【编程】【2017京东java实习生编程题】异或

题目：

http://exercise.acmcoder.com/online/online_judge_ques?ques_id=4397&konwledgeId=41

package com.smart.reflect;

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner=new Scanner(System.in);
        int n=scanner.nextInt();
        String s1=scanner.next();
        String s2=scanner.next();
        char[] s1arr=s1.toCharArray();
        char[] s2arr=s2.toCharArray();
        int sum=0;
        for (int i = 0; i