codeforces 1260 B. Obtain Two Zeroes

分析：

#include<cstdio>
#include<cstring>
#include<string>
#include<cmath>
#include<algorithm>
#include<iostream>
#define ll long long 
using namespace std;

ll a,b;

int main()
{
	int t;
	scanf("%d",&t);
	while(t--)
	{
		ll aa,bb;
		cin>>aa>>bb;
		a=max(aa,bb);
		b=min(aa,bb);
		int ok;
		if(a<=2*b)
		{
			if((a+b)%3==0)
				ok=1;
			else
				ok=0;
		}
		else
			ok=0;
		if(ok==0)
			cout<<"NO\n";
		else
			cout<<"YES\n";
	}
	return 0;
}