func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int gcd(long long int x, long long int y) {     if (y > x) {       return gcd(y, x);     }     if (y == 0) {       return x;     }     return gcd(y, x % y);   }   bool prime(long long int x) {     for (long long int i = 2; i <= sqrt(x); i++) {       if (x % i == 0) {         return 0;       }     }     return 1;   }   long long int fact(long long int n) {     if (n == 0) {       return 1;     }     return n * fact(n - 1);   }   void solve() {     long long int r, c;     cin >> r >> c;     long long int b = 1;     for (long long int i = 0; i < r; i++) {       if (i % 2 == 0) {         for (long long int j = 0; j < c; j++) cout <<  # ;         cout << endl;       } else {         if (b == 1) {           for (long long int j = 0; j < c - 1; j++) cout <<  . ;           cout <<  # ;           cout << endl;           b = 0;         } else {           cout <<  # ;           for (long long int j = 0; j < c - 1; j++) cout <<  . ;           cout << endl;           b = 1;         }       }     }   }   int32_t main() {     ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);     long long int t = 1;     while (t--) solve();     return 0;   }   