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/*

Author: King, wangjingui@outlook.com

Date: Dec 13, 2014

Problem: Add Two Numbers

Difficulty: easy

Source: https://oj.leetcode.com/problems/add-two-numbers/

Notes:

You are given two linked lists representing two non-negative numbers.

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.

Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)

Output: 7 -> 0 -> 8

Solution: dummy head...

*/

/**

* Definition for singly-linked list.

* public class ListNode {

* int val;

* ListNode next;

* ListNode(int x) {

* val = x;

* next = null;

* }

* }

*/

public class Solution {

public ListNode addTwoNumbers(ListNode l1, ListNode l2) {

ListNode dummy = new ListNode(0);

ListNode cur = dummy;

int carry = 0;

while (l1 != null || l2 != null || carry != 0) {

int sum = carry;

if (l1 != null) {

sum += l1.val;

l1 = l1.next;

}

if (l2 != null) {

sum += l2.val;

l2 = l2.next;

}

carry = sum/10;

sum = sum%10;

ListNode node = new ListNode(sum);

cur.next = node;

cur = cur.next;

}

return dummy.next;

}

}