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.gitignore
.gitignore
 
 
1 - Two Sum.cpp
1 - Two Sum.cpp
 
 
1 - Two Sum.py
1 - Two Sum.py
 
 
10 - Regular Expression Matching.py
10 - Regular Expression Matching.py
 
 
102 - Binary Tree Level Order Traversal.py
102 - Binary Tree Level Order Traversal.py
 
 
105-Construct_Binary_Tree_from_Preorder_and_Inorder_Traversal.cpp
105-Construct_Binary_Tree_from_Preorder_and_Inorder_Traversal.cpp
 
 
106-Construct_Binary_Tree_from_Inorder_and_Postorder_Traversal.cpp
106-Construct_Binary_Tree_from_Inorder_and_Postorder_Traversal.cpp
 
 
112-Path_Sum.cpp
112-Path_Sum.cpp
 
 
121 - Best Time to Buy and Sell Stock.py
121 - Best Time to Buy and Sell Stock.py
 
 
124 - Maximum Binary Tree Path Sum.py
124 - Maximum Binary Tree Path Sum.py
 
 
125 - Valid Palindrome.py
125 - Valid Palindrome.py
 
 
127 - Word Ladder.py
127 - Word Ladder.py
 
 
128 - Longest Consecutive Sequence.py
128 - Longest Consecutive Sequence.py
 
 
13 - Roman to Integer.py
13 - Roman to Integer.py
 
 
130 - Surrounded Regions.py
130 - Surrounded Regions.py
 
 
136 - Single Number.py
136 - Single Number.py
 
 
139 - Work Break.py
139 - Work Break.py
 
 
14 - Longest Common Prefix.py
14 - Longest Common Prefix.py
 
 
146 - LRU Cache.py
146 - LRU Cache.py
 
 
15 - 3Sum.py
15 - 3Sum.py
 
 
151 - Reverse Words in a String.py
151 - Reverse Words in a String.py
 
 
162-Find_Peak_Element.cpp
162-Find_Peak_Element.cpp
 
 
168 - Excel Sheet Column Title.py
168 - Excel Sheet Column Title.py
 
 
17 - Letter Combinations of a Phone Number.py
17 - Letter Combinations of a Phone Number.py
 
 
173 - Binary Search Tree Iterator.py
173 - Binary Search Tree Iterator.py
 
 
20 - Valid Parenthesis.py
20 - Valid Parenthesis.py
 
 
204-Count_Primes.cpp
204-Count_Primes.cpp
 
 
206 - Reverse Linked List.py
206 - Reverse Linked List.py
 
 
208 - Implement Trie (Prefix Tree).py
208 - Implement Trie (Prefix Tree).py
 
 
215 - Kth Largest Element.cpp
215 - Kth Largest Element.cpp
 
 
215 - Kth Largest Element.py
215 - Kth Largest Element.py
 
 
217 - Contains Duplicate.py
217 - Contains Duplicate.py
 
 
218 - The Skyline Problem.py
218 - The Skyline Problem.py
 
 
219 - Contains Duplicate II.py
219 - Contains Duplicate II.py
 
 
220 - Contains Duplicate III.py
220 - Contains Duplicate III.py
 
 
23 - Merge k Sorted Lists.py
23 - Merge k Sorted Lists.py
 
 
234 - Palindrome Linked List.py
234 - Palindrome Linked List.py
 
 
235 - Lowest Common Ancestor of a Binary Search Tree.py
235 - Lowest Common Ancestor of a Binary Search Tree.py
 
 
236 - Lowest Common Ancestor of a Binary Tree.py
236 - Lowest Common Ancestor of a Binary Tree.py
 
 
238 - Product of Array Except Self.py
238 - Product of Array Except Self.py
 
 
251 - Flatten 2D Vector.py
251 - Flatten 2D Vector.py
 
 
253 - Meeting Rooms 2.py
253 - Meeting Rooms 2.py
 
 
26 - Remove Duplicates from Sorted Array.py
26 - Remove Duplicates from Sorted Array.py
 
 
268 - Missing Number.py
268 - Missing Number.py
 
 
269 - Alien Dictionary.py
269 - Alien Dictionary.py
 
 
273 - Integer to English Words.py
273 - Integer to English Words.py
 
 
277 - Find the Celebrity.py
277 - Find the Celebrity.py
 
 
28 - Implement strStr().py
28 - Implement strStr().py
 
 
280 - Wiggle Sort.py
280 - Wiggle Sort.py
 
 
283 - Move Zeroes.py
283 - Move Zeroes.py
 
 
297 - Serialize and Deserialize Binary Tree.py
297 - Serialize and Deserialize Binary Tree.py
 
 
300 - Longest Increasing Subsequence.py
300 - Longest Increasing Subsequence.py
 
 
301 - Remove Invalid Parentheses.py
301 - Remove Invalid Parentheses.py
 
 
322 - Coin Change.py
322 - Coin Change.py
 
 
324 - Wiggle Sort II.py
324 - Wiggle Sort II.py
 
 
325 - Maximum Size Subarray Sum Equals k.py
325 - Maximum Size Subarray Sum Equals k.py
 
 
33 - Search in Rotated Array.py
33 - Search in Rotated Array.py
 
 
336 - Palindrome Pairs.py
336 - Palindrome Pairs.py
 
 
339 - Nested List Weight Sum.py
339 - Nested List Weight Sum.py
 
 
341 - Flatten Nested List Iterator.py
341 - Flatten Nested List Iterator.py
 
 
38 - Count and Say.py
38 - Count and Say.py
 
 
380 - Insert Delete GetRandom O(1).py
380 - Insert Delete GetRandom O(1).py
 
 
39 - Combination Sum.py
39 - Combination Sum.py
 
 
397 - Integer Replacement.py
397 - Integer Replacement.py
 
 
409-Longest_Palindrome.cpp
409-Longest_Palindrome.cpp
 
 
41 - First Missing Positive.py
41 - First Missing Positive.py
 
 
417 - Pacific Atlantic Water Flow.java
417 - Pacific Atlantic Water Flow.java
 
 
42 - Trapping Rainwater.py
42 - Trapping Rainwater.py
 
 
43 - Multiply Strings.py
43 - Multiply Strings.py
 
 
44 - Wildcard Matching.py
44 - Wildcard Matching.py
 
 
46 - Permutations.py
46 - Permutations.py
 
 
461 - Hamming Distance.py
461 - Hamming Distance.py
 
 
47 - Permutations II.py
47 - Permutations II.py
 
 
49 - Group Anagrams.py
49 - Group Anagrams.py
 
 
5 - Longest Palindromic Substring.py
5 - Longest Palindromic Substring.py
 
 
50 - Pow(x, n).py
50 - Pow(x, n).py
 
 
515-Find_Largest_Value_in_Each_Tree_Row.cpp
515-Find_Largest_Value_in_Each_Tree_Row.cpp
 
 
516 - Longest Palindromic Subsequence.py
516 - Longest Palindromic Subsequence.py
 
 
518 - Coin Change 2.py
518 - Coin Change 2.py
 
 
53 - Maximum Subarray.py
53 - Maximum Subarray.py
 
 
535 - Encode and Decode TinyURL.py
535 - Encode and Decode TinyURL.py
 
 
54 - Spiral Matrix.py
54 - Spiral Matrix.py
 
 
56 - Merge Intervals.py
56 - Merge Intervals.py
 
 
583 - Delete Operation for Two Strings.py
583 - Delete Operation for Two Strings.py
 
 
62-Unique_Paths.cpp
62-Unique_Paths.cpp
 
 
621 - Task Scheduler.py
621 - Task Scheduler.py
 
 
647 - Palindromic Substrings.py
647 - Palindromic Substrings.py
 
 
67 - Add Binary.py
67 - Add Binary.py
 
 
674 - Longest Continuous Increasing Subsequence.py
674 - Longest Continuous Increasing Subsequence.py
 
 
678 - Valid Parenthesis String.py
678 - Valid Parenthesis String.py
 
 
69 - Sqrt(x).py
69 - Sqrt(x).py
 
 
72 - Edit Distance.cpp
72 - Edit Distance.cpp
 
 
75 - Sort Colors.py
75 - Sort Colors.py
 
 
751 - IP to CIDR.py
751 - IP to CIDR.py
 
 
755 - Pour Water.py
755 - Pour Water.py
 
 
759 - Employee Free Time.py
759 - Employee Free Time.py
 
 
76 - Minimum Window Substring.py
76 - Minimum Window Substring.py
 
 
773 - Sliding Puzzle.py
773 - Sliding Puzzle.py
 
 
78 - Subsets.py
78 - Subsets.py
 
 
787 - Cheapest Flights Within K Stops.py
787 - Cheapest Flights Within K Stops.py
 
 

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LeetCode Solutions

New Solutions Added Regularly

Looking to land your next job interview, score higher in coding competitions, or just improve your current understanding of algorithms? You've come to the right place.

This repository is a home for elegant solutions to LeetCode problems :)

Contributions are always appreciated!

  • Open an issue to request help with a specific LeetCode problem
  • Make a pull request if you'd like to add a solution yourself

Prefer HackerRank problems? Find my HackerRank solutions here

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