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
signed main(){
int n; cin >> n;
string s; cin >> s;
int ans=0;
for(int i=0; i<n; i++){
int id=i+1;
while(s[id]!=s[i]) id++;
for(int j=id; j<i+n; j++) swap(s[j],s[j+1]), ans++;
}
cout << ans << '\n';
}
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