AlgoRung

Learn Data Structures & Algorithms one rung at a time.

AlgoRung explains coding interview problems with step-by-step animations: you watch the algorithm run: every pointer move, table cell and tree call, with the code highlighted line by line, and a clear explanation of why it works.

Every video follows the same path:
- the concept you need, from zero
- the problem and a brute-force solution
- the optimal approach, traced step by step
- time & space complexity, edge cases and Java code

231 problems across Arrays, Binary Search, Linked Lists, Stacks, Trees, Graphs, Heaps, Tries, Dynamic Programming, Backtracking and more, in roadmap order, from beginner to interview-ready.

Practise every problem with notes and spaced revision at https://algorung.com

New to DSA? Start with the playlists in order.