HDOJ 1042

N!

Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 44090    Accepted Submission(s): 12421

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

 

Author

JGShining（极光炫影）

 

裸地高精度，直接JAVA水过，一开始以为0！ = 1，还去特判了，真是脑残了

import java.io.*;import java.util.*;import java.math.*;/** * * @author XM_zhou */public class Main{    public static void main(String[] args)    {        Scanner cin = new Scanner(new BufferedInputStream(System.in));        int n;        BigInteger ans;        while (cin.hasNextInt())        {            n = cin.nextInt();            ans = BigInteger.ONE;            for (int i = 2; i <= n; i++)            {               ans = ans.multiply(BigInteger.valueOf(i));            }                        System.out.println(ans);        }    }}