HDU 1042 N!

N!
Problem DescriptionGiven an integer N(0 ≤ N ≤ 10000), your task is to calculate N!
 
InputOne N in one line, process to the end of file.
 
OutputFor each N, output N! in one line.
 
Sample Input

123

 
Sample Output

126

 
AuthorJGShining（极光炫影）

解题思路：这题用Java大数，而且不能预处理，预处理会超内存

import java.util.*;import java.math.*;public class Main {    public static void main(String[] args) {        Scanner scan=new Scanner(System.in);        while(scan.hasNextInt()){            int n=scan.nextInt();            BigInteger ans=new BigInteger("1");            for(int i=2;i<=n;i++){                BigInteger tmp=new BigInteger(i+"");                ans=ans.multiply(tmp);            }            System.out.println(ans);        }        scan.close();    }}