设计一个计算某年某月总天数的算法，如图，哪里有误？请大佬解答

#include <stdio.h>
int main()
{
int n,y,r,arr[]={0,31,59,90,120,151,181,212,243,273,304,334};
scanf("%d%d%d",&n,&y,&r),
printf("%d\n",!((n%4||!(n%100))&&n%400)||y<3+r+arr[y-1]);
return 0;
}