Counting ones

#include <algorithm>
#include <iostream>
#include <queue>
#include <vector>

using namespace std;

int main() {
    int n;
    cin >> n;
    vector<long long int> v(n);
    for (int i = 0; i < n; i++)
    {
        cin >> v[i];
    }

    long long int max = -1;

    int a = 0, b = 0;
    for (int i = 0; i < n; i++)
    {
        for (int j = i; j < n; j++)
        {
            long long int x = v[i] * v[j];
            if (i != j and __builtin_popcountll(x) > max) {
                a = i; b = j; max = __builtin_popcountll(x);
            }
        }
        
    }


    cout << max << endl;
    cout << v[a] <<  ' ' << v[b] << endl;
    
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED