Premium LeetCode practice environment with modern Python tooling, beautiful tree visualizations, and comprehensive testing.

• Template-driven development - Consistent structure for every problem
• Beautiful visualizations - TreeNode with anytree/Graphviz, ListNode with arrows
• Interactive notebooks - Multi-cell playground for each problem
• One-command testing - make p-test PROBLEM=problem_name
• Bulk regeneration - make gen-all-problems from JSON templates
• Full linting - black, isort, ruff, mypy with nbqa for notebooks
• Modern Python - PEP 585/604 syntax with full type hints

# Run existing problems
make p-test PROBLEM=insert_interval
make p-test PROBLEM=invert_binary_tree

# Run all tests
make test

Adding new problems:

• Copy problem and placeholder solution from LeetCode
• Ask LLM to generate them
• LLM follows workflow in .amazonq/rules/problem-creation.md using cookiecutter templates

make p-test PROBLEM=insert_interval     # Test specific problem
make test                               # Run all tests
make lint                               # Code quality checks
make p-gen PROBLEM=new_prob             # Generate new problem

🍴 Fork Setup:

make gen-all-problems                   # Regenerate all problems from JSON templates

• TreeNode: from leetcode_py.tree_node import TreeNode
  • Beautiful tree visualization with anytree rendering
  • Jupyter notebook support with Graphviz diagrams
  • Easy array ↔ tree conversion for testing
• ListNode: from leetcode_py.list_node import ListNode
  • Clean arrow visualization (1 -> 2 -> 3)
  • Simple array ↔ list conversion
  • Perfect for debugging linked list problems
• New helpers: Add to leetcode_py/

Perfect for interview preparation with professional-grade tooling and beautiful visualizations.