hdu 1851 A Simple Game

#include<iostream>
#include<stdio.h>
using namespace std;
int main(){
int t,sum,n,m,i,x;
scanf("%d",&t);
while(t--){
scanf("%d",&x);
sum=0;
for(i=0;i<x;i++){
scanf("%d %d",&n,&m);
sum^=(n%(m+1));
}
if(sum==0)
printf("Yes\n");
else
printf("No\n");
}
return 0;
}