http://www.lydsy.com/JudgeOnline/problem.php?id=1041

科普一下高斯素数以及复平面那一套理论https://www.bilibili.com/video/av3372382/#page=52

以及勾股数可视化 https://www.bilibili.com/video/av12133637/

#include
     
      #include
      
       typedef long long ll;ll x;int ans,cnt;int main(){    scanf("%lld",&x);    ans=1;    for(register int i=2;1ll*i*i<=x;++i){    	cnt=0;    	while(x%i==0){			x/=i;			if(i%4==1)				++cnt;		}		ans*=(cnt*2+1);	}	if(x%4==1&&x!=1)		ans*=3;	printf("%d\n",ans*4);    return 0;}