'''

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

'''

class ListNode(object):

def __init__(self, x):

self.val = x

self.next = None

class Solution(object):

def addTwoNumbers(self, l1, l2):

pNode = ListNode(0)

pHead = pNode

val = 0

while l1 or l2 or val:

if l1:

val += l1.val

l1 = l1.next

if l2:

val += l2.val

l2 = l2.next

pNode.next = ListNode(val % 10)

val /= 10

pNode = pNode.next

return pHead.next