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大牛帮忙```#include<stdio.h>
main()
{
int a[11],i;
a[0]=1;
for(i=1;i<11;i++)
a[i]=i*a[i-1];
int num,t;
scanf("%d",&num);
for(;num>=0;)
{
for(i=1,t=11;i<=t&&t!=1;)
{
if(num==0){num=2;break;}
if(num==a[i]){num=1;break;}
if(a[i]>num){num-=a[i-1];t=i-1;i=1;}
else i++;
}
if(num>1)printf("NO\n");
else printf("YES\n");
scanf("%d",&num);
}
}
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