杭电 HDU 2674 N！Again

N！Again

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 3871    Accepted Submission(s): 2070

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

24120

 

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;}elsecout<<0<<endl;}return 0;}