Lang:G++
Edit1234567891011121314151617#include<bits/stdc++.h>using namespace std;#define ll long longll ans;int n,i,j,k,s[30];int main(){scanf("%d",&n);for(i=0;i<n;i++){scanf("%d",&j);for(k=0;k<30;k++)s[k]+=j>>k&1;}for(i=0;i<30;i++)ans+=(ll)s[i]*(n-s[i]);cout<<ans<<endl;return 0;}