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Welcome to Debug Duck, Learn software engineering, programming, and technology in a simple and practical way. Tips, insights ...

In this video, we solve the problem “Substrings with K Distinct” using an efficient Sliding Window technique. You are given a string ...

Built LeetCode 706 Design HashMap NO built-in Library! put/get/remove method Core: Buckets (lists) + hash % prime. Collisions?

Записаться на мок-интервью в ШОРТКАТ: https://shortcut.education. This video explains the thread safety of ...

Learn how to solve the "Copy List with Random Pointer" problem (LeetCode 138) efficiently! In this video, we explore the ...

NeetCode 150 | Valid Anagram Explained | 3 Approaches | Complete DSA Series In this video, we solve the LeetCode problem ...

Substrings With K Distinct Characters | GFG POTD 10 January 2026 | Java, C++, Python, JavaScript Substrings with K distinct ...

Learn how to implement a Least Frequently Used (LFU) Cache with O(1) time complexity! In this video, we break down one of ...

Welcome to Lecture 29 of the DSA Series in Telugu! 💻🔥 In this video, we’ll solve one of the most interesting Sliding Window + ...

Collection Types in 60 Seconds ⚡ Specialized data structures for storing and managing groups of elements. Like different ...

Welcome to Day 6 of my 100 Days DSA Challenge In this video, I have explained the Remove Duplicates from SOrted Array ...

Covering some data structures in Java which are a little more complex. I'll cover Arrays, ArrayLists, HashMaps and HashSets as ...

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 ...

Day 3 of my 365‑day LeetCode challenge! In this video, I solve LeetCode Problem #49: Group Anagrams using Java. Efficient ...

Day 24 of 30 Days | Java Interview Questions ❓ What is hashCode() in Java? #️⃣ hashCode() returns an integer value that ...