从零开始，每天三道题
刷题顺序：数组， 字符串， 链表， 数学， 栈， 哈希， 图， 树(easy->moderate->difficult) 进阶：排序， 动态规划(最重要)， 贪心， 递归， 二分， 双指针， 深度优先， 广度优先， sliding window， 回溯(做哪些题看github收藏Leetcode)
时间复杂度：T(n),T为当输入为n时，某段代码的执行次数，n为输入数据的大小或者数量，由于T(n)计算复杂我们使用时间复杂度来代替T(n)
T(n) = 2 ,T(n)为常数时时间复杂度可以直接估算为1即O(1)
T(n) = 2n + 2, 2在2n前相当于不存在，而2n中常数2可估算为1，即T(n)的时间复杂度为O(n)
T(n) = 5(n3) + 6666*(n2) + 233, T(n)为多项式时直接保留最高项即为时间复杂度且将最高项的常数估算为1，即T(n)的时间复杂度为O(n**3)
空间复杂度：
单调队列？？？？ (1) 二分查找法时间复杂度：O(logn) (2) python中sort()排序时间复杂度为O(nlogn)，空间复杂度为O(n)
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
Django
The Web framework for perfectionists with deadlines.
Laravel
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
Microsoft
Open source projects and samples from Microsoft.
Google
Google ❤️ Open Source for everyone.
Alibaba
Alibaba Open Source for everyone
D3
Data-Driven Documents codes.
Tencent
China tencent open source team.
