Leetcode 141 & 142 環形鏈表Ⅰ、Ⅱ【鏈表】

Leetcode 141 1.思路 1）設置快慢指針，如果可以重合，則證明有環 2.代碼 # Definition for singly-linked list. # class ListNode(object): # def __init__(self, x): # self.val = x # self.next = None class Solution(object): def

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