Brainteaser
这类题目就是先观察规律，再下手写题。 一般来说能想明白关键点，题目就会迎刃而解， 并且代码很短。
Leetcode
| No. | title | difficulty |
|---|---|---|
| 292 | Nim Game | Easy |
| 777 | Swap Adjacent in LR String | Medium |
| 319 | Blub Switcher | Medium |
| 521 | Longest Uncommon Subsequence I | Easy |
| 1033 | Moving Stones Until Consecutive | Easy |
| 1227 | Airplane Seat Assignment Probability | Medium |
| 1503 | Last Moment Before All Ants Fall Out of a Plank | Medium |