cses Distinct Numbers

#include "bits/stdc++.h"

const int max = 1000000007;

int main()
{
    int n, counter = 0;
    std::cin >> n;


    std::vector<int> values(n);

    for (int i = 0; i < n; i++)
    {
        std::cin >> values[i];
    }

    std::sort(values.begin(), values.end());

    for (int i = 0; i < n - 1; i++)
    {

        if (values[i] != values[i + 1])
        {
            counter++;
        }
    }

    std::cout << ++counter;
    return 0;
}