LeetCode Solutions 🚀

This repository contains my solutions to various LeetCode problems. My primary goal here is to master data structures and algorithms while applying professional software engineering practices, such as unit testing and benchmarking.

Roadmap & Progress

#	Problem	Category	Difficulty	Go	C	Python	Notes
0001	Two Sum	Arrays & Hashing	🟢 Easy	✅	❌	✅	-
0002	Add Two Numbers	Linked List	🟡 Medium	✅	❌	❌	-
0003	Longest Substring	Sliding Window	🟡 Medium	✅	❌	❌	View Doc 📖
0004	Median of Two Sorted Arrays	Binary Search	🔴 Hard	✅	❌	❌	-
0007	Reverse Integer	Math	🟡 Medium	✅	❌	❌	-
0008	String to Integer (atoi)	Strings	🟡 Medium	✅	❌	❌	-
0009	Palindrome Number	Math	🟢 Easy	✅	✅	❌	-
0012	Integer to Roman	Math	🟡 Medium	✅	❌	❌	-
0013	Roman to Integer	Arrays & Hashing	🟢 Easy	✅	❌	❌	-
0014	Longest Common Prefix	Strings	🟢 Easy	✅	❌	❌	-
0015	3Sum	Arrays & Hashing	🟡 Medium	✅	❌	❌	-
0020	Valid Parentheses	Stack	🟢 Easy	✅	❌	❌	-
0021	Merge Two Sorted Lists	Linked List	🟢 Easy	✅	✅	❌	-
0022	Generate Parentheses	Backtracking	🟡 Medium	✅	❌	❌	-
0026	Remove Duplicates from Sorted Array	Arrays & Hashing	🟢 Easy	✅	❌	❌	-
0027	Remove Elements	Arrays & Hashing	🟢 Easy	✅	❌	❌	-
0035	Search Insert Position	Binary Search	🟢 Easy	✅	❌	❌	-
0094	Binary Tree Inorder Traversal	Trees	🟢 Easy	✅	❌	❌	-
0101	Symmetric Tree	Trees	🟢 Easy	✅	❌	❌	-
0133	Clone Graph	Graphs	🟡 Medium	✅	❌	❌	-
0144	Binary Tree Preorder Traversal	Trees	🟢 Easy	✅	❌	❌	-
0145	Binary Tree Postorder Traversal	Trees	🟢 Easy	✅	❌	❌	-
0226	Invert Binary Tree	Trees	🟢 Easy	✅	✅	❌	View Doc 📖
0997	Find the Town Judge	Graphs	🟢 Easy	✅	❌	❌	-
1081	Smallest Subsequence of Distinct Characters	Stack	🟡 Medium	✅	❌	❌	String
1114	Print in Order	Concurrency	🟢 Easy	✅	❌	❌	-
1115	Print FooBar Alternately	Concurrency	🟡 Medium	✅	❌	❌	-
1288	Remove Covered Intervals	Arrays & Hashing	🟡 Medium	✅	❌	❌	Sorting with custom comparator
1291	Sequential Digits	Math	🟡 Medium	✅	❌	❌	-
1301	Number of Paths with Max Score	Dynamic Programming	🔴 Hard	✅	❌	❌	DP on Grids
1331	Rank Transform of an Array	Arrays & Hashing	🟢 Easy	✅	❌	❌	-
2144	Minimum Cost of Buying Candies With Discount	Greedy	🟢 Easy	✅	❌	❌	-
2492	Minimum Score of a Path Between Two Cities	Graphs	🟡 Medium	✅	❌	❌	DFS / Connected Components
2812	Find the Safest Path in a Grid	Arrays & Hashing	🟡 Medium	✅	❌	❌	Multi-source BFS + Binary Search
3286	Find a Safe Walk Through a Grid	Graphs	🟡 Medium	✅	❌	❌	Dijkstra / 0-1 BFS
3513	Number of Unique XOR Triplets I	Math	🟡 Medium	✅	❌	❌	Bitwise Operations
3532	Path Existence Queries in a Graph I	Graphs	🟡 Medium	✅	❌	❌	Connected components grouping
3754	Concatenate Non-Zero Digits and Multiply by Sum I	Math	🟢 Easy	✅	❌	❌	-
3756	Concatenate Non-Zero Digits and Multiply by Sum II	Math	🟡 Medium	✅	❌	❌	Prefix Sum & Binary Search
3867	Sum of GCD of Formed Pairs	Math	🟡 Medium	✅	❌	❌	-

(Legend: ✅ Completed | 🏗️ In Progress | ❌ Not started)