🧠 LeetCode Practice by CarGDev

This repo tracks my journey solving LeetCode problems — not just code, but my thought process, reflections, and patterns I'm mastering.

✅ Progress

• Total Problems Solved: 75+
• Notes Written: 1+ (expanding soon)
• Categories Covered: Arrays, Hash Maps, Dynamic Programming, Two Pointers, Binary Search, etc.

🗂 Directory Structure

• src/exercises/: Auto-downloaded solutions via Cursor
• src/notes/: My personal notes, approaches, and learning reflections

🧩 Problem Index

#	Title	Difficulty	Notes
001	Two Sum	Easy	View Notes
002	Add Two Numbers	Medium	View Notes
003	Longest Substring Without Repeating Characters	Medium	View Notes
004	Median of Two Sorted Arrays	Hard	View Notes
005	Longest Palindromic Substring	Medium	View Notes
006	Zigzag Conversion	Medium	View Notes
007	Reverse Integer	Medium	View Notes
009	Palindrome Number	Easy	View Notes
010	Regular Expression Matching	Hard	View Notes
011	Container With Most Water	Medium	View Notes
013	Roman to Integer	Easy	View Notes
014	Longest Common Prefix	Easy	View Notes
015	3Sum	Medium	View Notes
020	Valid Parentheses	Easy	View Notes
021	Merge Two Sorted Lists	Easy	View Notes
022	Generate Parentheses	Medium	View Notes
028	Find the Index of the First Occurrence in a String	Easy	View Notes
035	Search Insert Position	Easy	View Notes
036	Valid Sudoku	Medium	View Notes
042	Trapping Rain Water	Hard	View Notes
045	Jump Game II	Medium	View Notes
050	Pow(x, n)	Medium	View Notes
055	Jump Game	Medium	View Notes
066	Plus One	Easy	View Notes
069	Sqrt(x)	Easy	View Notes
074	Search a 2D Matrix	Medium	View Notes
080	Remove Duplicates from Sorted Array II	Medium	View Notes
088	Merge Sorted Array	Easy	View Notes
089	Gray Code	Medium	View Notes
090	Subsets II	Medium	View Notes
091	Decode Ways	Medium	View Notes
092	Reverse Linked List II	Medium	View Notes
121	Best Time to Buy and Sell Stock	Easy	View Notes
122	Best Time to Buy and Sell Stock II	Medium	View Notes
125	Valid Palindrome	Easy	View Notes
128	Longest Consecutive Sequence	Medium	View Notes
135	Candy	Hard	View Notes
141	Linked List Cycle	Easy	View Notes
149	Max Points on a Line	Hard	View Notes
150	Evaluate Reverse Polish Notation	Medium	View Notes
153	Find Minimum in Rotated Sorted Array	Medium	View Notes
155	Min Stack	Medium	View Notes
167	Two Sum II - Input Array Is Sorted	Medium	View Notes
169	Majority Element	Easy	View Notes
172	Factorial Trailing Zeroes	Medium	View Notes
189	Rotate Array	Medium	View Notes
202	Happy Number	Easy	View Notes
205	Isomorphic Strings	Easy	View Notes
206	Reverse Linked List	Easy	View Notes
217	Contains Duplicate	Easy	View Notes
219	Contains Duplicate II	Easy	View Notes
228	Summary Ranges	Easy	View Notes
238	Product of Array Except Self	Medium	View Notes
242	Valid Anagram	Easy	View Notes
243	Shortest Word Distance	Easy	View Notes
244	Shortest Word Distance II	Medium	View Notes
245	Shortest Word Distance III	Medium	View Notes
246	Strobogrammatic Number	Easy	View Notes
248	Strobogrammatic Number III	Hard	View Notes
290	Word Pattern	Easy	View Notes
383	Ransom Note	Easy	View Notes
392	Is Subsequence	Easy	View Notes
704	Binary Search	Easy	View Notes
875	Koko Eating Bananas	Medium	View Notes
990	Satisfiability of Equality Equations	Medium	View Notes
1200	Minimum Absolute Difference	Easy	View Notes
1298	Maximum Candies You Can Get from Boxes	Medium	View Notes
1820	Maximum Number of Accepted Invitations	Medium	View Notes
2040	Kth Smallest Product of Two Sorted Arrays	Medium	View Notes
2053	Kth Distinct String in an Array	Easy	View Notes
2116	Check if a Parentheses String Can Be Valid	Medium	View Notes
2294	Partition Array Such That Maximum Difference Is K	Medium	View Notes
2441	Largest Positive Integer That Exists With Its Negative	Easy	View Notes
2616	Minimize the Maximum Difference of Pairs	Medium	View Notes
2966	Divide Array Into Arrays With Max Difference	Medium	View Notes
3442	Maximum Difference Between Even and Odd Frequency I	Easy	View Notes
3445	Maximum Difference Between Even and Odd Frequency II	Easy	View Notes

🛠️ Tools & Scripts

• create_missing_notes.sh: Automatically creates missing note files for solved problems
• update_difficulties.sh: Manage problem difficulties dynamically without hardcoding

Script Usage Examples:

# Create missing notes for new problems
./create_missing_notes.sh

# Add difficulty mapping for a problem
./update_difficulties.sh -a 1 Easy
./update_difficulties.sh -a 4 Hard

# List all difficulty mappings
./update_difficulties.sh -l

# Update all note files with correct difficulties
./update_difficulties.sh -u

# Remove difficulty mapping
./update_difficulties.sh -r 1

📚 Resources

• LeetCode Problem Set
• My LeetCode Profile

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This repository is a living document of my algorithmic learning journey. Each note captures my thought process, mistakes, and insights.