func_code_string: #include <bits/stdc++.h>   using namespace std;   int dx[] = {-1, 1, 0, 0, 0, 0, 0, 0};   int dy[] = {0, 0, 1, -1, 0, 0, 0, 0};   const int inf = 1000000000;   const double eps = 0.000000009;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     int n;     cin >> n;     string a[n];     for (int i = 0; i < n; i++) cin >> a[i];     long long ans = 7;     for (int i = 0; i < n; i++) {       for (int j = i + 1; j < n; j++) {         int diff = 0;         for (int k = 0; k < 6; k++) {           if (a[i][k] != a[j][k]) diff++;         }         ans = min(ans, (long long)ceil(diff / 2.0));       }     }     cout << ans - 1 << endl;     return 0;   }   