HDU 2674 N！Again

N！Again

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 3481    Accepted Submission(s): 1889

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

 

题目来源：http://acm.hdu.edu.cn/showproblem.php?pid=2674

#include <stdio.h>
#include <stdlib.h>
int main() 
{
    int n;
    int ans,i;
    while(~scanf("%d",&n))
    {
        ans=1;
        if(n>=2009)
            printf("0
");
        else
        {
            for(i=1;i<=n;i++)    
            {
                ans*=i;
                ans%=2009;
            }
            printf("%d
",ans);    
        }
    }
    return 0;
}