ARTS挑战，第二周

1、Algorithm

Add Two Numbers

You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order 
and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.

You may assume the two numbers do not contain any leading zero, except the number 0 itself.

Example:

Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
Output: 7 -> 0 -> 8
Explanation: 342 + 465 = 807.

要求：给到两个非空链表，它们表示两个非负整数。数字以相反的顺序存储它们的每个节点都包含一位数字。将这两个数字相加并以链表的形式返回。

编写代码： 

class Solution {
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        ListNode firstNode = new ListNode(-1);
        ListNode resultNode = firstNode;
        int nextAddValue = 0, addValue = 0;
        if (l1 != null || l2 != null) {
            addValue = l1.val + l2.val;
            nextAddValue = addValue / 10;
            resultNode = new ListNode(addValue % 10);
            l1 = l1.next;
            l2 = l2.next;
            firstNode = resultNode;

            while (l1 != null || l2 != null || nextAddValue != 0) {
                addValue = nextAddValue;
                if (l1 != null){
                    addValue += l1.val;
                }
                if (l2 != null){
                    addValue += l2.val;
                }

                nextAddValue = addValue / 10;
                ListNode resNode = new ListNode(addValue % 10);
                resultNode.next = resNode;
                resultNode = resNode;

                if (l1 != null){
                    l1 = l1.next;
                }
                if (l2 != null){
                    l2 = l2.next;
                }
            }
        }
        return firstNode;
    }
}

思路：循环，存在的情况，两个链表长度不一样，和的长度不一样。

2、Review

阅读文章：https://medium.com/@bethanymarz/the-worst-questions-you-can-ask-your-future-employer-in-a-job-interview-a46ae24b65e3

点评：文章列举了关于在面试的最后一个环节“问面试官问题”的5个最糟糕的问题，以及为什么作者会这么认为这些问题很糟糕。在阅读这篇文章的过程中，最大的感受是国外表述、说话的思路，理解起来感觉很吃力。比如：

But as for the worst questions? Oh yeah, that part is easy.

And so, I give you my five least favorite questions to be asked in an interview, along with why I think they suck, and what you might ask instead.