func_code_string: #include <bits/stdc++.h>   const long long INF = (long long)1e18 + 2;   using namespace std;   void solve();   void fastIO() {     ios::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);   }   int main() {     fastIO();     solve();   }   void solve() {     int n, m;     cin >> n >> m;     char a[n][m];     for (int i = 0; i < n; i++)       for (int j = 0; j < m; j++) cin >> a[i][j];     int rs = 200, re = -1, cs = 200, ce = -1;     bool flag = true;     for (int i = 0; i < n; i++) {       for (int j = 0; j < m; j++) {         if (a[i][j] ==  B ) {           if (i < rs) rs = i;           if (i > re) re = i;           if (j < cs) cs = j;           if (j > ce) ce = j;           flag = false;         }       }     }     if (flag) {       cout << 1;       return;     }     int x = re - rs + 1;     int y = ce - cs + 1;     int mx = max(x, y);     if (n < mx || m < mx) {       cout << -1;       return;     }     int ans = 0;     for (int i = 0; i < n; i++) {       for (int j = 0; j < m; j++) {         if (a[i][j] ==  B ) ans++;       }     }     cout << (mx * mx - ans);   }   