Submission #2388209

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Source Code Expand

#include<iostream>
#include<vector>
#include<queue>
#include<deque>
#include<stack>
#include<cstdio>
#include<utility>
#include<algorithm>
using std::cout;
using std::cin;
using std::endl;

int main(void){
    std::string s;
    cin >> s;
    int answer = s.size() * (s.size() - 1) / 2 + 1;
    //cout << "first answer:" << answer << endl;

    for (char i = 'a'; i <= 'z'; i++)
    {
        int count = 0;
        for (auto itr : s)
        {
            if(itr==i){
                count++;
            }
        }
        answer -= count * (count - 1) / 2;
    }
    cout << answer << endl;

    return 0;
}

Submission Info

Judge Result