HackerRank set vector

// Example program
#include <iostream>
#include <string>
#include <set>
#include <vector>
#include <algorithm>

using namespace std;
int sockMerchant(int n, vector<int> ar) {
    vector<int> vect;
    int counter = 0;
    for(int i =0; i <n ; i++)
    {
        //cout << i << " " << ar[i] << endl;
        /*
        if(count(vect.begin(), vect.end(), ar[i]) ==2)
        {
            counter++;

        }
        */
            vect.push_back(ar[i]);

    }
    set<int> s1;
    for(int i =0; i <n ; i++)
    {
           int number =  vect[i];
           int times = count(vect.begin(), vect.end(), ar[i]);
           cout << i << " " << number << " " << times << " " << counter <<endl;
            if(count(s1.begin(), s1.end(), ar[i]) ==0)
            {
                   counter += times/2;

            }
            s1.insert(vect[i]);

    }

    return counter;
}

int main()
{
 /* vector <int> v1 { 10, 20, 20, 10, 10, 30, 50, 10, 20 };
 int res =   sockMerchant(9, v1);.
 */
 sockMerchant(
  cout << res << endl;
}