[UVa] 10220 - I Love Big Numbers !

題目網址: http://goo.gl/LnmTtS

題意:
(from luckycat)


解 法: 大數運算。

TAG: BigNum,

注意:

程式碼:

	/**
	* Tittle: 10220 - I Love Big Numbers !
	* Author: Cheng-Shih, Wong
	* Date: 2015/05/21
	*/
	import java.util.*;
	import java.math.*;
	public class Main {
	public static void main( String[] args ) {
	int n, ans;
	Scanner input = new Scanner( System.in );
	BigInteger[] fact = new BigInteger[1005];
	String str = null;
	// initialization
	fact[0] = BigInteger.ONE;
	for( int i=1; i<=1000; ++i )
	fact[i] = fact[i-1].multiply( BigInteger.valueOf(i) );
	// input
	while( input.hasNext() ) {
	n = input.nextInt();
	// solve
	str = fact[n].toString();
	ans = 0;
	for( int i=0; i<str.length(); ++i )
	ans += str.charAt(i)-'0';
	// output
	System.out.println(ans);
	}
	input.close();
	}
	}

view raw Main.java hosted with ❤ by GitHub