func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 1e5 + 5, MOD = 1e9 + 7;   int main() {     vector<int> a(27, -1), b(27, -1), c(27, -1);     string str;     cin >> str;     for (int i = 0; i < (int)str.size(); i++) {       if (a[str[i] -  a ] == -1) {         a[str[i] -  a ] = i;         c[str[i] -  a ] = i;       } else {         b[str[i] -  a ] = max(i - a[str[i] -  a ], b[str[i] -  a ]);         a[str[i] -  a ] = i;       }     }     int x = (int)str.size() - 1;     int ans = (int)str.size() / 2 + 1;     for (int i = 0; i < 27; i++) {       if (b[i] != -1) {         b[i] = max({b[i], x - a[i] + 1, c[i] + 1});         ans = min(b[i], ans);       }     }     cout << ans << endl;     return 0;   }   