labuladong.online Changelog

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2025/4

Fixed an issue where some readers could not load icons, resulting in reading history not being displayed.
Added Dynamic Programming Algorithm Exercise Set.
Added a video explanation to Core Framework of Dynamic Programming.
Added Huarong Road Game and Link Link Game to practice the BFS Algorithm.

2025/3

Major Update

The website now supports a game engine, allowing you to write algorithms to play games, providing a more engaging learning experience.

The first game available is Implementing Snake Game. I have many more interesting ideas, which will be gradually integrated into the website. Please stay tuned.

Major Update

The segment tree section has been fully updated, including visual explanations and exercises, and provides a unified AllInOneSegmentTree code implementation for easy use during problem solving.

Step by step, from basic to advanced:

Major Update

vscode plugin and JetBrains plugin now support local code debugging. For details, see the corresponding plugin documentation.

2025/2

Optimized the use of supporting plugins based on user feedback, with accompanying video explanations.
Updated Recursive Algorithm Framework and video explanations.
Added a "Focus Mode" switch to the upper right corner of the PC website. Activating focus mode will blur the sidebar and top bar, making it easier to concentrate or study at work.
Updated Principles and Code Template of Segment Tree.
Optimized Quick Mastery Directory with accompanying video explanations.
Added Video Guide to the top ten sorting algorithms.
Updated Greedy Algorithm Core Framework with a visualization panel for better understanding.
Updated Divide and Conquer Algorithm Core Framework with a visualization panel for better understanding.
Fixed several bugs.

Major Updates

Started updating video explanations, see Site Homepage.

2024/12

Rewrote BFS Algorithm Core Framework based on the new content structure of the website.
Updated Visualization Panel Quick Reference for easy access to key algorithm visualizations.
Added Exercise and Review Methods for Problems.
Added visualization support for graph structures, see Visualization Panel Usage Documentation.
The visualization panel on the website now includes more detailed guidance, helping readers better understand algorithms through visualization. Example below:

The following algorithm will find all paths from node 0 to node 4. You can click the line if (s === n - 1) multiple times to observe the graph traversal and the growth of the recursion tree:

Complex Structures and Recursion

Enhanced the content of Extension: Solving Framework for the Lowest Common Ancestor Series with visual panels to aid understanding.
Improved the visual panels of Summary of Array Two-Pointer Techniques with color assistance for better comprehension.
Enhanced the visual panels of Summary of Linked List Two-Pointer Techniques with color assistance for better understanding.
Optimized the visualization of all dynamic programming recursive solutions, adding colors to aid in understanding the state transition process, example:

Algorithm Visualization

Major Update

In response to readers' requests, the site's reading history now supports cross-device synchronization. After logging into the site on any device, the directory page and links within the articles will display and to indicate reading progress.

Major Update

To meet the diverse needs of readers, a new Quick Mastery Catalog has been added. The plugin will also be optimized for the needs of quick mastery readers, so stay tuned.

2024/11

Resolved the bug causing slow loading in the comments section.
Fixed the bug in Red-Black Tree where node conditions were incorrect in some cases.
Corrected the display error in Doubly Linked List.
Significantly improved the access speed for overseas readers, resolving page loading issues that caused freezing in some cases.
Simplified the Core Framework of Backtracking Algorithm, organizing the N-Queens and Sudoku problems into Backtracking Algorithm Practice: Sudoku and N-Queens Problem.
Optimized the built-in data structure APIs in the visual panels, see Documentation for Using Visual Panels.
Increased the number of results that can be displayed in the search box at the top right.
Added API documentation for each data structure in the Documentation for Using Visual Panels.
Added Perfect Balance and Visualization of Red-Black Trees.

2024/10

Major Upgrade

The visual panel now supports a color system, allowing modification of any object's color via annotation keywords and page palettes.

See Color System of Visual Panels.

Fixed the bug where the visual panel displayed 404 Resource Not Found.
Resolved the bug where some articles displayed Fail to fetch data.

If you still encounter the above issues, please try refreshing the page or clearing the browser cache to resolve them.

Fixed the bug where the visualization panel could not display sorting algorithms.
Added Core Principles of Union Find and Core Principles of Segment Trees.
Added a visualization panel to Introduction to Trie Trees to aid understanding.
Optimized the content of Binary Heap to store elements starting from index 0 and support displaying both the underlying array and binary tree structure using the showArray method.
Updated the Heap Sort Algorithm.

Significant Improvements

The Quick Mastery section includes new explanations of Series of Sorting Algorithms with accompanying visualizations.

Insertion Sort

Added visualization panels for all problems in Backtracking Algorithm Exercises I, Backtracking Algorithm Exercises II, Backtracking Algorithm Exercises III.
Fixed the bug with the calendar style error.

2024/9

Thanks to everyone's feedback, several bugs were fixed:

Optimized the occasional GitHub login failure issue.
Improved network access speed for overseas readers.
Fixed the issue where some readers couldn't edit comments.
Added 【Exercise】Mathematical Skills Exercises and 【Exercise】Union-Find Exercises.

Major Enhancements

Added dozens of exercises.
Added Exercise Summary Page for readers to easily view all reinforcement exercise sections.

Major Enhancements

The search bar in the upper right corner of the website now supports searching related articles by problem number, English or Chinese problem title, problem link, etc.

2024/8

Added reading progress markers to each article to help determine if the article has been studied.
Added prerequisite knowledge points at the beginning of articles to facilitate smoother learning and understanding of the content.

Major Enhancements

Calibrated all multilingual code snippets across the site to ensure code accuracy.
The website search box now supports direct search by LeetCode problem name and number.

Fixed the bug where the visualization panel in the exercises section could not load.

Major Bug Fix

Fixed the issue where nodes were not displayed when constructing binary/multiway trees in the visualization panel.

Major Improvement

Unified the main language of the website to Java.

Major Improvement

Significantly improved the accuracy of multilingual solutions in exercises.

2024/5

Optimized reading experience and updated code style.
Updated the basics of binary heaps and binary trees. Please refer to the "In-depth Study of Data Structures and Sorting" section in the main directory.
Optimized the Order Page, displaying gifted site subscription orders and validity for old users.

Bug Fix

Fixed the bug where the like/dislike function in the website comment section caused the count to reset.

Fixed the bug where the visualization panel function buttons were missing.

Unified the website icon style and several other detailed optimizations.
Fixed the bug where successful mobile login redirected to a 404 page.
Added several basic knowledge sections and optimized some content.
Added a basic knowledge chapter.

2024/2

Fixed the bug where some links in member articles still pointed to the old course.
Fixed the bug where comments could not load even after logging in.
Fixed the bug where comments could not be made after logging in with GitHub.
Supported overseas readers using GitHub accounts to log in to the site.
Supported reading history of articles. In the sidebar, learned articles will show a mark, while unfinished articles will show a mark, helping you track your learning progress.
Supported readers to modify and delete their own comments.
Fixed some 404 link issues.
Support for direct payment within WeChat.

One-Click WeChat Login Supported

Logging in to the website on PC requires scanning a QR code with WeChat. However, logging in on mobile can be troublesome, as you need to screenshot the QR code and scan it in WeChat.

Now, one-click login is supported on mobile. Simply open the website in WeChat on your phone, click the "Login" button, and authorize the website to read your nickname to log in directly.

Bug Fix

Fixed a bug where the optimization of the article URL generation algorithm caused 404 errors in site search.

PayPal Payment Supported for Overseas Users

Many overseas readers reported being unable to use WeChat Pay or Alipay from China. PayPal payment is now supported to make it easier for overseas readers to purchase courses.

Note: Chinese users should not use PayPal, as PayPal does not allow transactions between two Chinese accounts. Attempting this will result in an error: "To comply with international regulations, this transaction has been declined."

Breaking Change

Optimized the website article URL generation algorithm to avoid URL changes caused by directory structure updates.

Previously saved article links may become invalid. If you encounter a 404 error when navigating to a page, it may be due to old browser cache. Please clear your browser cache and try again.

Completely removed outdated links to Xiaoetong in the new website and plugins.

Major Bug Fix

The Check-in Challenge calendar could display missed check-ins incorrectly in overseas time zones. This issue has now been fixed.

Course videos now support keyboard controls: use the left and right arrow keys to fast forward or rewind, the up and down arrows to adjust volume, and the spacebar to pause or play.
Various other minor bug fixes and experience optimizations.

Breaking Change

The new website labuladong.online is officially launched, offering a fully optimized user experience. All Xiaoetong courses have been migrated to the new site. Previous paid readers can transfer their course access to the new website. Migration instructions can be found here. The method to unlock course-exclusive solutions in the plugin based on the new website has been updated in the first chapter of the course.

Major Update

An "Edit" button has been added to the algorithm visualization panel on the new website. Readers can modify and execute the code directly in the visualization panel. Example:

Algorithm Visualization

2024/1

Major Bug Fixes

Fixed the bug where the user ID changes with each login.

Major Bug Fixes

Fixed the bug causing delays in course access after WeChat/Alipay payment success.

Fixed issues with course/subscribe status display errors.
Fixed various bugs in the editor, such as login failures and code execution issues.

2023/12

Launched the visual online editor: https://labuladong.online/algo-visualize
Optimized the display and navigation of LeetCode problems on the website.
Fixed the bug preventing full-screen display of the visualization panel in courses.
Added some visualization panels to aid understanding.
Added detailed introduction of the “Labuladong’s Algorithm Notes” printed book.
Improved the user experience of the 30-day Challenge based on user feedback.

2023/8

Comprehensive optimization of the visualization panel, fixing several bugs, and significantly reducing unnecessary steps.
Completely updated the Visualization Panel User Guide, adding practical scenario-based teaching sections.
Added draggable dividers in the middle of the visualization panel.
The visualization panel can now highlight the recursive paths on the recursion tree.

Fixed bugs where multilingual code and inline comments could not be displayed while learning courses on the website.
Optimized membership prompts based on feedback from subscribers, adding a "Report an Issue" button.
Added video introductions for the series of exercise plugins.
Added more prominent styles to the algorithm visualization panel.
Upgraded the algorithm visualization panel functionality, allowing code to be clicked directly to jump to the corresponding execution steps:

2023/7

Fixed issues where language tabs could not be switched in subscriber-unlocked content.
Moved the content directory of Exercise Challenge to the website for easier access.
Added a homepage, accessible by clicking the logo in the top left corner.
Fixed bugs where the theme of the comment section did not match the website theme.
Added a User Manual for algorithm visualization to the first chapter.
Added two buttons in the top right corner of the visualization panel to support copying the URL of the algorithm visualization panel and refreshing it (useful when animations fail to load):

Optimized the display style of "Related Articles" at the end of each article.

Added update logs for the website and various plugins for better understanding of updates.
Upgraded visualization functionality to support visualizing all recursive algorithms from a tree perspective:

2023/6

Fixed bugs in algorithm visualization and added visualization for 50 problems.
Supported Chrome Plugin integration with the website, displaying plugin connection status in the top right corner of the webpage.
Added reading history feature, showing a mark for read articles and a mark for unread articles.
Launched a new theme, comprehensively optimizing the user experience.