PAIRWISE AND

// s=summation(a[i]&a[j]) for all (i,j) i<j

#include<iostream>
int main()
{
    int n;
    std::cout<<"Enter n: ";
    std::cin>>n;
    int *a=new int[n];
    std::cout<<"Enter the integers: \n";
    for(int i=0;i<n;++i)
        std::cin>>a[i];
    int s=0;
    for(int i=0;i<n-1;++i)
        for(int j=i+1;j<n;++j)
            s+=a[i]&a[j];
    std::cout<<"Output= "<<s;
    delete[] a;
}