labuladong.online Changelog

labuladongOriginalAbout 2781 words

2025/3/19

Major Update

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

The first game launched is Implement Snake Game. I have many interesting ideas that will gradually be integrated into the website. Stay tuned.

2025/3/9

Major Update

The segment tree section is fully updated with visual explanations and exercises, providing a unified AllInOneSegmentTree code implementation for easy application in problem-solving.

Step by step, from basic to advanced:

2025/3/1

Major Update

vscode plugin and JetBrains plugin now support local debugging of code. See the respective plugin documentation for details.

2025/2/20

Improved the use of accompanying plugins based on user feedback, with accompanying video explanations.

2025/2/9

Updated Recursive Algorithm Framework and video explanations.
Added a "Focus Mode" toggle in the top right corner of the PC website. When activated, the sidebar and top bar will be blurred to help focus, or to facilitate learning at work.

2025/1/25

Updated Segment Tree Principles and Code Template Implementation.

2025/1/19

Optimized Quick Mastery Directory with accompanying video explanations.
Added Video Introduction to the top ten sorting algorithms.

2025/1/4

Updated Greedy Algorithm Core Framework with an added visualization panel to aid understanding.
Updated Divide and Conquer Algorithm Core Framework with an added visualization panel to aid understanding.
Fixed several bugs.

Major Update

Video explanations are now being updated. See Homepage for more details.

2024/12/29

Rewrote BFS Algorithm Core Framework based on the new content structure of the website.

2024/12/24

Updated Visualization Panel Quick Reference to help readers easily view visualizations of key algorithms.
Added Exercise/Review Methods for Problems.

2024/12/22

Added visualization support for graph structures. See Visualization Panel User Guide for details.
Enhanced the website's visualization panel with more detailed guidance to help readers better understand the algorithm processes through visualization. An example is shown below:

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

Complex Structures and Recursion

2024/12/9

Enhanced the content of Further Exploration: Framework for Solving Common Ancestor Problems by adding visual aids for better understanding.
Improved the visual panels for Array Two-Pointer Techniques Summary with color coding for better comprehension.
Enhanced the visual panels for Linked List Two-Pointer Techniques Summary with color coding for better comprehension.
Enhanced the visualization of all dynamic programming recursive solutions by adding color coding to aid in understanding the state transition process, example:

Algorithm Visualization

2024/12/6

Major Update

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

2024/12/1

Major Update

To meet the diverse needs of our readers, we have introduced a Quick Access Directory. The plugin will also be optimized to cater to quick-access readers, so stay tuned.

2024/11/24

Resolved the slow loading issue of the comment section.
Fixed a bug in Red-Black Trees where node situations were incorrect under certain conditions.
Fixed a display error in Doubly Linked List.

2024/11/18

Significantly increased access speed for overseas readers, resolving issues where pages would freeze during loading.

2024/11/14

Streamlined the Core Framework of Backtracking Algorithms, organizing the N-Queens and Sudoku problems into Backtracking Practice: Sudoku and N-Queens Problems.
Enhanced the API of built-in data structures in the visual panel, detailed in the Visual Panel User Guide.

2024/11/10

Increased the number of results displayed in the top-right search box.
Added API documentation for each data structure in the Visual Panel User Guide.

2024/11/3

Added Perfect Balance and Visualization of Red-Black Trees.

2024/10/30

Major Upgrade

The visual panel now supports a color system, allowing for color customization of any object through annotated keywords and a page palette.

See Color System in Visual Panel for details.

2024/10/27

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

If you continue to encounter these issues, please try refreshing the page or clearing your browser cache to resolve them.

2024/10/21

Fixed a bug where the visualization panel could not display sorting algorithms.

2024/10/19

Added Core Principles of Union Find and Core Principles of Segment Trees.
Enhanced Basics of Trie Trees with a visualization panel for better understanding.

2024/10/13

Improved the content of Binary Heap by storing elements starting from index 0, and added support for the showArray method to display both the underlying array and the binary tree structure.
Updated the Heap Sort Algorithm.

2024/10/3

Major Enhancement

Introduced a new section for Series of Sorting Algorithms in the quick start guide, along with visualizations for sorting algorithms.

Insertion Sort

2024/10/1

Added visualization panels for all exercises in Backtracking Exercises I, Backtracking Exercises II, and Backtracking Exercises III.
Fixed an issue with the style of the check-in calendar.

2024/9/24

Fixed a bug where code blocks in the exercise section lacked a copy button.
Added visualization panels for all solution codes in BFS Exercises I and BFS Exercises II.
Fixed a bug where the previous and next page links in some sections would redirect to the homepage.

2024/9/22

Fixed the bug related to the migration of subscription permissions.
Resolved the issue where WeChat payments failed in certain scenarios.
Optimized the issue where the website always prompted for language switching options.

2024/9/21

Fixed the problem of missing JavaScript code in some multilingual code tabs.
Verified and corrected C++ code in the basic knowledge section.
Fixed the lack of redirect links to LeetCode on problem panels.
Resolved the issue of missing multilingual solution codes for some problems.
Introduced a new notification component to optimize several known issues.

2024/9/19

Thanks to feedback, fixed issues with code formatting errors and missing content in some articles.
Added "Prerequisite Knowledge" to each article, displaying the number of problems the article can solve below the title.

2024/9/18

Thanks to feedback, several bugs were fixed:

Optimized the issue of occasional GitHub login failures.
Improved network access speed for overseas readers.
Fixed the problem where some readers could not modify comments.

2024/9/14

Added Exercise: Math Skills Related Problems and Exercise: Union-Find Related Problems.

2024/9/8

Major Enhancements

Added dozens of exercises.
Added Exercise Summary Page to help readers easily access all exercise sections.

2024/9/1

Major Enhancements

The search bar at the top right of the website now supports searching articles directly by problem number, titles in Chinese or English, and problem links.

2024/8/25

Added reading progress markers to each article, making it easier to determine if an article has been studied.
Added prerequisite knowledge points at the beginning of articles for smoother learning and understanding.

2024/8/18

Major Enhancements

Calibrated multilingual code snippets in all articles to ensure code accuracy.
The website search box now supports direct searches for LeetCode problem titles and numbers.

2024/7/17

Major Bug Fix

Fixed an issue where nodes were not displayed when constructing binary/multi-way trees in the visualization panel.

Major Improvement

The primary language of the website has been standardized to Java.

2024/7/1

Fixed a bug where the visualization panel in the exercise section would not load.

Major Improvement

Significantly improved the accuracy of multilingual solutions in exercises.

2024/6/15

Enhanced reading experience and updated code style.
Updated foundational knowledge on binary heaps and binary trees. See the "Data Structures and Sorting Explained" section in the main site directory for details.
Improved the Order Page to display gifted site subscriptions and their validity for long-time users.

Bug Fixes

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

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

2024/5/10

Unified website icon style and optimized various other details.
Fixed a bug where a successful login on mobile redirected to a 404 page.

2024/5/1

Added several foundational knowledge topics and optimized various content areas.
Added a foundational knowledge section.

2024/3/26

Fixed a bug where some links in member articles still pointed to the old course version.
Fixed a bug where comments could not be loaded even after logging in.
Fixed a bug where comments could not be made after logging in with GitHub.

2024/2/26

Supported overseas readers using GitHub accounts to log in to the website.

2024/2/22

Supported reading history for articles. In the sidebar, completed articles will be marked with , and incomplete articles with , helping you track your learning progress.
Supported readers in modifying and deleting their comments.
Fixed some links leading to 404 errors.

2024/2/21

Support for direct payment initiation within WeChat.

One-Click Login in WeChat

Logging into the website on a PC requires scanning a QR code with WeChat, but it's cumbersome to log in from a mobile device as you need to take a screenshot of the QR code and upload it to WeChat.

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

2024/2/17

Bug Fix

Fixed a bug causing 404 errors in site search due to optimization of the URL generation algorithm for website articles.

2024/2/15

Support for Overseas PayPal Payments

Many overseas readers reported difficulties using local WeChat and Alipay payment options. Now, PayPal is supported for overseas readers to purchase courses conveniently.

Domestic users should not use PayPal, as PayPal transactions between two Chinese accounts are not allowed and will result in an error stating "This transaction has been declined to comply with international regulations."

2024/2/10

Breaking Change

Optimized the URL generation algorithm for website articles to avoid URL changes due to directory structure modifications.

Previously bookmarked article links might become invalid; if you encounter a 404 error when navigating to certain pages, it might be due to old browser cache. Please clear your browser cache and try again.

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

2024/2/5

Major Bug Fix

The check-in calendar for Check-in Challenge was incorrectly displaying missing check-ins in overseas time zones. This issue has been fixed.

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

2024/2/1

Breaking Change

The new website labuladong.online is officially launched, significantly enhancing the user experience. All courses from Xiaoetong have been migrated to the new website. Previous paying users can transfer their course access to the new site. Migration guide available here. The method for unlocking course-specific solutions via plugins has been updated in the first chapter of the courses.

Major Update

An "Edit" button has been added to the algorithm visualization panel on the new website, allowing readers to modify and execute the code in the algorithm visualization panel. Example:

Algorithm Visualization

2024/1/20

Major Bug Fix

Resolved the bug causing user ID to change with each login.

2024/1/15

Major Bug Fix

Fixed the delay in course access permissions after successful payment via WeChat/Alipay.

Corrected errors in displaying course/subscription unlock status.
Resolved several editor bugs, such as login failures and inability to execute code.

2023/12/31

Launched the visual online editor: https://labuladong.online/algo-visualize

2023/10/29

Improved display and navigation of LeetCode problems on the website.
Fixed the bug preventing full-screen display of visualization panels in courses.
Added some visualization panels to aid understanding.

2023/10/2

Added detailed introduction of the Printed Book of Labuladong's Algorithm Notes.
Enhanced the user experience of the 30-Day Challenge based on participant feedback.

2023/8/29

Comprehensive optimization of visualization panels, fixing several bugs and significantly reducing redundant steps.
Fully updated the Guide to Using Visualization Panels, adding scenario-based practical teaching sections.

2023/8/24

Added a draggable divider in the middle of the visualization panel.
The visualization panel can now highlight the recursive path on the recursion tree.

2023/8/21

Fixed a bug where multi-language code and inline comments were not displayed when learning courses on the webpage.
Improved member user notifications based on feedback, added a "Report an Issue" button.

2023/8/19

Added video introductions for the problem-solving series plugin.
Enhanced the style of the algorithm visualization panel to make it more noticeable.

2023/8/10

Upgraded the algorithm visualization panel functionality, allowing code to be clicked and directed to the corresponding execution steps:

2023/7/27

Fixed the issue where language tabs could not be switched in member-unlocked content.
Moved the content directory of Problem-Solving Challenge to the website for easier reference.
Added a homepage link, accessible by clicking the logo in the top left corner.

2023/7/19

Fixed the bug where the theme of the comments section did not match the website theme.

2023/7/13

Added a User Manual for the algorithm visualization feature in Chapter 1.
Added two buttons in the top right corner of the visualization panel: one to copy the URL of the algorithm visualization panel and the other to refresh the panel (useful if the animation fails to load):

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

Added an update log for the website and various plugins to keep users informed about updates.

2023/7/1

Upgraded the visualization feature to support visualizing all recursive algorithms from a tree perspective:

2023/6/27

Fixed bugs in algorithm visualization and added visualization for 50 problems.
Enabled interaction between the Chrome plugin and the website, displaying the plugin connection status in the top right corner of the webpage.

2023/6/25

Added a reading history feature: read articles will show a icon, and unread articles will show a icon.

2023/6/20

Launched a new theme to fully optimize the user experience.