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;
}