P25401: Quants de diferents?

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;


void read_vector(vector<int>& v) {
    int tam = v.size();
    for (int i = 0; i < tam; ++i) {
        cin >> v[i];
    }
}


int main() {
    int n;
    while (cin >> n) {
        vector<int> v(n);
        read_vector(v);
        sort(v.begin(), v.end());
        int comp = v[0];
        int count = 1;
        for (int i = 0; i < n; ++i) {
            if (v[i] != comp) {
                ++count;
                comp = v[i];
            }
        }
        cout << count << endl;
    }
}

//JosepRivaille