Piva and Glasses

#include<iostream>
#include<vector>
#include<string>
using namespace std;
long long factorial(const int n)
{
    long long f = 1;
    for (long long i=1; i<=n; ++i)
        f *= i;
    return f;
}

int main(){
    string s;
    cin >> s;
    long long n = s.length();
    vector<long long> lletres (26,0);
    for(long long i = 0; i < n; ++i){
        char c = s[i];
        int act = c - 'a';
        ++lletres[act];
    }
    long long num_lletres = 0;

    num_lletres = factorial(n);
    for(int i = 0; i < 26; ++i){
        if(lletres[i]!= 0)
            num_lletres = num_lletres/(lletres[i]); 
    }
    cout<<num_lletres<<endl;
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: WRONG ANSWER

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: WRONG ANSWER

Test 16

Verdict: WRONG ANSWER

Test 17

Verdict: WRONG ANSWER

Test 18

Verdict: WRONG ANSWER

Test 19

Verdict: WRONG ANSWER

Test 20

Verdict: WRONG ANSWER

Test 21

Verdict: WRONG ANSWER

Test 22

Verdict: WRONG ANSWER

Test 23

Verdict: WRONG ANSWER

Test 24

Verdict: WRONG ANSWER

Test 25

Verdict: WRONG ANSWER

Test 26

Verdict: WRONG ANSWER

Test 27

Verdict: WRONG ANSWER

Test 28

Verdict: WRONG ANSWER

Test 29

Verdict: WRONG ANSWER

Test 30

Verdict: WRONG ANSWER