Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set. get(key) - Get the value (will always be positive) of the key if the key exists in the cache, otherwise return -1. set…

LRU算法是首先淘汰最长时间未被使用的页面,而LFU是先淘汰一定时间内被访问次数最少的页面,如果存在使用频度相同的多个项目,则移除最近最少使用(Least Recently Used)的项目. LFU在频度相同的时候与LRU类似. 146. LRU Cache 1.stl中list是双向链表,slist才是单向链表. rbegin():返回尾元素的逆向迭代器指针 end():返回尾元素之后位置的迭代器指针 https://www.cnblogs.com/Kobe10/p/5780095.html…

esign and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set. get(key) - Get the value (will always be positive) of the key if the key exists in the cache, otherwise return -1.set(k…

Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and put. get(key) - Get the value (will always be positive) of the key if the key exists in the cache, otherwise return -1.put(…

Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set. get(key) - Get the value (will always be positive) of the key if the key exists in the cache, otherwise return -1.set(…

146. LRU缓存机制 运用你所掌握的数据结构,设计和实现一个 LRU (最近最少使用) 缓存机制.它应该支持以下操作: 获取数据 get 和 写入数据 put . 获取数据 get(key) - 如果密钥 (key) 存在于缓存中,则获取密钥的值(总是正数),否则返回 -1. 写入数据 put(key, value) - 如果密钥不存在,则写入其数据值.当缓存容量达到上限时,它应该在写入新数据之前删除最近最少使用的数据值,从而为新的数据值留出空间. 进阶: 你是否可以在 O(1) 时间复杂度…

https://leetcode.com/problems/lru-cache/ Design and implement a data structure for Least Recently Used (LRU) cache. It should support the following operations: get and set. get(key) - Get the value (will always be positive) of the key if the key exis…

原题地址 以前Leetcode的测试数据比较弱,单纯用链表做也能过,现在就不行了,大数据会超时.通常大家都是用map+双向链表做的. 我曾经尝试用C++的list容器来写,后来发现map没法保存list的iterator,总是报错,我也不知道为什么.后来只好手写双向链表,真是痛苦啊,一不小心就会出错.怪不得这道题是hard 代码: struct Node { int key; int val; Node *prev; Node *next; Node() : prev(NULL), next(N…

There are a total of n courses you have to take, labeled from 0 to n - 1. Some courses may have prerequisites, for example to take course 0 you have to first take course 1, which is expressed as a pair: [0,1] Given the total number of courses and a l…

Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.) You have the following 3 operations permitted on a word: a) Insert a character b) Delete a character c) Repla…