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Leetgo

leetgo is a command-line tool for LeetCode that provides almost all the functionality of LeetCode, allowing you to do all of your LeetCode exercises without leaving the terminal. It can automatically generate skeleton code and test cases, support local testing and debugging, and you can use any IDE you like to solve problems.

And leetgo also supports real-time generation of contest questions, submitting all questions at once, so your submissions are always one step ahead!

Quick Start

1. Install leetgo
2. Initialize leetgo: leetgo init -t <us or cn> -l <lang>
3. Edit leetgo config file: leetgo.yaml
4. Pick a question: leetgo pick <id or name or today>
5. Test your code: leetgo test last -L
6. Submit your code: leetgo submit last

You can test and submit in one command: leetgo test last -L -s

You can edit the question file in your favorite editor: leetgo edit last

Demo

Features

• Generate description, skeleton code and testing code for a question
• Customize the code template for generated code, use modifiers to pre-process code
• Execute test cases on your local machine
• Wait and generate contest questions just in time, test and submit all at once
• Support for both leetcode.com and leetcode.cn
• Automatically read cookies from browser, no need to enter password
• Automatically open question files in your favourite editor
• Use OpenAI to automatically discover and fix issues in the code (Experimental)

Language support

leetgo supports code generation for most languages, and local testing for some languages.

In the Go language, running leetgo pick 257 will generate the following code:

// Omitted some code...
// @lc code=begin

func binaryTreePaths(root *TreeNode) (ans []string) {

	return
}

// @lc code=end

func main() {
	stdin := bufio.NewReader(os.Stdin)
	root := Deserialize[*TreeNode](ReadLine(stdin))
	ans := binaryTreePaths(root)
	fmt.Println("output: " + Serialize(ans))
}

This is a complete and runnable program. You can run it directly, input the test cases, and compare the results. leetgo test -L will automatically run this program with the test cases in testcases.txt and compare the results.

Local testing means that you can run the test cases on your local machine, so you can use a debugger to debug your code.

Local testing requires more work to implement for each language, so not all languages are supported. Below is the current support matrix:

Welcome to help us implement local testing for more languages!

Installation

You can download the latest binary from the release page.

Install via HomeBrew on macOS/Linux

brew install j178/tap/leetgo

Install via Scoop on Windows

scoop bucket add j178 https://github.com/j178/scoop-bucket.git
scoop install j178/leetgo

Install on ArchLinux

yay -S leetgo-bin

Install via installer script on macOS/Linux

curl -fsSL https://raw.githubusercontent.com/j178/leetgo/master/scripts/install.sh | bash

Install from source via go install

go install github.com/j178/leetgo@latest

Usage

Usage:
  leetgo [command]

Available Commands:
  init                    Init a leetcode workspace
  pick                    Generate a new question
  info                    Show question info
  test                    Run question test cases
  submit                  Submit solution
  fix                     Use ChatGPT API to fix your solution code (just for fun)
  edit                    Open solution in editor
  contest                 Generate contest questions
  cache                   Manage local questions cache
  debug                   Show debug info
  open                    Open one or multiple question pages in a browser
  help                    Help about any command

Flags:
  -v, --version       version for leetgo
  -l, --lang string   language of code to generate: cpp, go, python ...
      --site string   leetcode site: cn, us
  -y, --yes           answer yes to all prompts
  -h, --help          help for leetgo

Use "leetgo [command] --help" for more information about a command.

Question Identifier

Many leetgo commands rely on qid to find the leetcode question. qid is a simplified question identifier defined by leetgo, which includes the following forms (using the two-sum problem as an example):

leetgo pick two-sum          # `two-sum` is the question slug
leetgo pick 1                # `1` is the question id
leetgo pick today            # `today` means daily question
leetgo pick yesterday        # `yesterday` means the question of yesterday
leetgo pick today-1          # `today-1` means the question of yesterday, same as `yesterday`. `today-2`, `today-3` etc are also supported.
leetgo contest weekly100     # `weekly100` means the 100th weekly contest
leetgo test last             # `last` means the last generated question
leetgo test weekly100/1      # `weekly100/1` means the first question of the 100th weekly contest
leetgo submit b100/2         # `b100/2` means the second question of the 100th biweekly contest
leetgo submit w99/           # `w99/` means all questions of the 99th biweekly contest (must keep the trailing slash)
leetgo test last/1           # `last/1` means the first question of the last generated contest
leetgo test last/            # `last/` means all questions of the last generated contest (must keep the trailing slash)

Configuration

[!WARNING] Since v1.4, leetgo no longer reads the global ~/.config/leetgo/config.yaml file, please put all configurations in the project's leetgo.yaml file.

leetgo init generates a leetgo.yaml file in the current directory, which contains all the configurations of leetgo. You can modify this file according to your needs.

The directory where leetgo.yaml is located is considered as the root directory of a leetgo project, and leetgo will generate all code files undeer this directory. leetgo will look for the leetgo.yaml file in the current directory. If it is not found, it will recursively search upwards until a leetgo.yaml file is found or the root directory of the file system is reached.

Below is the demonstration of a complete configuration:

# Your name
author: Bob
# Language of the question description: 'zh' (Simplified Chinese) or 'en' (English).
language: zh
code:
  # Language of code generated for questions: go, cpp, python, java... 
  # (will be overridden by command line flag -l/--lang).
  lang: go
  # The default template to generate filename (without extension), e.g. {{.Id}}.{{.Slug}}
  # Available attributes: Id, Slug, Title, Difficulty, Lang, SlugIsMeaningful
  # (Most questions have descriptive slugs, but some consist of random characters. The SlugIsMeaningful boolean indicates whether a slug is meaningful.)
  # Available functions: lower, upper, trim, padWithZero, toUnderscore, group.
  filename_template: '{{ .Id | padWithZero 4 }}{{ if .SlugIsMeaningful }}.{{ .Slug }}{{ end }}'
  # Generate question description into a separate question.md file, otherwise it will be embed in the code file.
  separate_description_file: true
  # Default modifiers for all languages.
  modifiers:
    - name: removeUselessComments
  go:
    # Base directory to put generated questions, defaults to the language slug, e.g. go, python, cpp.
    out_dir: go
    # Functions that modify the generated code.
    modifiers:
      - name: removeUselessComments
      - name: changeReceiverName
      - name: addNamedReturn
      - name: addMod
  python3:
    # Base directory to put generated questions, defaults to the language slug, e.g. go, python, cpp.
    out_dir: python
    # Path to the python executable that creates the venv.
    executable: python3
  cpp:
    # Base directory to put generated questions, defaults to the language slug, e.g. go, python, cpp.
    out_dir: cpp
    # C++ compiler
    cxx: g++
    # C++ compiler flags (our Leetcode I/O library implementation requires C++17).
    cxxflags: -O2 -std=c++17
  rust:
    # Base directory to put generated questions, defaults to the language slug, e.g. go, python, cpp.
    out_dir: rust
  java:
    # Base directory to put generated questions, defaults to the language slug, e.g. go, python, cpp.
    out_dir: java
leetcode:
  # LeetCode site, https://leetcode.com or https://leetcode.cn
  site: https://leetcode.cn
  # Credentials to access LeetCode.
  credentials:
    # How to provide credentials: browser, cookies, password or none.
    from: browser
    # Browsers to get cookies from: chrome, safari, edge or firefox. If empty, all browsers will be tried. Only used when 'from' is 'browser'.
    browsers: []
contest:
  # Base directory to put generated contest questions.
  out_dir: contest
  # Template to generate filename of the question.
  filename_template: '{{ .ContestShortSlug }}/{{ .Id }}{{ if .SlugIsMeaningful }}.{{ .Slug }}{{ end }}'
  # Open the contest page in browser after generating.
  open_in_browser: true
# Editor settings to open generated files.
editor:
  # Use a predefined editor: vim, vscode, goland
  # Set to 'none' to disable, set to 'custom' to provide your own command and args.
  use: none
  # Custom command to open files.
  command: ""
  # Arguments to your custom command.
  # String contains {{.CodeFile}}, {{.TestFile}}, {{.DescriptionFile}}, {{.TestCasesFile}} will be replaced with corresponding file path.
  # {{.Folder}} will be substituted with the output directory.
  # {{.Files}} will be substituted with the list of all file paths.
  args: ""

LeetCode Credentials

leetgo uses LeetCode's GraphQL API to retrieve questions and submit solutions. leetgo needs your LeetCode cookies to access the authenticated API.

There are three ways to make cookies available to leetgo:

• Read cookies from browser automatically.

  Currently, leetgo supports Chrome, FireFox, Safari[^1], Edge.

  leetcode:
    credentials:
      from: browser
  

• Provide cookies.

  You can get your cookies named LEETCODE_SESSION and csrftoken from browser's developer tools, and set the LEETCODE_SESSION and LEETCODE_CSRFTOKEN environment variables. If you are using leetcode.com, LEETCODE_CFCLEARANCE should also be set to the value of the cf_clearance cookie.

  leetcode:
    credentials:
      from: cookies
  

• Provide username and password through LEETCODE_USERNAME and LEETCODE_PASSWORD environment variables.

  leetcode:
    credentials:
      from: password
  

[!NOTE] Password authentication is not recommended, and it is not supported by leetcode.com.

You can put environment variables in a .env file in the project's root directory, and leetgo will automatically read them.

Advanced Usage

testcases.txt

testcasts.txt is generated by leetgo and contains all the test cases of the question.

You can add a new test case by specifying only the input and leaving the output blank. When you run leetgo test (without -L), the expected output will be retrieved from the remote server. For example:

input:
[3,3]
6
output:

input:
[1,2,3,4]
7
output:

Templates

Several fields in leetgo's config file support templating. These fields are often suffixed with _template. You can use custom template to generate your own filename, code, etc.

Blocks

A code file is composed of different blocks, you can overwrite some of them to provide your own snippets.

For example:

code:
lang: cpp
cpp:
  blocks:
  - name: beforeCode
    template: |
      #include <iostream>
      using namespace std;
  - name: afterMarker
    template: |
      int main() {}

Scripting

leetgo supports providing a JavaScript function to handle the code before generation, for example:

code:
  lang: cpp
  cpp:
    modifiers:
    - name: removeUselessComments
    - script: |
        function modify(code) {
          return "// hello world\n" + code;
        }

FAQ

If you encounter any problems, please run your command with the DEBUG environment variable set to 1, copy the command output, and open an issue.

Some common problems can be found in the Q&A page.

Contributions welcome!

Good First Issues are a good place to start, and you can also check out some Help Wanted issues.

If you want to add local testing support for a new language, please refer to #112.

Before submitting a PR, please run golangci-lint run --fix to fix lint errors.

Credits

Here are some awesome projects that inspired me to create this project:

• https://github.com/EndlessCheng/codeforces-go
• https://github.com/clearloop/leetcode-cli
• https://github.com/budougumi0617/leetgode
• https://github.com/skygragon/leetcode-cli

Also thanks to JetBrains for providing free licenses to support this project.

[^1]: For Safari on macOS, you may need to grant Full Disk Access privilege to your terminal app which you would like to run leetgo.