xnJ45p - Online C++0x Compiler & Debugging Tool

#include <bits/stdc++.h>

using namespace std;
#define int long long
#define yes cout << "YES\n";
#define no cout << "NO\n";


void FastIO(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
}

void solve(){
    int n,x;
    cin >> x >> n;

    if(n%2 == 0){
        cout << 0 << '\n';
    }
    else{
        cout << x << "\n";
    }
}

signed main(){
    FastIO();

    int t;
    cin >> t;

    while(t--){
        solve();
    }
    return 0;
}