Submission #1541137

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Source Code Expand

#include<iostream>
#include<algorithm>
#include<cstdio>
#include<functional>
#include<vector>
#include<map>
#include<string>
#include<set>
#include<unordered_set>
#include<unordered_map>
#define int long long
using namespace std;

int a[26];
signed main(){
	int ans = 1;
	string b; cin >> b;
	for (char c : b) {
		a[c - 'a'] ++;
	}
	int sum = b.length();
	for (int i = 0; i < 26; i++) {
		sum -= a[i];
		ans += a[i] * sum;
	}
	cout << ans << endl;
	getchar();
}

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