993_Cousins in Binary Tree
https://leetcode.com/problems/cousins-in-binary-tree/
https://leetcode.com/problems/cousins-in-binary-tree/
```python test = [0, 0, 0, 1, 2, 3, 4, 5, 6] test1 = [0, 0, 0, 1, 2, 3, 4, 5, 6]
https://leetcode.com/problems/keys-and-rooms/
원격 접속시, 비밀번호 말고 key를 제출하는 방식으로 사용하고 싶을때.
테스트용 두번째 포스팅!