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In this video, I explain how Java HashSet works internally and why it is built on top of HashMap. You will learn: • What a HashSet ...

In this video, I walk through a real coding interview question exactly the way interviewers expect you to think and communicate.

Day 2 of my 365-day LeetCode challenge! In this video, I solve LeetCode Problem #3: Longest Substring Without Repeating ...

This video gives a summary of common Java data structures such as the ArrayList, HashSet, and HashMap. It also gives a ...

Learn how to solve the Happy Number problem (LeetCode 202) efficiently! In this video, we break down the logic behind ...

Learn how to solve the 'Contains Duplicate' coding interview problem efficiently using Hash Sets! In this video, we break down ...

Learn how to efficiently solve the 'Valid Sudoku' problem, a popular question in coding interviews! In this video, we break down ...

Learn how to efficiently solve the 'Subarray with Zero Sum' problem using the Prefix Sum and Hashing technique! In this video ...

Learn how to solve the 'Longest Word in Dictionary' problem (LeetCode 720) using two different approaches! In this video, we ...