Submission #1625459

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Source Code Expand

#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include <random>
#include<map>
#include <iomanip>
#include <time.h>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
#include <cassert>
#include<fstream>
#include <unordered_map>  
using namespace std;
#define eps 0.00000001
#define LONG_INF 10000000000000000
#define GOLD 1.61803398874989484820458
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
int main() {
	string s;
	cin >> s;
	long long ans = s.length();
	ans *= (long long)(s.length() + 1);
	ans /= (long long)2;
	ans++;
	map<int,long long> wow;
	for (int i = 0;i < s.length();++i) {
		wow[s[i] - 'a']++;
	}
	for (int i = 0;i < 26;++i) {
		ans -= wow[i] * (wow[i] + 1) / (long long)2;
	}
	cout << ans << endl;
	return 0;
}

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