Counting ones

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

// Debug printing
#ifdef DEBUG
#define deb(fmt, args...) printf("DEBUG: %d: " fmt, __LINE__, ##args)
#else
#define deb(fmt, args...)
#endif

void print_array(vector<int> in, const string title = "Vector")
{
	cout << title << " [\n";
	for (const auto &el : in) {
		cout << el << " ";
	}
	cout << "\n] END\n";
}

void print_matrix(vector<vector<int> > in, const string title = "Matrix")
{
	cout << title << "[\n";
	for (unsigned int i = 0; i < in.size(); i++) {
		for (unsigned int j = 0; j < in[i].size(); j++) {
			cout << in[i][j] << " ";
		}
		cout << "\n";
	}
	cout << "] END\n";
}

int main(int argc, char *argv[])
{
	ios::sync_with_stdio(0);
	cin.tie(0);

	// Read the input parameters
	int n;
	cin >> n;

	// Read values from one line
	vector<ll> input_line(n);
	// ll tmp;
	for (int i = 0; i < n; i++) {
		cin >> input_line[i];
		// cin >> tmp;
	}

	ll max = 0L;
	int first = 0, second = 1;
	for (int i = 0; i < n; i++) {
		for (int j = i + 1; j < n; j++) {
			ll res = input_line[i] * input_line[j];
			int pop_count = __builtin_popcountll(res);
			if (pop_count > max) {
				first = i;
				second = j;
				max = pop_count;
			}
		}
	}
	printf("%lld\n", max);
	printf("%lld %lld\n", input_line[first], input_line[second]);

	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