Ghicitoare

#include <fstream>
using namespace std;

int main()
{
    int T,n,S,S1;
    ifstream fin("ghicitoare.in");
    fin>>T;
    ofstream fout("ghicitoare.out");
    for(int t=1;t<=T;++t)
    {
        fin>>n>>S;
        S1=0;
        for(int i=n/4*4;i<=n;++i)
            S1^=i;
        fout<<(S^S1)<<'\n';
    }
    return 0;
}