这个时候我们就想起了一个基于链表的数据结构——双向链表(Doublelinked list)。 所以我们现在要做的事是把Doublelinked list和Hashmap结合起来组成一个新的数据结构。 代码如下: class LRUCache { HashMap<Integer,Node> map = new HashMap<>(); DoubleLinkedlist cache = new DoubleLinkedlist(); int capacity;...
leetcode 经典题146 LRU cache Doublelinked list+Hashmap解法,做过这题的都知道可以用LinkedHashMap解法,但是这篇文章是通过双向链表和哈希图结合来实现的,虽然复杂了点。但是能更好的帮助我们理解这个题的逻辑。题目我就不再在这里复述了,直接开讲。这道题要求时间复
Given a linked list, return the node where the cycle begins. If there is no cycle, returnnull. Follow up: Can you solve it without using extra space? 题意: 给定一个链表,找到环起始的位置。如果环不存在,返回NULL。 分析: (1)首先要判断该链表是否有环。如果没有环,那么返回NULL。 (2)其次,...
2019-12-11 09:45 −原题链接在这里:https://leetcode.com/problems/linked-list-random-node/ 题目: Given a singly linked list, return a random node's value from the linked list. Each... Dylan_Java_NYC 0 276 Flatten Binary Tree to Linked List ...
[88. 合并两个有序数组](https://leetcode-cn.com/problems/merge-sorted-array/) [125. 验证回文串](https://leetcode-cn.com/problems/valid-palindrome/) [141. 环形链表](https://leetcode-cn.com/problems/linked-list-cycle/) [142. 环形链表 II](https://leetcode-cn.com/problems/linked-lis...
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## 题目地址(142. 环形链表 II - 力扣(LeetCode)) https://leetcode.cn/problems/linked-list-cycle-ii/description/ ## 题目描述 <p> 给定一个链表的头节点 <code> head </code> ,返回链表开始入环的第一个节点。 <em> 如果链表无环,则返回 <code> null </code>。<...
【leetcode】1290. Convert Binary Number in a Linked List to Integer 2019-12-23 09:54 −题目如下: Given head which is a reference node to a singly-linked list. The value of each node in the linked list is either 0 or 1. The lin... ...
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