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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define ll long long
  4. #define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  5.  
  6. void solve() {
  7.     int n,mx=0;
  8.     string s; cin>>n>>s;
  9.     vector<int>freq1(26);
  10.     vector<int>freq2(26);
  11.     for(char it:s)
  12.         freq1[it-'a']++;
  13.     for(char it:s){
  14.         freq2[it-'a']++;
  15.         freq1[it-'a']--;
  16.         int c1=0,c2=0;
  17.         for(int i=0;i<26;i++){
  18.             if(freq1[i]) c1++;
  19.             if(freq2[i]) c2++;
  20.         }
  21.         mx=max(mx,c1+c2);
  22.     }
  23.     cout<<mx<<endl;
  24. }
  25.  
  26. int main() {
  27.     IOS;
  28.     int t=1;
  29.     cin >> t;
  30.     while(t--)solve();
  31. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/wvXGpv
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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