本博客不定期更新 LeetCode 题目总结，所有题目使用 Java 实现，前 400 题的部分题目也提供 JavaScript 代码。但是我想现如今你完全可以用任何 AI 工具把 Java 代码翻译成 JavaScript 或任何其他语言以达到学习的目的。我不追求一行 AC 但是我追求一题多解，比较常规的思路，解释清楚复杂度，代码可读性强。欢迎留言和评论，共同进步。这本是我自己用来复习的笔记，如

二分法是算法题里面一个比较基础但是很容易错的概念，一开始练习的时候由于不熟悉二分法的套路，反复出现死循环或者目标值找错，非常影响做题心情。我总结了如下几个模板。原则上这里的模板无论你使用哪一个，都可以解决二分法类型的问题，只不过有一些题目，比如寻找一个最大值/最小值的，可能某一个模板更适合，需要判断的条件较少。 如下模板是用Java实现的 模板一，找有序数组中是否存在一个目标值。注意 r

自己曾经做了一个网站部署在一台 ubuntu 服务器上，但是由于一开始不会配置 SSL，所以花钱买了付费的 SSL。最近发现了 Let’s Encrypt，可以免费申请 SSL 证书，下面是详细的教程。 我的网站是一个 React 的项目，所以我的服务器上只是一个简单的 Node.js 环境 + Nginx。我主要参考了这个帖子。如果你是用其他的环境比如LAMP那一套的，请自行搜索其他的教程。 0

You are given a string s and a robot that currently holds an empty string t. Apply one of the following operations until s and t are both empty: Remove the first character of a string s and give it to

You are given a string word, and an integer numFriends. Alice is organizing a game for her numFriends friends. There are multiple rounds in the game, where in each round: word is split into numFriends

You are given a 0-indexed integer array nums of size 3 which can form the sides of a triangle. A triangle is called equilateral if it has all sides of equal length.A triangle is called isosceles if it

You are given a 0-indexed integer array nums. Return the maximum value over all triplets of indices (i, j, k) such that i < j < k. If all such triplets have a negative value, return 0. The value

An element x of an integer array arr of length m is dominant if more than half the elements of arr have a value of x. You are given a 0-indexed integer array nums of length n with one dominant element

You are given a 2D integer grid of size m x n and an integer x. In one operation, you can add x to or subtract x from any element in the grid. A uni-value grid is a grid where all the elements of it a

You are given a 0-indexed binary string s of length n on which you can apply two types of operations: Choose an index i and invert all characters from index 0 to index i (both inclusive), with a cost