func_code_string: #include <bits/stdc++.h>   const int MaxN = 1000;   using namespace std;   char s[MaxN + 5];   int n;   int vis[200 + 5];   int main() {     while (~scanf( %d , &n)) {       scanf( %s , s + 1);       int Max = 0;       for (int i = 1; i <= n; i++) {         for (int j = i; j <= n; j++) {           memset(vis, 0, sizeof(vis));           int ans = 0;           bool ok = 1;           for (int k = i; k <= j; k++) {             if (s[k] >=  A  && s[k] <=  Z )               ok = 0;             else {               if (!vis[s[k]]) ans++, vis[s[k]] = 1;             }           }           if (ok) Max = max(Max, ans);         }       }       printf( %d n , Max);     }   }   