func_code_string: #include <bits/stdc++.h>   using namespace std;   const int inf = 2e9;   const int sz = 3;   const double eps = 1e-9;   const int maxn = 1e3 + 500, base = 1e9 + 7, maxm = 10;   string second[maxn];   int main() {     ios_base::sync_with_stdio(0);     ;     cin.tie(0);     int n;     cin >> n;     if (n == 1) {       cout << 6 << endl;       return 0;     }     int k = inf;     for (int i = 0; i < n; i++) cin >> second[i];     for (int i = 0; i < n; i++)       for (int j = i + 1; j < n; j++) {         int eq = 0;         for (int b = 0; b < 6; b++)           if (second[i][b] == second[j][b]) eq++;         if (eq == 0 || eq == 1) k = min(k, 2);         if (eq == 3 || eq == 2) k = min(k, 1);         if (eq >= 4) k = min(k, 0);       }     cout << k;   }   