【枚举】bzoj1643 [Usaco2007 Oct]Bessie's Secret Pasture 贝茜的秘密草坪

#include<cstdio>
#include<cmath>
using namespace std;
int n,ans;
int sqr(int x){return x*x;}
int main()
{
	scanf("%d",&n);
	for(int i=0;i*i<=n;++i)
	  for(int j=0;j*j+i*i<=n;++j)
	    for(int k=0;k*k+i*i+j*j<=n;++k)
	      {
	      	int t=n-i*i-j*j-k*k;
	      	if(sqr((int)sqrt((double)t))==t)
	      	  ++ans;
	      }
	printf("%d\n",ans);
	return 0;
}