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O(9)的贪心还要32ms,这是为什么?#include<stdio.h>
int fac[10]={1,1,2,6,24,120,720,5040,40320,362880};
int main()
{
int n,i,sign;
while(scanf("%d",&n),n>=0)
{
sign=0;
for(i=9;i>=0;i--)
{
if(n>=fac[i])
{
n-=fac[i];
sign=1;
}
}
if(sign && !n) printf("YES\n");
else printf("NO\n");
}
return 0;
}
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