func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int i, c = 0, j, x = 0, n;     cin >> n;     string s;     vector<string> ar;     for (i = 0; i < n; i++) {       cin >> s;       ar.push_back(s);     }     for (i = 0; i < ar[0].length(); i++) {       for (j = 0; j < n - 1; j++) {         if (ar[j][i] != ar[j + 1][i]) {           x = 1;           break;         }       }       if (x == 0)         c++;       else         break;     }     cout << c;     return 0;   }   