#include <iostream>  
using namespace std;  
int t,x,y;
int main() 
{  
    cin>>t;  
    while (t--) 
    {  
        cin>>x>>y;   
        if (x<0||y<0) 
        {  
            cout<<"PING"<<endl;
        } 
        else 
        {  
            if ((x+y)%2==0) 
            {  
                cout<<"NO"<<endl;  
            }
            else
            {  
                cout<<"YES"<<endl;  
            }  
        }  
    }  
    return 0;  
}

代码见上