很有用的参考： 刷题
周赛
- 灵哥
- 题目难度等级
- 800 - 1100: easy
- 1200 - 1500: medium
- 1600 - 2000: hard
- Totally optional - 周赛题目评级
- 残酷群
- 心得
面试
OA
Topic
- Array
- Linked List
- Two Pointer
- Stack and Queue
- Monotonic Stack
- Backtracking
- Tree
- DP
- Sliding window
- Binary Search
- Graph
- Math and Geometry
- Priority Queue
- Sort
- prefix
- Trie
- Bit manipulation