hdu 2092 整数解

#include<iostream>
#include<math.h>
using namespace std;
int main()
{
	int n,m;
	double a;
	int b;
	while(scanf("%d%d",&n,&m)!=EOF)
	{
		if(n==0&&m==0)
		break;
		
		if(n==0&&m<=0)
		{
			a=sqrt(-m);
			b=sqrt(-m);
			if(a==b)
			{
				printf("Yes\n");
				continue;
			}
			
		}
		a=sqrt(n*n-4*m);
		b=sqrt(n*n-4*m);
		if(a==b)
		{
			if((n+b)%2==0||(n-b)%2==0)
			{
				printf("Yes\n");
				continue;
			}
		}
		printf("No\n");
	}
	return 0;
}