# 0449. Serialize and Deserialize BST

<https://leetcode.com/problems/serialize-and-deserialize-bst>

## Description

Serialization is converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection link to be reconstructed later in the same or another computer environment.

Design an algorithm to serialize and deserialize a **binary search tree**. There is no restriction on how your serialization/deserialization algorithm should work. You need to ensure that a binary search tree can be serialized to a string, and this string can be deserialized to the original tree structure.

**The encoded string should be as compact as possible.**

**Example 1:**

```
**Input:** root = [2,1,3]
**Output:** [2,1,3]
```

**Example 2:**

```
**Input:** root = []
**Output:** []
```

**Constraints:**

* The number of nodes in the tree is in the range `[0, 104]`.
* `0 <= Node.val <= 104`
* The input tree is **guaranteed** to be a binary search tree.

## ac

```java
```