POJ 2389 Bull Math JAVA .

題目位址：http://poj.org/problem?id=2389

用 JAVA 顯得太水一點了.. 

import java.util.*;
import java.math.*;
import java.text.*;
import java.io.*;

public class Main
{

	public static void main(String[] args) {
		Scanner cin = new Scanner(new BufferedInputStream(System.in));

		BigInteger a=cin.nextBigInteger(),b=cin.nextBigInteger();
		System.out.println(a.multiply(b));
	}
}