Poj3673超水题

package easy;

import java.io.BufferedInputStream;
import java.util.Scanner;

/**
 * @author NC
 * Poj3673
 */
public class Poj3673 {

    public static void main(String[] args) {

        Scanner scan = new Scanner(new BufferedInputStream(System.in));
        Integer a = scan.nextInt();
        Integer b = scan.nextInt();
        char[] aa = a.toString().toCharArray();
        char[] bb = b.toString().toCharArray();
        int sum = 0;
        for (int i = 0; i < aa.length; i++) {
            for (int j = 0; j < bb.length; j++) {
                sum += (aa[i] - '0') * (bb[j] - '0');
            }
        }
        System.out.println(sum);
    }
}