1790E - Vlad and a Pair of Numbers - CodeForces Solution

#include <bits/stdc++.h>
using namespace std;
#define ll long long

int main()
{
    ll t;
    cin>>t;

    while(t--){
        ll n;
        cin>>n;

        bool bl =true;
        if(n&1) bl=false;
        ll a = n/2;
        if(a&n || !bl) cout<<-1<<endl;
        else cout<< (a|n)<<" "<< a<<endl;
    }
    return 0;
}