func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 2002;   int a[N][N] = {0}, b[N][N] = {0};   int c[N] = {0}, d[N] = {0}, e[N] = {0}, f[N] = {0};   int main() {     int n, m, ans = 0;     cin >> n >> m;     for (int i = 1; i <= n; i++) {       for (int j = 1; j <= m; j++) {         cin >> a[i][j];         b[i][j] = a[i][j];         if (a[i][j] == 0) {           if (c[i] == 1) ans++;           if (d[j] == 1) ans++;         } else {           c[i] = 1, d[j] = 1;         }       }     }     for (int i = n; i >= 1; i--) {       for (int j = m; j >= 1; j--) {         if (b[i][j] == 0) {           if (e[i] == 1) ans++;           if (f[j] == 1) ans++;         } else {           e[i] = 1, f[j] = 1;         }       }     }     cout << ans << endl;   }   