LeetCode Solutions

📌 My accepted solutions to LeetCode problems across multiple programming languages. I focus on writing efficient algorithms with optimal time and space complexity, alongside clean and readable code.

🚀 The Solutions Table below is generated automatically. A GitHub Action script scans the solution files in this repository, fetches problem details from the official LeetCode API, and updates this README every time code changes are pushed. This way, the table always reflects the latest accepted solutions — no manual updates needed!

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Solutions Table

#	Title	Solution	Difficulty
1	Two Sum	C++	🟢 Easy
2	Add Two Numbers	Python	🟡 Medium
3	Longest Substring Without Repeating Characters	Python	🟡 Medium
4	Median of Two Sorted Arrays	Python	🔴 Hard
6	Zigzag Conversion	Python	🟡 Medium
9	Palindrome Number	Python	🟢 Easy
11	Container With Most Water	Python	🟡 Medium
12	Integer to Roman	Python	🟡 Medium
13	Roman to Integer	Python	🟢 Easy
14	Longest Common Prefix	C++	🟢 Easy
15	3Sum	Python	🟡 Medium
17	Letter Combinations of a Phone Number	Python	🟡 Medium
19	Remove Nth Node From End of List	Python	🟡 Medium
20	Valid Parentheses	Python	🟢 Easy
21	Merge Two Sorted Lists	Python	🟢 Easy
22	Generate Parentheses	Python	🟡 Medium
25	Reverse Nodes in k-Group	Python	🔴 Hard
26	Remove Duplicates from Sorted Array	Python	🟢 Easy
27	Remove Element	C++	🟢 Easy
28	Find the Index of the First Occurrence in a String	Python	🟢 Easy
30	Substring with Concatenation of All Words	Python	🔴 Hard
33	Search in Rotated Sorted Array	Python	🟡 Medium
34	Find First and Last Position of Element in Sorted Array	Python	🟡 Medium
35	Search Insert Position	Python	🟢 Easy
36	Valid Sudoku	Python	🟡 Medium
39	Combination Sum	Python	🟡 Medium
42	Trapping Rain Water	Python	🔴 Hard
45	Jump Game II	Python	🟡 Medium
46	Permutations	Python	🟡 Medium
48	Rotate Image	Python	🟡 Medium
49	Group Anagrams	Python	🟡 Medium
52	N-Queens II	Python	🔴 Hard
53	Maximum Subarray	Python	🟡 Medium
54	Spiral Matrix	Python	🟡 Medium
55	Jump Game	Python	🟡 Medium
56	Merge Intervals	Python	🟡 Medium
57	Insert Interval	Python	🟡 Medium
58	Length of Last Word	Python	🟢 Easy
61	Rotate List	Python	🟡 Medium
67	Add Binary	Python	🟢 Easy
68	Text Justification	Python	🔴 Hard
69	Sqrt(x)	Python	🟢 Easy
70	Climbing Stairs	Python	🟢 Easy
71	Simplify Path	Python	🟡 Medium
73	Set Matrix Zeroes	Python	🟡 Medium
74	Search a 2D Matrix	Python	🟡 Medium
76	Minimum Window Substring	Python	🔴 Hard
77	Combinations	Python	🟡 Medium
79	Word Search	Python	🟡 Medium
80	Remove Duplicates from Sorted Array II	Python	🟡 Medium
82	Remove Duplicates from Sorted List II	Python	🟡 Medium
86	Partition List	Python	🟡 Medium
88	Merge Sorted Array	C++	🟢 Easy
92	Reverse Linked List II	Python	🟡 Medium
98	Validate Binary Search Tree	Python	🟡 Medium
100	Same Tree	Python	🟢 Easy
101	Symmetric Tree	Python	🟢 Easy
102	Binary Tree Level Order Traversal	Python	🟡 Medium
103	Binary Tree Zigzag Level Order Traversal	Python	🟡 Medium
104	Maximum Depth of Binary Tree	Python	🟢 Easy
105	Construct Binary Tree from Preorder and Inorder Traversal	Python	🟡 Medium
106	Construct Binary Tree from Inorder and Postorder Traversal	Python	🟡 Medium
108	Convert Sorted Array to Binary Search Tree	Python	🟢 Easy
112	Path Sum	Python	🟢 Easy
114	Flatten Binary Tree to Linked List	Python	🟡 Medium
117	Populating Next Right Pointers in Each Node II	Python	🟡 Medium
118	Pascal's Triangle	Python	🟢 Easy
119	Pascal's Triangle II	Python	🟢 Easy
121	Best Time to Buy and Sell Stock	Python	🟢 Easy
122	Best Time to Buy and Sell Stock II	Python	🟡 Medium
124	Binary Tree Maximum Path Sum	Python	🔴 Hard
125	Valid Palindrome	Python	🟢 Easy
127	Word Ladder	Python	🔴 Hard
128	Longest Consecutive Sequence	Python	🟡 Medium
129	Sum Root to Leaf Numbers	Python	🟡 Medium
130	Surrounded Regions	Python	🟡 Medium
133	Clone Graph	Python	🟡 Medium
134	Gas Station	Python	🟡 Medium
135	Candy	Python	🔴 Hard
136	Single Number	Python	🟢 Easy
138	Copy List with Random Pointer	Python	🟡 Medium
139	Word Break	Python	🟡 Medium
141	Linked List Cycle	Python	🟢 Easy
146	LRU Cache	Python	🟡 Medium
148	Sort List	Python	🟡 Medium
150	Evaluate Reverse Polish Notation	Python	🟡 Medium
151	Reverse Words in a String	Python	🟡 Medium
153	Find Minimum in Rotated Sorted Array	Python	🟡 Medium
155	Min Stack	Python	🟡 Medium
162	Find Peak Element	Python	🟡 Medium
167	Two Sum II - Input Array Is Sorted	Python	🟡 Medium
169	Majority Element	Python	🟢 Easy
173	Binary Search Tree Iterator	Python	🟡 Medium
189	Rotate Array	Python	🟡 Medium
190	Reverse Bits	Python	🟢 Easy
191	Number of 1 Bits	Python	🟢 Easy
198	House Robber	Python	🟡 Medium
199	Binary Tree Right Side View	Python	🟡 Medium
200	Number of Islands	Python	🟡 Medium
202	Happy Number	Python	🟢 Easy
205	Isomorphic Strings	Python	🟢 Easy
206	Reverse Linked List	Python	🟢 Easy
207	Course Schedule	Python	🟡 Medium
208	Implement Trie (Prefix Tree)	Python	🟡 Medium
209	Minimum Size Subarray Sum	Python	🟡 Medium
210	Course Schedule II	Python	🟡 Medium
211	Design Add and Search Words Data Structure	Python	🟡 Medium
215	Kth Largest Element in an Array	Python	🟡 Medium
219	Contains Duplicate II	Python	🟢 Easy
222	Count Complete Tree Nodes	Python	🟢 Easy
224	Basic Calculator	Python	🔴 Hard
226	Invert Binary Tree	Python	🟢 Easy
228	Summary Ranges	Python	🟢 Easy
230	Kth Smallest Element in a BST	Python	🟡 Medium
232	Implement Queue using Stacks	Python	🟢 Easy
236	Lowest Common Ancestor of a Binary Tree	Python	🟡 Medium
238	Product of Array Except Self	Java	🟡 Medium
242	Valid Anagram	Python	🟢 Easy
268	Missing Number	Python	🟢 Easy
274	H-Index	C++	🟡 Medium
283	Move Zeroes	Python	🟢 Easy
289	Game of Life	Python	🟡 Medium
290	Word Pattern	Python	🟢 Easy
300	Longest Increasing Subsequence	Python	🟡 Medium
322	Coin Change	Python	🟡 Medium
347	Top K Frequent Elements	Python	🟡 Medium
350	Intersection of Two Arrays II	Python	🟢 Easy
380	Insert Delete GetRandom O(1)	C++, Python	🟡 Medium
383	Ransom Note	Python	🟢 Easy
392	Is Subsequence	Python	🟢 Easy
399	Evaluate Division	Python	🟡 Medium
433	Minimum Genetic Mutation	Python	🟡 Medium
452	Minimum Number of Arrows to Burst Balloons	Python	🟡 Medium
530	Minimum Absolute Difference in BST	Python	🟢 Easy
560	Subarray Sum Equals K	Python	🟡 Medium
637	Average of Levels in Binary Tree	Python	🟢 Easy
674	Longest Continuous Increasing Subsequence	Python	🟢 Easy
680	Valid Palindrome II	Python	🟢 Easy
772	Construct Quad Tree	Python	🟡 Medium
782	Jewels and Stones	Python	🟢 Easy
932	Monotonic Array	Python	🟢 Easy
945	Snakes and Ladders	Python	🟡 Medium
954	Maximum Sum Circular Subarray	Python	🟡 Medium
969	Number of Recent Calls	Python	🟢 Easy
1019	Squares of a Sorted Array	Python	🟢 Easy
1229	Shortest Path with Alternating Colors	Python	🟡 Medium
1542	Consecutive Characters	Python	🟢 Easy
1586	Longest Subarray of 1's After Deleting One Element	Python	🟡 Medium
2886	Faulty Keyboard	Python	🟢 Easy

Structure

algorithms/
├── cpp/
│   └── ...
├── python/
│   └── ...
└── java/
    └── ...

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Contribution

Found a bug or have suggestions? Feel free to open an Issue or submit a Pull Request!

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Contact

📧 Email: shafeev.dev@gmail.com 🔗 LeetCode Profile: https://leetcode.com/u/Lntck/

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Note about Automation

This repository features an automated workflow that:

• Parses solution files in the algorithms/ folder,
• Retrieves problem details (title, difficulty, problem ID) from the official LeetCode API,
• Automatically updates this README's Solutions Table on every push.

This means the table you see here always reflects the latest solutions without manual edits! 🚀

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