Topics

1. Graph
2. Linked List
3. Dynamic Programming
4. Sorting And Searching
5. Tree / Binary Search Tree
6. Number Theory
7. BIT Manipulation
8. String / Array

Refs:
top-10-algorithms-in-interview-questions

LeetCode

Tree 前中后顺序遍历，递归/非递归 从排序数组构建二叉树 从排序列表构建二叉树 Binary Search Tree Iterator
中序遍历非递归拆开写