Create README - LeetHub

Author: hajin-kim

0297-serialize-and-deserialize-binary-tree/README.md

@@ -0,0 +1,28 @@
+<h2><a href="https://leetcode.com/problems/serialize-and-deserialize-binary-tree/">297. Serialize and Deserialize Binary Treea>h2><h3>Hardh3><hr><p>Serialization is the process of 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.p>
+
+<p>Design an algorithm to serialize and deserialize a binary tree. There is no restriction on how your serialization/deserialization algorithm should work. You just need to ensure that a binary tree can be serialized to a string and this string can be deserialized to the original tree structure.p>
+
+<p><strong>Clarification:strong> The input/output format is the same as <a href="https://support.leetcode.com/hc/en-us/articles/32442719377939-How-to-create-test-cases-on-LeetCode#h_01J5EGREAW3NAEJ14XC07GRW1A" target="_blank">how LeetCode serializes a binary treea>. You do not necessarily need to follow this format, so please be creative and come up with different approaches yourself.p>
+
+<p>&nbsp;p>
+<p><strong class="example">Example 1:strong>p>
+<img alt="" src="https://assets.leetcode.com/uploads/2020/09/15/serdeser.jpg" style="width: 442px; height: 324px;" />
+<pre>
+<strong>Input:strong> root = [1,2,3,null,null,4,5]
+<strong>Output:strong> [1,2,3,null,null,4,5]
+pre>
+
+<p><strong class="example">Example 2:strong>p>
+
+<pre>
+<strong>Input:strong> root = []
+<strong>Output:strong> []
+pre>
+
+<p>&nbsp;p>
+<p><strong>Constraints:strong>p>
+
+<ul>
+	The number of nodes in the tree is in the range [0, 104].
+	-1000 <= Node.val <= 1000
+ul>