Openleetcode: A Local LeetCode Runner with Repository-Based Tests and Runtimes

Introduction to Openleetcode

Openleetcode is a newly released local LeetCode runner developed in Haskell. It is designed to provide a self-contained environment for developers to test their LeetCode solutions. The core principle of Openleetcode is that both the test suites and runtime templates reside within the repository, offering transparency and local control over the testing process.

How it Works

The runner processes a solution file, identifies the corresponding problem manifest, and constructs a language-specific harness. This harness is then sent to a pluggable execution backend, which judges the result locally. Docker is required for the execution backend, with Piston being the default choice. The CLI acts as the interface, allowing users to submit solutions by ID or title.

Installation and Usage

Installation scripts are provided for Linux, macOS, and Windows PowerShell. Users on Linux and macOS will have the default Piston backend started automatically via Docker Compose, while Windows users need to set up Docker and start the backend manually. After installation, users can download data assets and submit solutions using commands like `openleetcode submit ./solution.py --id 1`.

Supported Languages and Features

Openleetcode includes templates for a variety of programming languages, including C++, Rust, Python3, Python2, Ruby, Java, C#, Kotlin, Go, Dart, Swift, and TypeScript. Each runtime provides a compatibility layer for common LeetCode problem requirements, such as JSON output, array handling, linked lists, and binary trees. The tool aims to keep imports and common libraries consistent with official LeetCode environments.