297 https://leetcode.com/problems/serialize-and-deserialize-binary-tree/449 https://leetcode.com/problems/serialize-and-deserialize-bst/ 똑같은 문제라서 같이 올림. 문자열로 인코딩하고 디코딩해주는 문제이다. from collections import deque class Codec: def serialize(self, root): if not root: return '' ret = deque() queue = deque([root]) while queue: p = queue.popleft() if not p: ret.append('null') continue ret.append(p.val) for..