zoj 2358 Sum of Factorials

#include<stdio.h>#include<string.h>#include<algorithm>using namespace std;int main(){    int n,i;    int fact[11];    fact[0]=1;    for(i=1;i<=10;i++)        fact[i]=fact[i-1]*i;    while(scanf("%d",&n)!=EOF)    {        if(n<0) break;        if(n==0) printf("NOn");        else {     for(i=10;i>=0;i--)      {         if(n-fact[i]>=0)  n-=fact[i];     } if(n==0)     printf("YESn"); else     printf("NOn");        }    }    return 0;}