LeetCodeAnimation: Animated LeetCode Walkthroughs
/LeetCodeAnimation
LeetCodeAnimation is a GitHub library of animated walkthroughs for 256 LeetCode problems, showing pointer movement, state changes, or recursion step by step. The GitHub copy is a historical index of GIFs and notes; the real interactive player, with rewind and speed control, lives on algomooc.com. Reach for the repo to browse by topic or grab reference solutions in Python, C++, or Java; skip it if you want the step-through animation itself.
Understanding LeetCodeAnimation
LeetCodeAnimation is MisterBooo's collection of animated explanations for LeetCode problems, built around visualizing how an algorithm runs โ how a pointer moves, how a hash map fills in, how DFS spreads across a grid โ instead of just printing a solution. The repo holds 256 synced problems with Python, C++, and Java code and GIF previews, while the full step-by-step, rewind, and voice-narrated player is hosted on algomooc.com.
Key Features for Algorithm Learning
- โ256 LeetCode problems are indexed in this repo, split into 71 easy, 160 medium, and 25 hard, per the README's own count table.
- โEach problem ships reference solutions in three languages โ Python, C++, and Java โ with Python set as the default per the project's 2026 update.
- โGIF previews for select problems (Two Sum, Trapping Rain Water, Number of Islands, Linked List Cycle among them) sit right in the README, linking through to the full animation on the website.
- โA structured JSON manifest (docs/data/manifest.json) backs auto-generated indexes โ one sorted by problem number, one grouped by topic โ so scripts, not manual edits, keep the lists current.
- โAn AI tutor called 'Xiao Ou,' modeled on the project's creator, answers questions about approach and edge cases when a learner is stuck, according to the README.
- โAI-synthesized narration using a licensed voice of the creator plays alongside the animations on the website, triggered by a speaker icon in the player.
- โThe repo tracks its own sync history in docs/sync-log.md, and a maintainer section documents the exact scripts (review:site, sync, validate, build-readme) used to pull new content back from the website.
Who Benefits from Animated Explanations?
- โขStudying a specific LeetCode problem before an interview and wanting the pointer or recursion mechanics animated rather than reading a written editorial.
- โขPulling ready-made Python, C++, or Java reference solutions to compare against your own attempt on one of the 256 indexed problems.
- โขBrowsing by topic through docs/index-by-topic.md when you're drilling a specific pattern, like two pointers or DFS, instead of grinding problems at random.
- โขFollowing the project's own progress as it works through what it calls a full quality pass on its animations, tracked in docs/sync-log.md.
Strengths
- โ256 problems is a workable, browsable set rather than an unstructured pile of solutions, and it's broken down into easy/medium/hard right in the index.
- โReference code in three languages per problem saves the work of translating a Python solution into Java or C++ yourself.
- โThe manifest-driven indexes (by number, by topic) make the repo genuinely searchable instead of a folder of loose animation files.
- โThe GIF previews in the README let you judge whether the animation style helps you before clicking through to the site.
GitHub Repo vs. Full Website Experience
- โณThe GitHub repo is explicitly described as a public index and historical archive. Full step-through playback, rewind, speed control, and voice narration only work on algomooc.com, not in this repository.
- โณThe 256-problem count here is a subset of a larger, in-progress 299-problem set the README says lives on the website, so the repo undercounts what the project actually covers.
- โณNo license is stated in the facts available for this repo, so reuse terms for the animations or code aren't confirmed here.
- โณThe 'Xiao Ou' AI tutor and the voice narration both depend on the live website and an AI-synthesized voice, not anything you get by cloning the repo.
- โณGitHub's language stat shows Java as the primary language, but the README says Python is now the default reference solution, which can be confusing if you're browsing by file type.
Other LeetCode Learning Resources
Frequently Asked Questions
This repository indexes 256 animated LeetCode problems, broken down as 71 easy, 160 medium, and 25 hard, according to the README's own count table.
Each problem in LeetCodeAnimation ships reference solutions in Python, C++, and Java, with Python set as the default language as of the project's 2026 update.
The full LeetCodeAnimation experience is not available directly on GitHub. The repo works as a public index and historical archive of GIFs and notes, while step-by-step playback, rewind, speed control, and voice narration only run on the website version at algomooc.com.
AlgoMooc.com is the website version of LeetCodeAnimation, hosted at algomooc.com/leetcode-animation, where the interactive player, full animation steps, and voice narration actually live. The GitHub repo syncs its index and reference code back from that site.
LeetCodeAnimation's README points to docs/README-En.md for an English version of the project documentation; most of the main README and site content is written in Chinese.
LeetCodeAnimation's website version offers an AI tutor called 'Xiao Ou' to answer questions when you're stuck, plus AI-synthesized voice narration using a licensed voice of the creator, playable through a speaker icon in the animation player.
Who should try it โ and who should skip
Try LeetCodeAnimation if you learn algorithms better by watching a mechanism move than by reading a paragraph explaining it, and you don't mind treating the GitHub repo as an index that sends you to algomooc.com for the actual playback. Skip it if you need everything self-contained in the repo you clone: the interactive animation, the AI tutor, and the voice narration are website features, not files sitting in this codebase.
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Is LeetCodeAnimation worth your time?
ChatGPT, Claude and Perplexity can all read this page. Ask one of them what it makes of LeetCodeAnimation.