刷题 Add Two Numbers

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2. Add Two Numbers

Medium

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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.

class Solution(object):

	def addTwoNumbers(self, l1, l2):
		    """
		    :type l1: ListNode
		    :type l2: ListNode
		    :rtype: ListNode
		    """

		    carry = 0
		    s = 0
		    #l1 = l1.next
		    #l2 = l2.next
		    res =ListNode(0)
		    r = res
		    while True:
		        if (l1 is None) and (l2 is None):
		          break  
		        if l1 is None:
		          a = 0
		        else:
		          a = l1.val
		          l1 = l1.next
		        if l2 is None:
		          b = 0	
		        else:
		          b = l2.val
		          l2 = l2.next
		        #print 'dd'
		        s = a+b+carry
		        #print s,'= ',a,'+',b,'+',carry
		        res.next = ListNode(s%10)
		        res = res.next
		        carry = s/10
		        #print 'c',carry
		    #print 'c',carry
		    if carry>0:
		      res.next = ListNode(carry)
		    return r.next