func_code_string: #include <bits/stdc++.h>   using namespace std;   string s[105];   int main() {     int n, m, cnt = 0, t, tt, temp, dis = 0, ans = 0, len;     int row = 0, rowup = 2e9, rowdn = -1, col = 0, collft = 2e9, colrt = -1;     int rowupcol, rowdncol, collftrow, colrtrow;     scanf( %d %d , &n, &m);     for (int i = 0; i < n; i++) cin >> s[i];     for (int i = 0; i < n; i++) {       for (int j = 0; j < m; j++) {         if (s[i][j] ==  B ) {           cnt++;           if (i < rowup) {             rowup = i;             rowupcol = j;           }           if (rowdn < i) {             rowdn = i;             rowdncol = j;           }           if (j < collft) {             collft = j;             collftrow = i;           }           if (colrt < j) {             colrt = j;             colrtrow = i;           }         }       }     }     if (!cnt)       printf( 1 n );     else if (cnt == 1)       printf( 0 n );     else {       len = max(rowdn - rowup + 1, colrt - collft + 1);       if (len > n || len > m)         printf( -1 n );       else         printf( %d n , (len * len) - cnt);     }     return 0;   }   