Contains Duplicate in O(n) With a HashSet | LeetCode #217 (Easy)

In this video, I solve LeetCode #217 – Contains Duplicate in Java using a HashMap approach and walk through my thought process, debugging, and final solution. Problem: LeetCode 217 – Contains Duplicate Language: Java Difficulty: Easy Topics: Arrays, Hash Tables Approach: HashMap Time Complexity: O(n) Space Complexity: O(n) Full LeetCode Series:    • LeetCode Practice   #leetcode #java #codinginterview #algorithms #programming