- Ask questions
- Code clean
- easy to read
- easy for extension
- Bug free
- 150 - 200 is good enough
- Only submit 3 times
- Classify the problems
- Binary Search
- Binary Tree & Divide Conquer
- Dynamic Programming I
- Dynamic Programming II
- Linked List
- Array & Numbers
- Data Structure
- Graph & Search
- Write TEMPLATE
- What is None in Python?