LeetCode Solutions by azl397985856: 200+ Problems
/leetcode
LeetCode Solutions by azl397985856 is worth bookmarking if you want annotated problem write-ups that explain the reasoning, not just the final code. Reach for it when you're grinding LeetCode topic by topic and want a companion summary on binary search, dynamic programming, or union-find. Skip it if you need English-first material or a graded course, since this reads like a personal solving journal, not a curriculum.
What is the LeetCode Solutions repository?
LeetCode Solutions by azl397985856 is a Chinese-language GitHub repository collecting one developer's LeetCode write-ups, algorithm summaries, and a companion ebook. The README splits it into five parts: classic problem solutions, algorithm and data-structure explainers, Anki flashcards, a community daily-problem thread, and a backlog of planned additions. It grew out of a 91-day study challenge and later inspired a published book.
Key resources in this LeetCode guide
- ✓200+ annotated problem write-ups that walk through the approach and the key insight before showing code, not just the final answer.
- ✓A ./thinkings/ folder of algorithm and data-structure explainers covering binary search, dynamic programming, backtracking, union-find, bloom filters, tries, and monotonic stacks.
- ✓Anki flashcard decks built from the LeetCode problems, meant for spaced-repetition review instead of one-off reading.
- ✓A companion ebook of the repo's own content — explicitly not the same as the author's separately published print book — free to read on GitBook.
- ✓A 91-day structured study challenge (91 天学算法) with its own handouts, including a two-part binary search unit.
- ✓A browser extension, 'LeetCode Cheatsheet,' distributed through the Chrome Web Store for use while solving on leetcode.cn/com.
- ✓A shared 'Interview Cheat Sheet' PDF outlining a 15-step interview walkthrough and three code-quality criteria: readability, time complexity, space complexity.
- ✓Selected long-form articles on specific problems, including a two-part breakdown of ByteDance's algorithm interview questions.
Using this guide for coding interview prep
- •Pull up the matching ./thinkings/ write-up before attempting a problem category you haven't drilled yet, like union-find or sliding window.
- •Work through the 91-day challenge on a fixed cadence instead of solving LeetCode problems at random.
- •Import the Anki deck to keep previously solved problems in spaced-repetition rotation instead of re-solving them from scratch.
- •Read the ByteDance-specific interview question breakdowns before a China-based tech interview loop.
- •Install the Chrome extension to keep a cheat sheet visible while solving on the actual LeetCode site.
Advantages of this LeetCode problem-solving journey
- ✓Explanations show the reasoning path, not just working code — useful when you're stuck on why a particular approach applies.
- ✓The ./thinkings/ topic explainers double as a review reference independent of any single problem.
- ✓A free companion ebook and a Chrome extension extend the repo past plain markdown files.
- ✓An English README exists, so the repo isn't closed off to readers who don't speak Chinese and just want the file index.
Considerations for using this LeetCode guide
- △Most write-ups and nearly all discussion — WeChat/QQ groups, the 91-day activity signup, 1-on-1 tutoring — are Chinese-only; the English README covers navigation, not translated content.
- △It's a personal solving log, not a curriculum — no grading, no prerequisites, and no guarantee a given write-up is as deep as another.
- △The free ebook comes with a note that it 'may start charging later,' so its long-term availability isn't guaranteed.
- △The Interview Cheat Sheet PDF is credited to an external source the author 'found online,' not original repo content.
Other platforms for LeetCode practice
Frequently Asked Questions
LeetCode Solutions by azl397985856 ships an English README (./README.en.md) for navigating the repo, but the problem write-ups, ./thinkings/ explainers, and community activity are primarily in Chinese.
LeetCode Solutions by azl397985856 runs a 91-day learning activity (91 天学算法) that acts as a structured path, plus standalone ./thinkings/ topic summaries on binary search, dynamic programming, and more for readers who don't want the full 91-day commitment.
The repository's GitHub topics list JavaScript, Java, Python, and C++, indicating multiple languages appear across the write-ups, though the README's file index doesn't label each solution's language individually.
LeetCode Solutions by azl397985856 offers a free companion ebook of the repository's own content, read online via GitBook — the README says this is separate from the author's paid print book, 算法通关之路, and notes the free ebook 'may start charging later.'
The README lists the author's own LeetCode Premium referral discount (extra free months on annual and quarterly plans) alongside a link to buy the author's separate print book, 算法通关之路.
Who should try it — and who should skip
Developers doing a serious multi-week LeetCode grind who read Chinese, or don't mind machine-translating the problem folders, get the most out of this — the topic explainers and Anki cards support a repeat-and-review habit. Skip it if you want English-first content, a graded course structure, or one canonical solution per problem instead of a single author's evolving personal notes.
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