N！Again

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)

Problem Description

WhereIsHeroFrom:             Zty, what are you doing ?

Zty:                                     I want to calculate N!......

WhereIsHeroFrom:             So easy! How big N is ?

Zty:                                    1 <=N <=1000000000000000000000000000000000000000000000…

WhereIsHeroFrom:             Oh! You must be crazy! Are you Fa Shao?

Zty:                                     No. I haven‘s finished my saying. I just said I want to calculate N! mod 2009

Hint : 0! = 1, N! = N*(N-1)!

Input

Each line will contain one integer N(0 <= N<=10^9). Process to end of file.

Output

For each case, output N! mod 2009

Sample Input

4
5

Sample Output

24
120

Author

WhereIsHeroFrom

Source

HDU女生专场公开赛——谁说女子不如男

此题有技巧 否则会超时

#include<iostream>
using namespace std;
int main()

{
	int N;
	while(cin>>N)
	{
		int sum=1;int result=0;
		if(N<2009)
		{
			for(int i=1;i<=N;i++)
			{
				sum*=i;
			   sum%=2009;
			}
		    cout<<sum<<endl;
		}
		else
			cout<<0<<endl;

	}
	return 0;
}