leetcode-lab

Personal LeetCode solutions with a built-in TypeScript debugger and automated task scaffolding.

Structure

solutions/
├── Array/   # 15 problems
├── Math/   # 2 problems
├── Tree/   # 1 problems
├── Two Pointers/   # 5 problems
└── Untagged/   # 19 problems

Files are named as NNNN-problem-name.ts and grouped by topic.

Debugging

Two launch configurations in .vscode/launch.json:

Configuration	What it does
Debug TSX: Current File	Runs current .ts file with --inspect-brk, stops at breakpoints (F5)
Run TSX: Current File (no debug)	Runs current .ts file immediately (Ctrl+F5)

Open any .ts file, set a breakpoint with F9, press F5.

Adding a New Task

From a LeetCode link

Use the leetcode-skeleton.md skill — send a LeetCode URL and it generates a TypeScript skeleton with the problem statement, signature, and examples ready to solve.

Manually

1. Create solutions/<Topic>/NNNN-problem-name.ts with the task number prefix
2. Run the classification script to organize it by topic

Classification Script

scripts/reclassify.py classifies problems by topic using LeetCode GraphQL API:

# Classify by topic (moves files into topic subdirectories)
python3 scripts/reclassify.py

# For a specific directory
python3 scripts/reclassify.py --dir solutions/custom

Tasks

Total: 42 problems

Array (15 files)

#	Title	Difficulty
150	Evaluate Reverse Polish Notation	Medium
268	Missing Number	Easy
283	Move Zeroes	Easy
448	Find All Numbers Disappeared in an Array	Easy
485	Max Consecutive Ones	Easy
605	Can Place Flowers	Easy
636	Exclusive Time of Functions	Medium
645	Set Mismatch	Easy
739	Daily Temperatures	Medium
977	Squares of a Sorted Array	Easy
1365	How Many Numbers Are Smaller Than the Current Number	Easy
1431	Kids With the Greatest Number of Candies	Easy
1441	Build an Array With Stack Operations	Medium
1470	Shuffle the Array	Easy
1475	Final Prices With a Special Discount in a Shop	Easy

Math (2 files)

#	Title	Difficulty
67	Add Binary	Easy
1071	Greatest Common Divisor of Strings	Easy

Tree (1 files)

#	Title	Difficulty
104	Maximum Depth of Binary Tree	Easy

Two Pointers (5 files)

#	Title	Difficulty
125	Valid Palindrome	Easy
151	Reverse Words in a String	Medium
345	Reverse Vowels of a String	Easy
844	Backspace String Compare	Easy
1768	Merge Strings Alternately	Easy

Untagged (19 files)

#	Title	Difficulty
2620	Counter	Easy
2622	Cache With Time Limit	Medium
2623	Memoize	Medium
2626	Array Reduce Transformation	Easy
2627	Debounce	Medium
2629	Function Composition	Easy
2631	Group By	Medium
2637	Promise Time Limit	Medium
2665	Counter II	Easy
2666	Allow One Function Call	Easy
2677	Chunk Array	Easy
2693	Call Function with Custom Context	Medium
2703	Return Length of Arguments Passed	Easy
2715	Timeout Cancellation	Easy
2721	Execute Asynchronous Functions in Parallel	Medium
2723	Add Two Promises	Easy
2724	Sort By	Easy
2725	Interval Cancellation	Easy
2726	Calculator with Method Chaining	Easy

Customization

Other languages

The skeleton skill (leetcode-skeleton.md) targets TypeScript by default. To adapt for another language:

1. Edit the ## TypeScript Style section in leetcode-skeleton.md
2. Replace function/class signatures with the target language's LeetCode starter code
3. Update launch.json for the language's debugger