) ||             (count != 0 && count != vec[i][j] -  0 )) {           cout <<  NO ;           return 0;         }       }     }     cout <<  YES ;     return 0;   }   