pirateTurtle

- [x] https://github.com/DaleStudy/leetcode-study/issues/218 - [x] https://github.com/DaleStudy/leetcode-study/issues/233 - [ ] https://github.com/DaleStudy/leetcode-study/issues/238 - [x] https://github.com/DaleStudy/leetcode-study/issues/253 - preorder 순회 `O(N)` 에다가 findIndex 순회 `O(N)` 이 중첩되어 있으니 `O(N^2)`로 생각했는데 leetcode analyze 에서는 시간복잡도를...

## 답안 제출 문제 - [x] https://github.com/DaleStudy/leetcode-study/issues/226 - [ ] https://github.com/DaleStudy/leetcode-study/issues/246 - [ ] https://github.com/DaleStudy/leetcode-study/issues/261 - [ ] https://github.com/DaleStudy/leetcode-study/issues/276 - [ ] https://github.com/DaleStudy/leetcode-study/issues/286 ## 체크 리스트 - [x] PR을 프로젝트에...