func_code_string: #include <bits/stdc++.h>   using namespace std;   const int Max = 50;   int row[Max][Max] = {0}, dp[Max][Max][Max][Max] = {0}, a[Max][Max];   int main() {     int n, m, q;     cin >> n >> m >> q;     for (int i = 1; i <= n; i++) {       for (int j = 1; j <= m; j++) {         scanf( %1d , &a[i][j]);         row[i][j] = row[i][j - 1] + 1;         if (a[i][j] == 1) row[i][j] = 0;       }     }     for (int i = 1; i <= n; i++) {       for (int j = 1; j <= m; j++) {         for (int k = i; k <= n; k++) {           for (int l = j; l <= m; l++) {             dp[i][j][k][l] =                 dp[i][j][k - 1][l] + dp[i][j][k][l - 1] - dp[i][j][k - 1][l - 1];             int r = l - j + 1;             for (int z = k; z >= i; z--) {               r = min(r, row[z][l]);               dp[i][j][k][l] += r;             }           }         }       }     }     while (q--) {       int a, b, c, d;       scanf( %d%d%d%d , &a, &b, &c, &d);       cout << dp[a][b][c][d] << endl;     }     return 0;   }   