HDU 1042 N! -- 求阶乘 java大法好

N!

Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 262144/262144 K (Java/Others)
Total Submission(s): 72968    Accepted Submission(s): 21130

Problem Description

Given an integer N(0 ≤ N ≤ 10000), your task is to calculate N!

 

Input

One N in one line, process to the end of file.

 

Output

For each N, output N! in one line.

 

Sample Input

123

 

Sample Output

126

 

import java.math.BigInteger;import java.util.Scanner;public class Main {    public static void main(String[] args) {        Scanner cin = new Scanner(System.in);        BigInteger [] a = new BigInteger[10005];        a[0] = BigInteger.ONE;        for(int i=1;i<=10000;i++){            a[i] = BigInteger.valueOf(i).multiply(a[i-1]);        }        while(cin.hasNext()){            int n = cin.nextInt();            System.out.println(a[n]);        }    }}