func_code_string: #include <bits/stdc++.h>   using namespace std;   int h, w, i, j, mod = 1e9 + 7, r, c, ans = 1, a[1001][1001];   int main() {     cin.tie(NULL);     ios_base::sync_with_stdio(0);     cin >> h >> w;     for (i = 0; i < h; i++) {       cin >> r;       for (j = 0; j < r; j++) a[i][j] = 2;       a[i][r] = 1;     }     for (i = 0; i < w; i++) {       cin >> c;       for (j = 0; j < c; j++)         if (a[j][i] == 1) {           cout << 0 << endl;           return 0;         } else           a[j][i] = 2;       if (a[c][i] == 2) {         cout << 0 << endl;         return 0;       }       a[c][i] = 1;     }     for (i = 0; i < h; i++)       for (j = 0; j < w; j++)         if (!a[i][j]) ans = (ans * 2) % mod;     cout << ans << endl;     return 0;   }   