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为什么Output Limit Exceeded？

Posted by power721 at 2009-09-27 09:36:14 on Problem 1775 
#include<stdio.h>
int a[]={1,1,2,6,24,120,720,5040,40320,362880};
main()
{
int n,i;
while(scanf("%d",&n)&&n!=-1)
{i=10;
if(!n)
	{puts("NO");continue;}
while(i--&&n)
	if(n>=a[i])
		n-=a[i];
if(n)
	puts("NO");
else
	puts("YES");
}		
}
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