leetcode/README.md

🧠 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

🧩 Problem Index

#	LeetCode #	Title	Difficulty	Technology
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
8	011	Container With Most Water	Medium	Python
9	013	Roman to Integer	Easy	Python
10	014	Longest Common Prefix	Easy	Python
11	015	3Sum	Medium	Python
12	020	Valid Parentheses	Easy	Python
14	022	Generate Parentheses	Medium	Python
15	026	Remove Duplicates from Sorted Array	Easy	Python
16	027	Remove Element	Easy	Python
17	028	Find the Index of the First Occurrence in a String	Easy	Python
18	035	Search Insert Position	Easy	Python
19	036	Valid Sudoku	Medium	Python
20	042	Trapping Rain Water	Hard	Python
22	049	Group Anagrams	Medium	JavaScript
23	050	Pow(x, n)	Medium	Python
24	055	Jump Game	Medium	Python
24	595	Big Countries	Easy	SQL
25	058	Length of Last Word	Easy	Python
26	066	Plus One	Easy	Python
27	069	Sqrt(x)	Easy	Python
28	070	Climbing Stairs	Easy	JavaScript
29	074	Search a 2D Matrix	Medium	Python
30	080	Remove Duplicates from Sorted Array II	Medium	Python
31	088	Merge Sorted Array	Easy	Python
32	089	Gray Code	Medium	Python
33	090	Subsets II	Medium	Python
34	091	Decode Ways	Medium	Python
36	121	Best Time to Buy and Sell Stock	Easy	Python
37	122	Best Time to Buy and Sell Stock II	Medium	Python
38	125	Valid Palindrome	Easy	Python
39	128	Longest Consecutive Sequence	Medium	Python
40	1302	Deepest Leaves Sum	Medium	Python
41	135	Candy	Hard	Python
42	141	Linked List Cycle	Easy	Python
43	149	Max Points on a Line	Hard	Python
45	151	Reverse Words in a String	Medium	Python
46	153	Find Minimum in Rotated Sorted Array	Medium	Python
47	155	Min Stack	Medium	Python
48	167	Two Sum II - Input Array Is Sorted	Medium	Python
49	169	Majority Element	Easy	Python
50	172	Factorial Trailing Zeroes	Medium	Python
51	189	Rotate Array	Medium	Python
52	202	Happy Number	Easy	Python
53	205	Isomorphic Strings	Easy	Python
54	2053	Kth Distinct String in an Array	Easy	Python
55	206	Reverse Linked List	Easy	Python
56	217	Contains Duplicate	Easy	Python
57	219	Contains Duplicate II	Easy	Python
58	228	Summary Ranges	Easy	Python
59	238	Product of Array Except Self	Medium	Python
60	242	Valid Anagram	Easy	Python
61	243	Shortest Word Distance	Easy	Python
62	244	Shortest Word Distance II	Medium	Python
63	245	Shortest Word Distance III	Medium	Python
64	246	Strobogrammatic Number	Easy	Python
65	248	Strobogrammatic Number III	Hard	Python
66	271	Encode and Decode Strings	Medium	JavaScript
67	290	Word Pattern	Easy	Python
69	347	Top K Frequent Elements	Medium	JavaScript
70	383	Ransom Note	Easy	Python
71	392	Is Subsequence	Easy	Python
72	704	Binary Search	Easy	Python
73	760	Find Anagram Mappings	Easy	Python
74	875	Koko Eating Bananas	Medium	Python
76	1048	Longest String Chain	Medium	JavaScript
77	1200	Minimum Absolute Difference	Easy	Python
80	2016	Maximum Difference Between Increasing Elements	Easy	Python
83	2294	Partition Array Such That Maximum Difference Is K	Medium	Python
85	3442	Maximum Difference Between Even and Odd Frequency I	Easy	Python
87	3582	Generate Tag for Video Caption	Easy	Python
88	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.