- 8 名前：デフォルトの名無しさん mailto:sage [2008/06/08(日) 20:31:17 ]
- >>5
#include<stdio.h>
#include<math.h>
#define EPS (1e-10)
long internal_point(double r){
int x, y;
long count=0;
for(x=0;x<=r;x++){
y=sqrt(r*r-x*x+EPS);
if(x==0) count+=2*y+1;
else count+=(2*y+1)*2;
}
return count;
}
int main(void){
int R=2;
printf("%ld\n", internal_point(R+1)-internal_point(R));
return 0;
}
