hdu 2674(余数性质)_weixin_30416871的博客-程序员秘密

N！Again

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 4728    Accepted Submission(s): 2490

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

 

大于2009的直接输出0，小于的先打表。

#include <stdio.h>
#include <string.h>
#include <algorithm>
using namespace std;
typedef long long LL;
const int N = 2009;
short res[N];

void init(){
    res[0] = 1;
    res[1] = 1;
    for(int i=2;i<=N;i++){
        res[i] = (res[i-1]*i)%2009;
    }
}
int main()
{
    int n;
    init();
    while(~scanf("%d",&n)){
        if(n<=2009)
        printf("%d\n",res[n]);
        else printf("0\n");
    }
    return 0;
}