func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(nullptr);     int n, m;     cin >> n >> m;     int a[n][m], b[n][m];     for (int i = 0; i < n; ++i)       for (int j = 0; j < m; ++j) cin >> a[i][j];     for (int i = 0; i < n; ++i)       for (int j = 0; j < m; ++j) cin >> b[i][j];     for (int i = 0; i < n; ++i)       for (int j = 0; j < m; ++j)         if (a[i][j] > b[i][j]) swap(a[i][j], b[i][j]);     bool pass = true;     for (int i = 0; i < n - 1; ++i)       for (int j = 0; j < m - 1; ++j) {         if (a[i][j] >= a[i + 1][j] || a[i][j] >= a[i][j + 1] ||             b[i][j] >= b[i + 1][j] || b[i][j] >= b[i][j + 1])           pass = false;       }     for (int i = 0; i < m - 1; ++i)       if (a[n - 1][i] >= a[n - 1][i + 1] || b[n - 1][i] >= b[n - 1][i + 1])         pass = false;     for (int i = 0; i < n - 1; ++i)       if (a[i][m - 1] >= a[i + 1][m - 1] || b[i][m - 1] >= b[i + 1][m - 1])         pass = false;     pass ? puts( Possible ) : puts( Impossible );   }   