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#include<bits/stdc++.h> using namespace std; #define int long long signed main(){ ios::sync_with_stdio(false); cin.tie(NULL); int n; cin >> n; string s; cin >> s; int out = 0; for(int i=n-3; i>=0; i--){ if(s[i]==s[i+1] && s[i]!=s[i+2]){ out += (n-2-i); } } cout << out << '\n'; }
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