Add solution #297

Author: JoshCrozier

README.md

@@ -229,6 +229,7 @@
 290|[Word Pattern](./0290-word-pattern.js)|Easy|
 292|[Nim Game](./0292-nim-game.js)|Easy|
 295|[Find Median from Data Stream](./0295-find-median-from-data-stream.js)|Hard|
+297|[Serialize and Deserialize Binary Tree](./0297-serialize-and-deserialize-binary-tree.js)|Hard|
 303|[Range Sum Query - Immutable](./0303-range-sum-query-immutable.js)|Easy|
 306|[Additive Number](./0306-additive-number.js)|Medium|
 316|[Remove Duplicate Letters](./0316-remove-duplicate-letters.js)|Medium|

solutions/0297-serialize-and-deserialize-binary-tree.js

@@ -0,0 +1,42 @@
+/**
+ * 297. Serialize and Deserialize Binary Tree
+ * https://leetcode.com/problems/serialize-and-deserialize-binary-tree/
+ * Difficulty: Hard
+ *
+ * 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.
+ *
+ * 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.
+ */
+
+/**
+ * Definition for a binary tree node.
+ * function TreeNode(val) {
+ *     this.val = val;
+ *     this.left = this.right = null;
+ * }
+ */
+
+/**
+ * Encodes a tree to a single string.
+ *
+ * @param {TreeNode} root
+ * @return {string}
+ */
+var serialize = function(root) {
+  return JSON.stringify(root);
+};
+
+/**
+ * Decodes your encoded data to tree.
+ *
+ * @param {string} data
+ * @return {TreeNode}
+ */
+var deserialize = function(data) {
+  return JSON.parse(data);
+};