func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 1e6 + 100;   char s[N];   int cost(char a, char b) { return min(abs(b - a), 26 - abs(b - a)); }   int main() {     int ans = 1e9;     int n;     cin >> n;     scanf( %s , s + 1);     for (int i = 1; i <= n; i++) {       int j = i + 1, k = j + 1, t = k + 1;       if (t > n) continue;       ans = min(ans, cost(s[i],  A ) + cost(s[j],  C ) + cost(s[k],  T ) +                          cost(s[t],  G ));     }     cout << ans;   }   