Homework Introduction
最后三题是卡特兰数，非常简单。
Problem
Please claim the assignment to see the problems.
- Status
- Live...
- Problem
- 12
- Open Since
- 2025-12-13 11:30
- Deadline
- 2026-1-24 23:59
- Extension
- 24 hour(s)
最后三题是卡特兰数，非常简单。