LeetCli

A CLI tool that generates random LeetCode problems with skeleton code in your preferred programming language.

Features

• Interactive topic selection (Arrays, Linked Lists, Graphs, Trees, Tries, DP, etc.)
• Multiple programming language support (Rust, Python, JavaScript, Java, C++, Go, TypeScript)
• AI-generated problems with proper skeleton code and test cases
• Automatic file creation in problems/ directory
• Customizable AI models for different speed/quality preferences
• Command line interface with help and options

Setup

1. Get a Gemini API key from Google AI Studio

2. Build and run:

cargo build --release
cargo run

The tool will ask for your Gemini API key on first run and save it securely in ~/.leetcli_api_key for future use.

You can also set it as an environment variable to skip the prompt entirely:

export GEMINI_API_KEY="your-api-key-here"

Usage

Basic Usage

leetcli

On first run, you'll be prompted to select a default difficulty level which will be saved for future use.

Interactive Difficulty Selection

leetcli -d

Shows a dropdown menu to select difficulty level and updates your saved preference.

Direct Difficulty Setting

leetcli --difficulty hard
leetcli -d easy

Sets difficulty directly and updates your saved preference.

Combined Options

leetcli --model gemini-1.5-pro-latest --difficulty hard
leetcli -m gemini-2.0-flash-exp -d easy

List Available Options

leetcli --list-models
leetcli --list-difficulties

Help

leetcli --help

Available Models

• gemini-2.5-flash-lite (default) - Fastest model, good for quick problem generation
• gemini-2.0-flash-exp - Experimental fast model with latest features
• gemini-1.5-flash-latest - Stable fast model, reliable performance
• gemini-1.5-pro-latest - More capable but slower, better for complex problems
• gemini-pro - Older stable model

Available Difficulty Levels

• easy - Simple problems with basic algorithms and data structures
• medium - Moderate complexity with common algorithms
• hard - Complex problems with advanced algorithms and optimization

Persistent Preferences

The tool saves your preferences locally:

• API Key: ~/.leetcli_api_key
• Difficulty: ~/.leetcli_difficulty

Preferences are automatically updated when you use command line arguments.

API Key Priority

The tool checks for your API key in this order:

1. GEMINI_API_KEY environment variable
2. Saved key file (~/.leetcli_api_key)
3. Interactive prompt (saves for future use)

Example Output

First Run

$ leetcli
>> LeetCli - Generate LeetCode Problems
[!] No difficulty preference found
? Select default difficulty level: › medium
[+] Difficulty preference saved: medium
Using model: gemini-2.5-flash-lite
Difficulty: medium
[✓] Using saved Gemini API key
? Select a topic: › Arrays
? Select programming language: › Rust
Generating Arrays problem for Rust...
[✓] Problem generated: problems/two_sum.rs

Subsequent Runs

$ leetcli
>> LeetCli - Generate LeetCode Problems
Using model: gemini-2.5-flash-lite
Difficulty: medium
[✓] Using saved Gemini API key
? Select a topic: › Dynamic Programming
? Select programming language: › Python
Generating Dynamic Programming problem for Python...
[✓] Problem generated: problems/coin_change.py

Interactive Difficulty Change

$ leetcli -d
>> LeetCli - Generate LeetCode Problems
? Select difficulty level: › hard
[+] Difficulty preference saved: hard
Using model: gemini-2.5-flash-lite
Difficulty: hard

Generated files include:

• Complete problem description with examples
• Code skeleton with proper function signatures
• Test cases to verify your implementation
• All necessary imports and boilerplate

Command Line Options

leetcli [OPTIONS]

Options:
  -m, --model <MODEL>          Gemini model to use [default: gemini-2.5-flash-lite]
  -d, --difficulty [LEVEL]     Problem difficulty level (interactive if no value)
      --list-models            Show available models
      --list-difficulties      Show available difficulty levels
  -h, --help                   Print help
  -V, --version                Print version

Examples

# Generate problem with saved preferences
leetcli

# First time setup - will ask for difficulty preference
leetcli  # Shows difficulty selection dropdown

# Interactive difficulty selection
leetcli -d  # Shows dropdown to select and save new difficulty

# Direct difficulty setting
leetcli -d easy          # Sets to easy and saves preference
leetcli --difficulty hard  # Sets to hard and saves preference

# Generate easy problem with fast model
leetcli -d easy -m gemini-2.5-flash-lite

# Generate hard problem with pro model
leetcli --difficulty hard --model gemini-1.5-pro-latest

# List all available options
leetcli --list-models
leetcli --list-difficulties