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[leetcode]Add Two Numbers @ Python

原题地址:https://oj.leetcode.com/problems/add-two-numbers/

题意:

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

解题思路:链表的操作。

代码:

# Definition for singly-linked list.# class ListNode:#     def __init__(self, x):#         self.val = x#         self.next = Noneclass Solution:    # @return a ListNode    def addTwoNumbers(self, l1, l2):        if l1 == None: return l2        if l2 == None: return l1        flag = 0        dummy = ListNode(0); p = dummy        while l1 and l2:            p.next = ListNode((l1.val+l2.val+flag) % 10)            flag = (l1.val+l2.val+flag) / 10            l1 = l1.next; l2 = l2.next; p = p.next        if l2:            while l2:                p.next = ListNode((l2.val+flag) % 10)                flag = (l2.val+flag) / 10                l2 = l2.next; p = p.next        if l1:            while l1:                p.next = ListNode((l1.val+flag) % 10)                flag = (l1.val+flag) / 10                l1 = l1.next; p = p.next        if flag == 1: p.next = ListNode(1)        return dummy.next