摘要：
Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space? 题意： 给定一个链表，判断是否循环 思路： 快慢指针 若有环，则快慢指针一定会在 阅读全文
摘要：
Given a linked list and a value x, partition it such that all nodes less than x come before nodes greater than or equal to x. You should preserve the 阅读全文
摘要：
Given a sorted linked list, delete all duplicates such that each element appear only once. Example 1: Example 2: 题意： 有序链表去重 思路： 代码： 阅读全文
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Given a binary tree where all the right nodes are either leaf nodes with a sibling (a left node that shares the same parent node) or empty, flip it up 阅读全文
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Reverse a singly linked list. Follow up: A linked list can be reversed either iteratively or recursively. Could you implement both? 题意： 如题 思路： 无 代码： 阅读全文