1. Rookie tutorial

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LeetCode is a website that brushes algorithm questions. There are many languages to choose from. Problems can be divided into three levels: simple, medium and difficult. You can choose according to your level. If you want to enter a big factory, this may be an essential level.

7.chekeo

www.liaoxuefeng.com

Checkio is a browser-based game. You need to use Python or JavaScript to solve the problem before you can continue the game (login is required).