leetcode-java

Class Definition
ListNode
TreeNode
TrieNode
Interval
LRUCache
TreeLinkNode
UndirectedGraphNode

Search and Sort

Search (README)	Sort (README)
Linear Search	Selection Sort
Binary Search	Bubble Sort
Jump Search	Insertion Sort
Interpolation Search	Merge Sort
Exponential Search	Heap Sort
Ternary Search	Quick Sort
...	Radix Sort
	Counting Sort
	Bucket Sort
	Shell Sort
	Comb Sort
	...

Total: 258

Easy	Medium	Hard	-
68	144	44	2

Question	Solution	Difficulty
1. Two Sum	Solution	Easy
2. Add Two Numbers	Solution	Medium
3. Longest Substring Without Repeating Characters	Solution	Medium
4. Median of Two Sorted Arrays	Solution	Hard
5. Longest Palindromic Substring	Solution	Medium
8. String to Integer (atoi)	Solution	Medium
10. Regular Expression Matching	Solution	Hard
13. Roman to Integer	Solution	Easy
14. Longest Common Prefix	Solution	Easy
15. 3Sum	Solution	Medium
16. 3Sum Closest	Solution	Medium
17. Letter Combinations of a Phone Number	Solution	Medium
19. Remove Nth Node From End of List	Solution	Medium
20. Valid Parentheses	Solution	Easy
21. Merge Two Sorted Lists	Solution	Easy
22. Generate Parentheses	Solution	Medium
23. Merge k Sorted Lists	Solution	Hard
25. Reverse Nodes in k-Group	Solution	Hard
26. Remove Duplicates from Sorted Array	Solution	Easy
28. Implement strStr()	Solution	Easy
29. Divide Two Integers	Solution	Easy
31. Next Permutation	Solution	Medium
33. Search in Rotated Sorted Array	Solution	Medium
34. Search for a Range	Solution	Medium
35. Search Insert Position	Solution	Easy
36. Valid Sudoku	Solution	Medium
37. Sudoku Solver	Solution	Hard
41. First Missing Positive	Solution	Hard
42. Trapping Rain Water	Solution	Hard
44. Wildcard Matching	Solution	Hard
46. Permutations	Solution	Medium
47. Permutations II	Solution	Medium
48. Rotate Image	Solution	Medium
49. Group Anagrams	Solution	Medium
51. N-Queens	Solution	Hard
52. N-Queens II	Solution	Hard
53. Maximum Subarray	Solution	Easy
54. Spiral Matrix	Solution	Medium
55. Jump Game	Solution	Medium
56. Merge Intervals	Solution	Medium
57. Insert Interval	Solution	Hard
59. Spiral Matrix II	Solution	Medium
61. Rotate List	Solution	Medium
62. Unique Paths	Solution	Medium
63. Unique Paths II	Solution	Medium
64. Minimum Path Sum	Solution	Medium
66. Plus One	Solution	Easy
67. Add Binary	Solution	Easy
69. Sqrt(x)	Solution	Easy
70. Climbing Stairs	Solution	Easy
71. Simplify Path	Solution	Medium
72. Edit Distance	Solution	Hard
73. Set Matrix Zeroes	Solution	Medium
75. Sort Colors	Solution	Medium
76. Minimum Window Substring	Solution	Hard
78. Subsets	Solution	Medium
79. Word Search	Solution	Medium
80. Remove Duplicates from Sorted Array II	Solution	Medium
81. Search in Rotated Sorted Array II	Solution	Medium
82. Remove Duplicates from Sorted List II	Solution	Medium
84. Largest Rectangle in Histogram	Solution	Hard
85. Maximal Rectangle	Solution	Hard
86. Partition List	Solution	Medium
88. Merge Sorted Array	Solution	Easy
90. Subsets II	Solution	Medium
91. Decode Ways	Solution	Medium
92. Reverse Linked List II	Solution	Medium
93. Restore IP Addresses	Solution	Medium
94. Binary Tree Inorder Traversal	Solution	Medium
95. Unique Binary Search Trees II	Solution	Medium
96. Unique Binary Search Trees	Solution	Medium
97. Interleaving String	Solution	Hard
98. Validate Binary Search Tree	Solution	Medium
100. Same Tree	Solution	Easy
101. Symmetric Tree	Solution	Easy
102. Binary Tree Level Order Traversal	Solution	Medium
103. Binary Tree Zigzag Level Order Traversal	Solution	Medium
104. Maximum Depth of Binary Tree	Solution	Easy
105. Construct Binary Tree from Preorder and Inorder Traversal	Solution	Medium
107. Binary Tree Level Order Traversal II	Solution	Easy
108. Convert Sorted Array to Binary Search Tree	Solution	Easy
109. Convert Sorted List to Binary Search Tree	Solution	Medium
110. Balanced Binary Tree	Solution	Easy
111. Minimum Depth of Binary Tree	Solution	Easy
112. Path Sum	Solution	Easy
114. Flatten Binary Tree to Linked List	Solution	Medium
116. Populating Next Right Pointers in Each Node	Solution	Medium
117. Populating Next Right Pointers in Each Node II	Solution	Medium
121. Best Time to Buy and Sell Stock	Solution	Easy
122. Best Time to Buy and Sell Stock II	Solution	Easy
123. Best Time to Buy and Sell Stock III	Solution	Hard
124. Binary Tree Maximum Path Sum	Solution	Hard
125. Valid Palindrome	Solution	Easy
127. Word Ladder	Solution	Medium
128. Longest Consecutive Sequence	Solution	Hard
129. Sum Root to Leaf Numbers	Solution	Medium
130. Surrounded Regions	Solution	Medium
133. Clone Graph	Solution	Medium
136. Single Number	Solution	Easy
137. Single Number II	Solution	Medium
138. Copy List with Random Pointer	Solution	Medium
139. Word Break	Solution	Medium
141. Linked List Cycle	Solution	Easy
142. Linked List Cycle II	Solution	Easy
143. Reorder List	Solution	Medium
146. LRU Cache	Solution	Hard
147. Insertion Sort List	Solution	Medium
148. Sort List	Solution	Medium
149. Max Points on a Line	Solution	Hard
151. Reverse Words in a String	Solution	Medium
153. Find Minimum in Rotated Sorted Array	Solution	Medium
155. Min Stack	Solution	Easy
157. Read N Characters Given Read4	Solution	Easy
158. Read N Characters Given Read4 II - Call multiple times	Solution	Hard
160. Intersection of Two Linked Lists	Solution	Easy
162. Find Peak Element	Solution	Medium
163. Missing Ranges	Solution	Medium
166. Fraction to Recurring Decimal	Solution	Medium
169. Majority Element	Solution	Easy
173. Binary Search Tree Iterator	Solution	Medium
179. Largest Number	Solution	Medium
186. Reverse Words in a String II	Solution	Easy
188. Best Time to Buy and Sell Stock IV	Solution	Hard
189. Rotate Array	Solution	Easy
198. House Robber	Solution	Easy
200. Number of Islands	Solution	Medium
204. Count Primes	Solution	Easy
206. Reverse Linked List	Solution	Easy
207. Course Schedule	Solution	Medium
208. Implement Trie (Prefix Tree)	Solution	Medium
209. Minimum Size Subarray Sum	Solution	Medium
210. Course Schedule II	Solution	Medium
211. Add and Search Word - Data structure design	Solution	Medium
212. Word Search II	Solution	Hard
213. House Robber II	Solution	Medium
215. Kth Largest Element in an Array	Solution	Medium
217. Contains Duplicate	Solution	Easy
219. Contains Duplicate II	Solution	Easy
220. Contains Duplicate III	Solution	Medium
221. Maximal Square	Solution	Medium
223. Rectangle Area	Solution	Medium
224. Basic Calculator	Solution	Hard
225. Implement Stack using Queues	Solution	Easy
226. Invert Binary Tree	Solution	Easy
230. Kth Smallest Element in a BST	Solution	Medium
232. Implement Queue using Stacks	Solution	Easy
233. Number of Digit One	Solution	Hard
234. Palindrome Linked List	Solution	Easy
236. Lowest Common Ancestor of a Binary Tree	Solution	Medium
237. Delete Node in a Linked List	Solution	Easy
239. Sliding Window Maximum	Solution	Hard
240. Search a 2D Matrix II	Solution	Medium
241. Different Ways to Add Parentheses	Solution	Medium
242. Valid Anagram	Solution	Easy
249. Group Shifted Strings	Solution	Medium
253. Meeting Rooms II	Solution	Medium
257. Binary Tree Paths	Solution	Easy
259. 3Sum Smaller	Solution	Medium
269. Alien Dictionary	Solution	Hard
271. Encode and Decode Strings	Solution	Medium
273. Integer to English Words	Solution	Hard
274. H-Index	Solution	Medium
277. Find the Celebrity	Solution	Medium
278. First Bad Version	Solution	Easy
279. Perfect Squares	Solution	Medium
282. Expression Add Operators	Solution	Hard
283. Move Zeroes	Solution	Easy
285. Inorder Successor in BST	Solution	Medium
286. Walls and Gates	Solution	Medium
289. Game of Life	Solution	Medium
297. Serialize and Deserialize Binary Tree	Solution	Hard
299. Bulls and Cows	Solution	Medium
300. Longest Increasing Subsequence	Solution	Medium
301. Remove Invalid Parentheses	Solution	Hard
309. Best Time to Buy and Sell Stock with Cooldown	Solution	Medium
310. Minimum Height Trees	Solution	Medium
311. Sparse Matrix Multiplication	Solution	Medium
312. Burst Balloons	Solution	Hard
314. Binary Tree Vertical Order Traversal	Solution	Medium
315. Count of Smaller Numbers After Self	Solution	Hard
322. Coin Change	Solution	Medium
324. Wiggle Sort II	Solution	Medium
325. Maximum Size Subarray Sum Equals k	Solution	Medium
327. Count of Range Sum	Solution	Hard
328. Odd Even Linked List	Solution	Medium
334. Increasing Triplet Subsequence	Solution	Medium
336. Palindrome Pairs	Solution	Hard
337. House Robber III	Solution	Medium
338. Counting Bits	Solution	Medium
341. Flatten Nested List Iterator	Solution	Medium
344. Reverse String	Solution	Easy
346. Moving Average from Data Stream	Solution	Easy
347. Top K Frequent Elements	Solution	Medium
349. Intersection of Two Arrays	Solution	Easy
350. Intersection of Two Arrays II	Solution	Easy
361. Bomb Enemy	Solution	Medium
365. Water and Jug Problem	Solution	Medium
369. Plus One Linked List	Solution	Medium
373. Find K Pairs with Smallest Sums	Solution	Medium
378. Kth Smallest Element in a Sorted Matrix	Solution	Medium
380. Insert Delete GetRandom O(1)	Solution	Medium
383. Ransom Note	Solution	Easy
387. First Unique Character in a String	Solution	Easy
393. UTF-8 Validation	Solution	Medium
394. Decode String	Solution	Medium
399. Evaluate Division	Solution	Medium
406. Queue Reconstruction by Height	Solution	Medium
414. Third Maximum Number	Solution	Easy
416. Partition Equal Subset Sum	Solution	Medium
423. Reconstruct Original Digits from English	Solution	Medium
425. Word Squares	Solution	Hard
433. Minimum Genetic Mutation	Solution	Medium
443. String Compression	Solution	Easy
450. Delete Node in a BST	Solution	Medium
451. Sort Characters By Frequency	Solution	Medium
463. Island Perimeter	Solution	Easy
477. Total Hamming Distance	Solution	Medium
480. Sliding Window Median	Solution	Hard
490. The Maze	Solution	Medium
503. Next Greater Element II	Solution	Medium
508. Most Frequent Subtree Sum	Solution	Medium
513. Find Bottom Left Tree Value	Solution	Medium
518. Coin Change 2	Solution	Medium
525. Contiguous Array	Solution	Medium
535. Encode and Decode TinyURL	Solution	Medium
541. Reverse String II	Solution	Easy
543. Diameter of Binary Tree	Solution	Easy
544. Output Contest Matches	Solution	Medium
547. Friend Circles	Solution	Medium
554. Brick Wall	Solution	Medium
557. Reverse Words in a String III	Solution	Easy
560. Subarray Sum Equals K	Solution	Medium
572. Subtree of Another Tree	Solution	Easy
611. Valid Triangle Number	Solution	Medium
616. Add Bold Tag in String	Solution	Medium
621. Task Scheduler	Solution	Medium
623. Add One Row to Tree	Solution	Medium
628. Maximum Product of Three Numbers	Solution	Easy
632. Smallest Range	Solution	Hard
639. Decode Ways II	Solution	Hard
647. Palindromic Substrings	Solution	Medium
659. Split Array into Consecutive Subsequences	Solution	Medium
671. Second Minimum Node In a Binary Tree	Solution	Easy
674. Longest Continuous Increasing Subsequence	Solution	Easy
680. Valid Palindrome II	Solution	Easy
684. Redundant Connection	Solution	Medium
689. Maximum Sum of 3 Non-Overlapping Subarrays	Solution	Hard
692. Top K Frequent Words	Solution	Medium
714. Best Time to Buy and Sell Stock with Transaction Fee	Solution	Medium
716. Max Stack	Solution	Hard
718. Maximum Length of Repeated Subarray	Solution	Medium
721. Accounts Merge	Solution	Medium
727. Minimum Window Subsequence	Solution	Hard
746. Min Cost Climbing Stairs	Solution	Easy
748. Shortest Completing Word	Solution	Medium
765. Couples Holding Hands	Solution	Hard
819. Most Common Word	Solution	Easy
Convert Binary Search Tree to Sorted Doubly Linked List	Solution	-
HighestPopulationYear	Solution	-

May	JUN	Jul
	13
2017	2018	2019

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Total: 258