数学--数论--HDU 2674 沙雕题

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

import java.util.Scanner;

public class Main {
	static int ppp[]=new int [3000];
	static void init() {
		ppp[0]=ppp[1]=1;
		for(int i=1;i<=2009;i++) 
			ppp[i]=(ppp[i-1]*i)%2009;
	}
	public static void main(String[] args) {
  
		    init();
		    int l;
		    Scanner in = new Scanner(System.in);
		    while(in.hasNext()){
		    	l=in.nextInt();
		        if(l>=2009)
		            System.out.println(0);
		        else
		        	System.out.println( ppp[l]);
		    }
		}
}

来源：CSDN

作者：张俊浩

链接：https://blog.csdn.net/weixin_43627118/article/details/103639483