06-09 [LeetCode][167. Two Sum II - Input Array Is Sorted] 4 Approaches: Brute Force, HashMap, Binary Search, Two Pointers
03-19 [Leetcode][895. Maximum Frequency Stack] 2-Steps to Master the HashMap Solution with Detailed Explanation
02-07 [Leetcode][242. Valid Anagram] 3 Solutions: HashMap, Counting and Sorting, while Counting is the Fastest