func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[51][51], b[51][51];   int main() {     int n, m;     cin >> n >> m;     for (int i = 1; i <= n; i++) {       for (int j = 1; j <= m; j++) {         cin >> a[i][j];       }     }     for (int i = 1; i <= n; i++) {       for (int j = 1; j <= m; j++) {         cin >> b[i][j];         if (a[i][j] > b[i][j]) {           int temp;           temp = a[i][j];           a[i][j] = b[i][j];           b[i][j] = temp;         }       }     }     for (int i = 1; i <= n; i++) {       for (int j = 2; j <= m; j++) {         if (a[i][j] <= a[i][j - 1] || b[i][j] <= b[i][j - 1]) {           cout <<  Impossible  << endl;           return 0;         }       }     }     for (int j = 1; j <= m; j++) {       for (int i = 2; i <= n; i++) {         if (a[i][j] <= a[i - 1][j] || b[i][j] <= b[i - 1][j]) {           cout <<  Impossible  << endl;           return 0;         }       }     }     cout <<  Possible  << endl;     return 0;   }   