Counting ones

#include <iostream>
#include <vector>
#include <array>
#include <string>
#include <algorithm>
#include <numeric>
#include <unordered_map>
#include <unordered_set>
#include <queue>
#include <climits>
#include <cmath>
#include <functional>
#include <type_traits>
 
#define int long long
using namespace std;

void solve() {
    int n;
    cin >> n;
 
    vector<int> vec(n);
    for (int i = 0; i < n; i++)
        cin >> vec[i];
    
    int a, b;
    int c = -1;

    for (int i = 0; i < n; i++)
    {
        for (int j = i+1; j < n; j++)
        {
            int k = __builtin_popcountll(vec[i] * vec[j]);
            if (k > c)
            {
                a = vec[i];
                b = vec[j];
                c = k;
            }
        }
    }
    cout << c << '\n' << a << ' ' << b;
}
 
 
signed main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
 
    int t = 1;
 
    //cin >> t;
 
    for (int i = 0; i < t; i++)
        solve();
 
    return 0;
}

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