🧠 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: 79+
• Notes Written: 1+ (expanding soon)
• Categories Covered: Arrays, Hash Maps, Dynamic Programming, Two Pointers, Binary Search, Trees, etc.

🗂 Directory Structure

• src/exercises/: Auto-downloaded solutions via leetcode.nvim caching

🧩 Problem Index

#	LeetCode #	Title	Difficulty	Technology	Notes
1	001	Two Sum	Easy	Python	📝
2	002	Add Two Numbers	Medium	Python	📝
3	003	Longest Substring Without Repeating Characters	Medium	Python	📝
4	004	Median of Two Sorted Arrays	Hard	Python	📝
5	005	Longest Palindromic Substring	Medium	Python	📝
6	009	Palindrome Number	Easy	Python	📝
7	011	Container With Most Water	Medium	Python	📝
8	013	Roman to Integer	Easy	Python	📝
9	014	Longest Common Prefix	Easy	Python	📝
10	015	3Sum	Medium	Python	📝
11	020	Valid Parentheses	Easy	Python	📝
12	022	Generate Parentheses	Medium	Python	📝
13	026	Remove Duplicates from Sorted Array	Easy	Python	📝
14	027	Remove Element	Easy	Python	📝
15	028	Find the Index of the First Occurrence in a String	Easy	Python	📝
16	035	Search Insert Position	Easy	Python	📝
17	036	Valid Sudoku	Medium	Python	📝
18	042	Trapping Rain Water	Hard	Python	📝
19	049	Group Anagrams	Medium	JavaScript	📝
20	050	Pow(x, n)	Medium	Python	📝
21	055	Jump Game	Medium	Python	📝
22	058	Length of Last Word	Easy	Python	📝
23	066	Plus One	Easy	Python	📝
24	069	Sqrt(x)	Easy	Python	📝
25	070	Climbing Stairs	Easy	JavaScript	📝
26	074	Search a 2D Matrix	Medium	Python	📝
27	080	Remove Duplicates from Sorted Array II	Medium	Python	📝
28	088	Merge Sorted Array	Easy	Python	📝
29	089	Gray Code	Medium	Python	📝
30	090	Subsets II	Medium	Python	📝
31	091	Decode Ways	Medium	Python	📝
32	104	Maximum Depth of Binary Tree	Easy	Python	📝
33	121	Best Time to Buy and Sell Stock	Easy	Python	📝
34	122	Best Time to Buy and Sell Stock II	Medium	Python	📝
35	125	Valid Palindrome	Easy	Python	📝
36	128	Longest Consecutive Sequence	Medium	Python	📝
37	135	Candy	Hard	Python	📝
38	141	Linked List Cycle	Easy	Python	📝
39	149	Max Points on a Line	Hard	Python	📝
40	151	Reverse Words in a String	Medium	Python	📝
41	153	Find Minimum in Rotated Sorted Array	Medium	Python	📝
42	155	Min Stack	Medium	Python	📝
43	167	Two Sum II - Input Array Is Sorted	Medium	Python	📝
44	169	Majority Element	Easy	Python	📝
45	172	Factorial Trailing Zeroes	Medium	Python	📝
46	189	Rotate Array	Medium	Python	📝
47	202	Happy Number	Easy	Python	📝
48	205	Isomorphic Strings	Easy	Python	📝
49	206	Reverse Linked List	Easy	Python	📝
50	217	Contains Duplicate	Easy	Python	📝
51	219	Contains Duplicate II	Easy	Python	📝
52	228	Summary Ranges	Easy	Python	📝
53	238	Product of Array Except Self	Medium	Python	📝
54	242	Valid Anagram	Easy	Python	📝
55	243	Shortest Word Distance	Easy	Python	📝
56	244	Shortest Word Distance II	Medium	Python	📝
57	245	Shortest Word Distance III	Medium	Python	📝
58	246	Strobogrammatic Number	Easy	Python	📝
59	248	Strobogrammatic Number III	Hard	Python	📝
60	271	Encode and Decode Strings	Medium	JavaScript	📝
61	274	H-Index	Medium	Python	📝
62	290	Word Pattern	Easy	Python	📝
63	347	Top K Frequent Elements	Medium	JavaScript	📝
64	383	Ransom Note	Easy	Python	📝
65	392	Is Subsequence	Easy	Python	📝
66	595	Big Countries	Easy	SQL	📝
67	704	Binary Search	Easy	Python	📝
68	760	Find Anagram Mappings	Easy	Python	📝
69	875	Koko Eating Bananas	Medium	Python	📝
70	1048	Longest String Chain	Medium	JavaScript	📝
71	1200	Minimum Absolute Difference	Easy	Python	📝
72	1302	Deepest Leaves Sum	Medium	Python	📝
73	2016	Maximum Difference Between Increasing Elements	Easy	Python	📝
74	2053	Kth Distinct String in an Array	Easy	Python	📝
75	2116	Check if a Parentheses String Can Be Valid	Medium	Python	📝
76	2294	Partition Array Such That Maximum Difference Is K	Medium	Python	📝
77	3442	Maximum Difference Between Even and Odd Frequency I	Easy	Python	📝
78	3582	Generate Tag for Video Caption	Easy	Python	📝
79	3583	Count Special Triplets	Easy	Python	📝

🛠️ 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.