- Leetcode book (PDF), 50 problems: [GDrive](https://drive.google.com/open?id=1orcP-UEyBNMoiJeQypGVgDNLn8JbVfcJ) - https://leetcode.com/explore/featured/card/top-interview-questions-easy/ - https://leetcode-cn.com/explore/interview/card/top-interview-quesitons-in-2018 - 腾讯精选50题 https://leetcode-cn.com/problemset/50/
