func_code_string: #include <bits/stdc++.h>   using namespace std;   vector<string> v;   int main(void) {     int n;     scanf( %d , &n);     for (int i = 0; i < n; i++) {       char s[50];       scanf( %s , &s);       v.push_back((string)s);     }     int res = 0;     while (true) {       int ok = 1;       for (int i = 0; i < n; i++)         if (v[i][res] != v[0][res]) {           printf( %d n , res);           return 0;         }       res++;     }     printf( %d n , res);     return 0;   }   