【LeetCode with Python】 Linked List Cycle
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原题页面：https://oj.leetcode.com/problems/linked-list-cycle/
题目类型：
难度评价：★
本文地址：http://blog.csdn.net/nerv3x3/article/details/3465710
原题页面：https://oj.leetcode.com/problems/linked-list-cycle/
题目类型：
难度评价：★
本文地址：http://blog.csdn.net/nerv3x3/article/details/3465710
Given a linked list, determine if it has a cycle in it.
Follow up:
Can you solve it without using extra space?
确定链表是否有环。记得好像是编程之美上的题目？
class Solution: # @param head, a ListNode # @return a boolean def hasCycle(self, head): if None == head: return False fast = slow = head while True: fast = fast.next if None == fast: return False fast = fast.next if None == fast: return False slow = slow.next if fast == slow: return True
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