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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- int n;
- string s;
- cin>>n>>s;
- int ans=0;
- for(int i=1; i<=n-1; i++)
- {
- set<char> st(s.begin(),s.begin()+i),st1(s.begin()+i,s.end());
- int cnt=0;
- for(char i='a'; i<='z'; i++)
- if(st.count(i)&&st1.count(i))cnt++;
- ans=max(ans,cnt);
- }
- cout<<ans;
- }
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