(introductory) Coin Piles

#include <iostream>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    int t;
    cin >> t;
    while(t--){
        int x, y;
        cin >> x >> y;
        // Keep making moves until both piles are empty or no more moves can be made
        while (x > 0 && y > 0) {
            if (x > y) {
                int diff=x-y;
                x -= 2*(diff);
                y -= 1*(diff);
            }
            else if (y > x) {
                int diff=y-x;
                x -= 1*(diff);
                y -= 2*(diff);
            }
            else {
                if(x%3==0){
                    x=0;
                    y=0;
                }else{
                    break;
                }
            }
        }
        if (x == 0 && y == 0) {
            cout << "YES" << endl;
        } else {
            cout << "NO" << endl;
        }
    }
    return 0;
}