This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int long long int
#define float long double
const int INF=1e18;
inline void solve(){
int n;cin>>n;
int ans=0;
string s;cin>>s;
for(int i=0;i<n;i++){
if(i==0)ans++;
else if(i==1)ans+=1+(s[0]!=s[1]);
set<char> ss;ss.insert(s[i]);
ss.insert(s[i-1]);ss.insert(s[i-2]);
ans+=ss.size();
}
cout<<ans;
}
signed main(){
cin.tie(0)->sync_with_stdio(false);
int t=1;//cin>>t;
while(t--){
solve();
}
}
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