Submission #1540294

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Source Code Expand

#include <iostream>

using namespace std;

int main() {
    int bit[26];
    for(int i = 0;i < 26;i++) bit[i] = 0;
    string str;
    cin >> str;
    long long ans = 1;
    for(int i = 0;i < str.length();i++){
        int c = str[i] - 'a';
        for(int j = 0;j < 26;j++){
            if(c != j) ans += bit[j];
        }
        bit[c]++;
    }
    cout << ans << endl;
}

Submission Info

Judge Result