Skip to content

Conversation

romankurnovskii
Copy link
Owner

@romankurnovskii romankurnovskii commented Aug 28, 2025

Summary

Add comprehensive explanation and Python solution for LeetCode problem 89 (Gray Code).

New Features

  • Add detailed Markdown explanation for problem 89 following the established rule structure
  • Implement Python solution using reflection method for optimal performance
  • Use tex instead of text for code blocks as requested

Documentation

  • Problem 89: Gray Code [Medium]
  • Category: Math, Backtracking, Bit Manipulation
  • Approach: Reflection method to build Gray codes recursively
  • Time Complexity: O(2ⁿ)
  • Space Complexity: O(2ⁿ)

Key Implementation Details

  • Uses the reflection method to build larger Gray codes from smaller ones
  • Efficiently generates sequences by reflecting and adding appropriate prefixes
  • Handles edge cases and provides clean, well-commented code
  • Demonstrates advanced bit manipulation techniques

Files Added

  • explanations/89/en.md - Comprehensive problem explanation with strategy and step-by-step walkthrough
  • solutions/89/01.py - Clean Python solution with proper documentation

The solution demonstrates an elegant mathematical approach to generating Gray codes, making it an excellent example for learning bit manipulation and recursive problem-solving techniques.

Summary by Sourcery

Add comprehensive explanation and Python solution for LeetCode problem 89 (Gray Code), including a detailed Markdown walkthrough and an efficient reflection-based implementation

New Features:

  • Add detailed Markdown explanation for LeetCode problem 89 (Gray Code) following the established structure
  • Implement Python solution for Gray Code using the reflection method

Enhancements:

  • Switch code block syntax to use tex for improved formatting

Documentation:

  • Provide comprehensive problem description, examples, constraints, strategy, and complexity analysis in explanations/89/en.md

Copy link

coderabbitai bot commented Aug 28, 2025

Warning

Rate limit exceeded

@romankurnovskii has exceeded the limit for the number of commits or files that can be reviewed per hour. Please wait 14 minutes and 36 seconds before requesting another review.

⌛ How to resolve this issue?

After the wait time has elapsed, a review can be triggered using the @coderabbit review command as a PR comment. Alternatively, push new commits to this PR.

We recommend that you space out your commits to avoid hitting the rate limit.

🚦 How do rate limits work?

CodeRabbit enforces hourly rate limits for each developer per organization.

Our paid plans have higher rate limits than the trial, open-source and free plans. In all cases, we re-allow further reviews after a brief timeout.

Please see our FAQ for further information.

📥 Commits

Reviewing files that changed from the base of the PR and between ad2075f and 0c364bb.

📒 Files selected for processing (2)
  • explanations/89/en.md (1 hunks)
  • solutions/89/01.py (1 hunks)
✨ Finishing Touches
  • 📝 Generate Docstrings
🧪 Generate unit tests
  • Create PR with unit tests
  • Post copyable unit tests in a comment
  • Commit unit tests in branch pr-problem-89

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share
🪧 Tips

Chat

There are 3 ways to chat with CodeRabbit:

  • Review comments: Directly reply to a review comment made by CodeRabbit. Example:
    • I pushed a fix in commit <commit_id>, please review it.
    • Open a follow-up GitHub issue for this discussion.
  • Files and specific lines of code (under the "Files changed" tab): Tag @coderabbit in a new review comment at the desired location with your query.
  • PR comments: Tag @coderabbit in a new PR comment to ask questions about the PR branch. For the best results, please provide a very specific query, as very limited context is provided in this mode. Examples:
    • @coderabbit gather interesting stats about this repository and render them as a table. Additionally, render a pie chart showing the language distribution in the codebase.
    • @coderabbit read the files in the src/scheduler package and generate a class diagram using mermaid and a README in the markdown format.

Support

Need help? Create a ticket on our support page for assistance with any issues or questions.

CodeRabbit Commands (Invoked using PR/Issue comments)

Type @coderabbit help to get the list of available commands.

Other keywords and placeholders

  • Add @coderabbit ignore or @coderabbitai ignore anywhere in the PR description to prevent this PR from being reviewed.
  • Add @coderabbit summary or @coderabbitai summary to generate the high-level summary at a specific location in the PR description.
  • Add @coderabbit or @coderabbitai anywhere in the PR title to generate the title automatically.

CodeRabbit Configuration File (.coderabbit.yaml)

  • You can programmatically configure CodeRabbit by adding a .coderabbit.yaml file to the root of your repository.
  • Please see the configuration documentation for more information.
  • If your editor has YAML language server enabled, you can add the path at the top of this file to enable auto-completion and validation: # yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json

Status, Documentation and Community

  • Visit our Status Page to check the current availability of CodeRabbit.
  • Visit our Documentation for detailed information on how to use CodeRabbit.
  • Join our Discord Community to get help, request features, and share feedback.
  • Follow us on X/Twitter for updates and announcements.

Copy link
Contributor

sourcery-ai bot commented Aug 28, 2025

Reviewer's Guide

Introduces a detailed Markdown explanation for LeetCode problem 89 (Gray Code) and provides a clean Python implementation using the reflection method; code blocks now use tex fences for consistency.

Class diagram for the Python Gray Code solution

classDiagram
class grayCode {
    +grayCode(n)
    "Generate an n-bit Gray code sequence using reflection method"
}
Loading

File-Level Changes

Change Details Files
Add comprehensive Markdown explanation for LeetCode 89 Gray Code
  • Include problem description, examples and constraints using tex code fences
  • Document edge cases and problem restatement
  • Outline strategy with decomposition and step-by-step walkthrough
  • Analyze time and space complexity
explanations/89/en.md
Implement Python solution using the reflection method
  • Handle n=0 edge case
  • Initialize base case for 1-bit sequence
  • Iteratively reflect existing list and apply bit shifts to prefix '1'
  • Return assembled Gray code list
solutions/89/01.py

Tips and commands

Interacting with Sourcery

  • Trigger a new review: Comment @sourcery-ai review on the pull request.
  • Continue discussions: Reply directly to Sourcery's review comments.
  • Generate a GitHub issue from a review comment: Ask Sourcery to create an
    issue from a review comment by replying to it. You can also reply to a
    review comment with @sourcery-ai issue to create an issue from it.
  • Generate a pull request title: Write @sourcery-ai anywhere in the pull
    request title to generate a title at any time. You can also comment
    @sourcery-ai title on the pull request to (re-)generate the title at any time.
  • Generate a pull request summary: Write @sourcery-ai summary anywhere in
    the pull request body to generate a PR summary at any time exactly where you
    want it. You can also comment @sourcery-ai summary on the pull request to
    (re-)generate the summary at any time.
  • Generate reviewer's guide: Comment @sourcery-ai guide on the pull
    request to (re-)generate the reviewer's guide at any time.
  • Resolve all Sourcery comments: Comment @sourcery-ai resolve on the
    pull request to resolve all Sourcery comments. Useful if you've already
    addressed all the comments and don't want to see them anymore.
  • Dismiss all Sourcery reviews: Comment @sourcery-ai dismiss on the pull
    request to dismiss all existing Sourcery reviews. Especially useful if you
    want to start fresh with a new review - don't forget to comment
    @sourcery-ai review to trigger a new review!

Customizing Your Experience

Access your dashboard to:

  • Enable or disable review features such as the Sourcery-generated pull request
    summary, the reviewer's guide, and others.
  • Change the review language.
  • Add, remove or edit custom review instructions.
  • Adjust other review settings.

Getting Help

Copy link
Contributor

@sourcery-ai sourcery-ai bot left a comment

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Hey there - I've reviewed your changes - here's some feedback:

  • In the Python solution, consider adding a standard LeetCode Solution class wrapper and type hints (e.g. List[int]) to align with typical submission formats.
  • You could simplify Gray code generation by directly computing each entry with i ^ (i >> 1) instead of using the reflection loop for a more concise implementation.
  • The Markdown explanation is very thorough, but the "Brute force vs. optimized strategy" section feels a bit verbose—consider trimming it to focus more on the reflection method.
Prompt for AI Agents
Please address the comments from this code review:
## Overall Comments
- In the Python solution, consider adding a standard LeetCode Solution class wrapper and type hints (e.g. List[int]) to align with typical submission formats.
- You could simplify Gray code generation by directly computing each entry with `i ^ (i >> 1)` instead of using the reflection loop for a more concise implementation.
- The Markdown explanation is very thorough, but the "Brute force vs. optimized strategy" section feels a bit verbose—consider trimming it to focus more on the reflection method.

Sourcery is free for open source - if you like our reviews please consider sharing them ✨
Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.

Comment on lines +24 to +26
for j in range(size - 1, -1, -1):
# Add 2^(i-1) to create the reflected part with prefix '1'
result.append(result[j] + (1 << (i - 1)))
Copy link
Contributor

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

issue (code-quality): Replace a for append loop with list extend (for-append-to-extend)

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Labels

None yet

Projects

None yet

Development

Successfully merging this pull request may close these issues.

1 participant