func_code_string: #include <bits/stdc++.h>   using namespace std;   using ll = long long;   void solve() {     int n, m;     cin >> n >> m;     vector<string> f(n);     for (int i = 0; i < n; ++i) {       cin >> f[i];     }     vector<int> v(m);     for (int j = 1; j < m; ++j) {       for (int i = 1; i < n; ++i) {         if (f[i - 1][j] ==  X  && f[i][j - 1] ==  X ) {           v[j] = 1;         }       }     }     for (int i = 1; i < m; ++i) {       v[i] += v[i - 1];     }     int q;     cin >> q;     for (int i = 0; i < q; ++i) {       int a, b;       cin >> a >> b;       if (v[b - 1] - v[a - 1] > 0) {         cout <<  NO n ;       } else {         cout <<  YES n ;       }     }   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(nullptr);     solve();   }   