func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, m, x, y, a, b, t;   long long q[55][55];   long long g[55][55];   int main() {     cin >> n >> m;     for (int i = 1; i <= n; i++)       for (int j = 1; j <= m; j++) cin >> q[i][j];     for (int i = 1; i <= n; i++)       for (int j = 1; j <= m; j++) {         cin >> g[i][j];         if (g[i][j] < q[i][j]) swap(g[i][j], q[i][j]);         if (q[i][j] <= q[i - 1][j] || q[i][j] <= q[i][j - 1]) t = 1;         if (g[i][j] <= g[i - 1][j] || g[i][j] <= g[i][j - 1]) t = 1;       }     if (t == 1)       cout <<  Impossible ;     else       cout <<  Possible ;     return 0;   }   