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This repository contains solutions and resources for LeetCode algorithm problems.

The solutions are derived from my own thinking and the discussion. They are cleaned and optimized carefully, thus more readable and understandable!

You can also check https://linlaw0229.github.io/ for detailed solutions.

Name		Name	Last commit message	Last commit date
Latest commit History 410 Commits
036. Valid Sudoku		036. Valid Sudoku
1. Two Sum		1. Two Sum
10. Regular Expression Matching		10. Regular Expression Matching
100. Same Tree		100. Same Tree
101. Symmetric Tree		101. Symmetric Tree
102. Binary Tree Level Order Traversal		102. Binary Tree Level Order Traversal
103. Binary Tree Zigzag Level Order Traversal		103. Binary Tree Zigzag Level Order Traversal
104. Maximum Depth of Binary Tree		104. Maximum Depth of Binary Tree
105. Construct Binary Tree from Preorder and Inorder Traversal		105. Construct Binary Tree from Preorder and Inorder Traversal
106. Construct Binary Tree from Inorder and Postorder Traversal		106. Construct Binary Tree from Inorder and Postorder Traversal
108. Convert Sorted Array to Binary Search Tree		108. Convert Sorted Array to Binary Search Tree
109. Convert Sorted List to Binary Search Tree		109. Convert Sorted List to Binary Search Tree
11. Container With Most Water		11. Container With Most Water
110. Balanced Binary Tree		110. Balanced Binary Tree
111. Minimum Depth of Binary Tree		111. Minimum Depth of Binary Tree
112. Path Sum		112. Path Sum
113. Path Sum II		113. Path Sum II
114. Flatten Binary Tree to Linked List		114. Flatten Binary Tree to Linked List
115. Distinct Subsequences		115. Distinct Subsequences
116. Populating Next Right Pointers in Each Node		116. Populating Next Right Pointers in Each Node
117. Populating Next Right Pointers in Each Node II		117. Populating Next Right Pointers in Each Node II
118. Pascal's Triangle		118. Pascal's Triangle
119. Pascal's Triangle II		119. Pascal's Triangle II
12. Integer to Roman		12. Integer to Roman
120. Triangle		120. Triangle
121. Best Time to Buy and Sell Stock		121. Best Time to Buy and Sell Stock
122. Best Time to Buy and Sell Stock II		122. Best Time to Buy and Sell Stock II
123. Best Time to Buy and Sell Stock III		123. Best Time to Buy and Sell Stock III
124. Binary Tree Maximum Path Sum		124. Binary Tree Maximum Path Sum
125. Valid Palindrome		125. Valid Palindrome
126. Word Ladder II		126. Word Ladder II
127. Word Ladder		127. Word Ladder
128. Longest Consecutive Sequence		128. Longest Consecutive Sequence
129. Sum Root to Leaf Numbers		129. Sum Root to Leaf Numbers
13. Roman to Integer		13. Roman to Integer
130. Surrounded Regions		130. Surrounded Regions
131. Palindrome Partitioning		131. Palindrome Partitioning
133. Clone Graph		133. Clone Graph
134. Gas Station		134. Gas Station
136. Single Number		136. Single Number
138. Copy List with Random Pointer		138. Copy List with Random Pointer
139. Word Break		139. Word Break
14. Longest Common Prefix		14. Longest Common Prefix
141. Linked List Cycle		141. Linked List Cycle
142. Linked List Cycle II		142. Linked List Cycle II
143. Reorder List		143. Reorder List
144. Binary Tree Preorder Traversal		144. Binary Tree Preorder Traversal
147. Insertion Sort List		147. Insertion Sort List
148. Sort List		148. Sort List
149. Max Points on a Line		149. Max Points on a Line
15. 3Sum		15. 3Sum
150. Evaluate Reverse Polish Notation		150. Evaluate Reverse Polish Notation
151. Reverse Words in a String		151. Reverse Words in a String
152. Maximum Product Subarray		152. Maximum Product Subarray
153. Find Minimum in Rotated Sorted Array		153. Find Minimum in Rotated Sorted Array
154. Find Minimum in Rotated Sorted Array II		154. Find Minimum in Rotated Sorted Array II
155. Min Stack		155. Min Stack
156. Binary Tree Upside Down		156. Binary Tree Upside Down
157. Read N Characters Given Read4		157. Read N Characters Given Read4
158. Read N Characters Given Read4 II - Call multiple times		158. Read N Characters Given Read4 II - Call multiple times
159. Longest Substring with At Most Two Distinct Characters		159. Longest Substring with At Most Two Distinct Characters
16. 3Sum Closest		16. 3Sum Closest
160. Intersection of Two Linked Lists		160. Intersection of Two Linked Lists
161. One Edit Distance		161. One Edit Distance
162. Find Peak Element		162. Find Peak Element
163. Missing Ranges		163. Missing Ranges
165. Compare Version Numbers		165. Compare Version Numbers
166. Fraction to Recurring Decimal		166. Fraction to Recurring Decimal
167. Two Sum II - Input array is sorted		167. Two Sum II - Input array is sorted
169. Majority Element		169. Majority Element
17. Letter Combinations of a Phone Number		17. Letter Combinations of a Phone Number
171. Excel Sheet Column Number		171. Excel Sheet Column Number
172. Factorial Trailing Zeroes		172. Factorial Trailing Zeroes
173. Binary Search Tree Iterator		173. Binary Search Tree Iterator
179. Largest Number		179. Largest Number
18. 4Sum		18. 4Sum
186. Reverse Words in a String II		186. Reverse Words in a String II
187. Repeated DNA Sequences		187. Repeated DNA Sequences
189. Rotate Array		189. Rotate Array
19. Remove Nth Node From End of List		19. Remove Nth Node From End of List
190. Reverse Bits		190. Reverse Bits
191. Number of 1 Bits		191. Number of 1 Bits
198. House Robber		198. House Robber
199. Binary Tree Right Side View		199. Binary Tree Right Side View
2. Add Two Numbers		2. Add Two Numbers
20. Valid Parentheses		20. Valid Parentheses
200. Number of Islands		200. Number of Islands
202. Happy Number		202. Happy Number
203. Remove Linked List Elements		203. Remove Linked List Elements
204. Count Primes		204. Count Primes
205. Isomorphic Strings		205. Isomorphic Strings
206. Reverse Linked List		206. Reverse Linked List
207. Course Schedule		207. Course Schedule
208. Implement Trie (Prefix Tree)		208. Implement Trie (Prefix Tree)
209. Minimum Size Subarray Sum		209. Minimum Size Subarray Sum
21. Merge Two Sorted Lists		21. Merge Two Sorted Lists
211. Add and Search Word - Data structure design		211. Add and Search Word - Data structure design
213. House Robber II		213. House Robber II
215. Kth Largest Element in an Array		215. Kth Largest Element in an Array
216. Combination Sum III		216. Combination Sum III

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