[CareerCup] 2.5 Add Two Numbers 两个数字相加

2..5 You have two numbers represented by a linked list, where each node contains a single digit. The digits are stored in reverse order, such that the 1‘s digit is at the head of the list. Write a function that adds the two numbers and returns the sum as a linked list.
EXAMPLE
Input: (7-> 1 -> 6) + (5 -> 9 -> 2).That is, 617 + 295.
Output: 2 -> 1 -> 9.That is, 912.
FOLLOW UP
Suppose the digits are stored in forward order. Repeat the above problem.
EXAMPLE
Input: (6 -> 1 -> 7) + (2 -> 9 -> 5).That is, 617 + 295.
Output: 9 -> 1 -> 2.That is, 912.

LeetCode上的原题，请参见我之前的博客Add Two Numbers 两个数字相加。

[CareerCup] 2.5 Add Two Numbers 两个数字相加

原文：http://www.cnblogs.com/grandyang/p/4662599.html