Add solution #535

Author: JoshCrozier

README.md

@@ -1,4 +1,4 @@
-# 1,397 LeetCode solutions in JavaScript
+# 1,398 LeetCode solutions in JavaScript
 
 [https://leetcodejavascript.com](https://leetcodejavascript.com)
 
@@ -427,6 +427,7 @@
 529|[Minesweeper](./solutions/0529-minesweeper.js)|Medium|
 530|[Minimum Absolute Difference in BST](./solutions/0530-minimum-absolute-difference-in-bst.js)|Easy|
 532|[K-diff Pairs in an Array](./solutions/0532-k-diff-pairs-in-an-array.js)|Medium|
+535|[Encode and Decode TinyURL](./solutions/0535-encode-and-decode-tinyurl.js)|Medium|
 537|[Complex Number Multiplication](./solutions/0537-complex-number-multiplication.js)|Medium|
 538|[Convert BST to Greater Tree](./solutions/0538-convert-bst-to-greater-tree.js)|Medium|
 539|[Minimum Time Difference](./solutions/0539-minimum-time-difference.js)|Medium|

solutions/0535-encode-and-decode-tinyurl.js

@@ -0,0 +1,45 @@
+/**
+ * 535. Encode and Decode TinyURL
+ * https://leetcode.com/problems/encode-and-decode-tinyurl/
+ * Difficulty: Medium
+ *
+ * TinyURL is a URL shortening service where you enter a URL such as
+ * https://leetcode.com/problems/design-tinyurl and it returns a short URL such as
+ * http://tinyurl.com/4e9iAk. Design a class to encode a URL and decode a tiny URL.
+ *
+ * There is no restriction on how your encode/decode algorithm should work. You just
+ * need to ensure that a URL can be encoded to a tiny URL and the tiny URL can be
+ * decoded to the original URL.
+ *
+ * Implement the Solution class:
+ * - Solution() Initializes the object of the system.
+ * - String encode(String longUrl) Returns a tiny URL for the given longUrl.
+ * - String decode(String shortUrl) Returns the original long URL for the given shortUrl.
+ *   It is guaranteed that the given shortUrl was encoded by the same object.
+ */
+
+const map = new Map();
+let counter = 1;
+
+/**
+ * Encodes a URL to a shortened URL.
+ *
+ * @param {string} longUrl
+ * @return {string}
+ */
+var encode = function(longUrl) {
+  const shortUrl = 'https://tinyurl.com/' + counter.toString();
+  map.set(shortUrl, longUrl);
+  counter++;
+  return shortUrl;
+};
+
+/**
+ * Decodes a shortened URL to its original URL.
+ *
+ * @param {string} shortUrl
+ * @return {string}
+ */
+var decode = function(shortUrl) {
+  return map.get(shortUrl) || null;
+};