func_code_string: #include <bits/stdc++.h>   using namespace std;   string s[51];   int n, m;   bool check(int i, int j) {     for (int k = 1; k <= n; ++k)       if (s[k][j] ==  #  && s[k] != s[i]) return false;     return true;   }   signed main() {     ios::sync_with_stdio(false);     cin >> n >> m;     for (int i = 1; i <= n; ++i) cin >> s[i];     for (int i = 1; i <= n; ++i)       for (int j = 0; j <= m - 1; ++j)         if (s[i][j] ==  # )           if (!check(i, j)) {             cout <<  No ;             return 0;           }     cout <<  Yes ;     return 0;   }   