vFkL8Q - Online C++0x Compiler & Debugging Tool

#include<bits/stdc++.h>
using namespace std;

#define ll long long

void solve(){
    string s;
    cin>>s;
    int n=s.size(),ans=0;
    for(int i=0;i<n;i++){
        unordered_map<char,int>mp;
        int mx=0;
        for(int j=i;j<n;j++){
            mp[s[j]]++;
            mx=max(mx,mp[s[j]]);
            if(mp.size()-mx>=0)ans++;
        }
    }
    cout<<ans<<"\n";
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    solve();
    return 0;
}