labuladong.online Changelog

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2024/12/29

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

2024/12/24

Update the Visualization Panel Quick Reference to help readers quickly view key algorithm visualizations.
Add a Practice/Review Method for Exercises.

2024/12/22

Add visualization support for graph structures, detailed in the Visualization Panel User Guide.
Provide more detailed guidance in the website's visualization panel to help readers better understand algorithms through visualization. An example is shown below:

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:

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.

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 a bug related to the migration of Xiaoe-Tong site subscription permissions.
Resolved an issue where WeChat Pay would fail in certain situations.
Improved the problem of the website frequently prompting for language switch options.

2024/9/21

Fixed the issue of missing JavaScript code in some multi-language code tabs.
Verified and corrected errors in C++ code in the foundational knowledge section.
Resolved the issue of missing LeetCode links in the problem panel.
Fixed issues where some problems lacked multi-language solution codes.
Introduced a new notification component, addressing several known issues.

2024/9/19

Thanks to everyone's feedback, fixed issues with code formatting and missing content in some articles.
Added "Prerequisite Knowledge" to each article, displaying the number of problems this article can help solve under the title.

2024/9/18

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

Improved the issue of occasional GitHub login failures.
Enhanced network access speed for overseas readers.
Fixed issues where some readers were unable to modify comments.

2024/9/14

Added Reinforcement Exercises on Mathematical Techniques and Reinforcement Exercises on Union-Find.

2024/9/8

Major Improvements

Added dozens of exercises.
Added a Problem Summary Page to help readers easily view all reinforcement exercise sections.

2024/9/1

Major Improvements

The search bar at the top right of the website now supports direct search by problem number, English or Chinese problem name, problem link, and other information.

2024/8/25

Added reading progress markers to each article to easily determine if the article has been studied.
Included prerequisite knowledge at the beginning of articles to assist readers in understanding the content more smoothly.

2024/8/18

Major Improvements

Calibrated multi-language code snippets in all site articles to ensure code accuracy.
The website search box now supports direct search of LeetCode problem names 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:

2024/1/20

Major Bug Fix

Fixed the bug where the user ID would change with every login.

2024/1/15

Major Bug Fix

Fixed the bug causing delays in course access after successful WeChat/Alipay payments.

Fixed the issue of incorrect display of course/member unlock status.
Fixed several editor bugs, such as login failures and code execution issues.

2023/12/31

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

2023/10/29

Improved the display and navigation of LeetCode problems on the website.
Fixed the bug where the visualization panel could not be displayed in full screen during courses.
Added some visualization panels to aid understanding.

2023/10/2

Added a detailed introduction to the 《labuladong's Algorithm Notes》 paperback book.
Optimized the user experience of the 30-Day Challenge based on student feedback.

2023/8/29

Fully optimized the visualization panel, fixed several bugs, and significantly reduced unnecessary steps.
Updated the Visualization Panel User Guide comprehensively, adding practical scenario-based 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.