feat(work): add new Easy difficulty problems for Hash Table and Two Pointers modules

work/Easy/Two Pointers/344.reverse-string.js

@@ -0,0 +1,49 @@
+/*
+ * 344. Reverse String
+ * Difficulty: Easy
+ * https://leetcode.com/problems/reverse-string/
+ * 
+ * ──────────────────────────────────────────────────
+ * 
+ * Write a function that reverses a string. The input string is given as
+ * an array of characters s.
+ * 
+ * You must do this by modifying the input array in-place with O(1)
+ * extra memory.
+ * 
+ *  
+ * 
+ * Example 1:
+ * 
+ * Input: s = ["h","e","l","l","o"]
+ * Output: ["o","l","l","e","h"]
+ * 
+ * Example 2:
+ * 
+ * Input: s = ["H","a","n","n","a","h"]
+ * Output: ["h","a","n","n","a","H"]
+ * 
+ *  
+ * 
+ * Constraints:
+ * 
+ * 	• 1 <= s.length <= 10^5
+ * 
+ * 	• s[i] is a printable ascii character.
+*/
+
+/**
+ * @param {character[]} s
+ * @return {void} Do not return anything, modify s in-place instead.
+ */
+var reverseString = function(s) {
+
+    let i = 0;
+    let j = s.length - 1;
+    
+    while (i < j) {
+        [s[i], s[j]] = [s[j], s[i]];
+        j--;
+        i++;
+    }
+};