Counting ones

#include <iostream>
#include <vector>
#include <climits>
#include <cstdint>

using namespace std;
#define DEBUG std::cout<<"LINE"<<__LINE__;
#define IN(A) int A;std::cin>>A;

template<typename T> void printV(vector<T> V) {
    for (int i=0;i<V.size()-1;i++) {
        cout<<V[i]<<" ";
    }

    cout<<V[V.size()-1];
    cout<<endl;
}
int64_t max3(int64_t a,int64_t b,int64_t c) {
    return max(a,max(b,c));
}
struct compute {
    int tests=1;
    vector<uint64_t> data;
    bool start() {
        IN(n);

        data.assign(n,{});
        readV(n);
        int maxv=0;
        int maxi=0;
        int maxj=0;
        for (int i=0;i<n-1;i++) {
            for (int j=i+1;j<n;j++) {
               uint64_t temp=data[i]*data[j];
               auto bits= std::popcount(temp);
                if (maxv<bits) {
                    maxv=bits;
                    maxi=i;
                    maxj=j;
                }
            }
        }
        std::cout<<maxv<<"\n";
        std::cout<<data[maxi]<<" "<<data[maxj]<<endl;

        return true;
    }
    void readV(int n) {
        for (int i=0;i<n;i++) cin>>data[i];

    }
    void testloop(){
        while (tests-->0) {
            start();
        }
    }
};

int main() {
    compute comp;
    comp.start();


}

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