leetcode-java

Class Definition
ListNode
TreeNode
Interval
TreeLinkNode
UndirectedGraphNode
Point

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
	...

Knapsack Problem

Knapsack Problem
ZeroOneKnapsack
CompleteKnapsack

Data Structures

Data Structures
TrieNode
Trie
LRUCache
LFUCache
BinarySearchTree
BinarySearchTreeWithParent
BinaryIndexedTree
MinHeap
DisjointSet (Union-Find)
Graph

Total: 538

Easy	Medium	Hard	-
142	292	92	12

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
9. Palindrome Number	Solution	Easy
8. String to Integer (atoi)	Solution	Medium
10. Regular Expression Matching	Solution	Hard
11. Container With Most Water	Solution	Medium
12. Integer to Roman	Solution	Medium
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
18. 4Sum	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
32. Longest Valid Parentheses	Solution	Hard
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
39. Combination Sum	Solution	Medium
41. First Missing Positive	Solution	Hard
42. Trapping Rain Water	Solution	Hard
44. Wildcard Matching	Solution	Hard
45. Jump Game II	Solution	Hard
46. Permutations	Solution	Medium
47. Permutations II	Solution	Medium
48. Rotate Image	Solution	Medium
49. Group Anagrams	Solution	Medium
50. Pow(x, n)	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
60. Permutation Sequence	Solution	Medium
61. Rotate List	Solution	Medium
62. Unique Paths	Solution	Medium
63. Unique Paths II	Solution	Medium
64. Minimum Path Sum	Solution	Medium
65. Valid Number	Solution	Hard
66. Plus One	Solution	Easy
67. Add Binary	Solution	Easy
68. Text Justification	Solution	Hard
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
74. Search a 2D Matrix	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
83. Remove Duplicates from Sorted List	Solution	Easy
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
106. Construct Binary Tree from Inorder and Postorder 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
113. Path Sum II	Solution	Medium
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
119. Pascal's Triangle II	Solution	Easy
120. Triangle	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
126. Word Ladder II	Solution	Hard
127. Word Ladder	Solution	Medium
128. Longest Consecutive Sequence	Solution	Hard
129. Sum Root to Leaf Numbers	Solution	Medium
130. Surrounded Regions	Solution	Medium
131. Palindrome Partitioning	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
140. Word Break II	Solution	Hard
141. Linked List Cycle	Solution	Easy
142. Linked List Cycle II	Solution	Easy
143. Reorder List	Solution	Medium
144. Binary Tree Preorder Traversal	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
150. Evaluate Reverse Polish Notation	Solution	Medium
151. Reverse Words in a String	Solution	Medium
152. Maximum Product Subarray	Solution	Medium
153. Find Minimum in Rotated Sorted Array	Solution	Medium
154. Find Minimum in Rotated Sorted Array II	Solution	Hard
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
159. Longest Substring with At Most Two Distinct Characters	Solution	Hard
160. Intersection of Two Linked Lists	Solution	Easy
161. One Edit Distance	Solution	Medium
162. Find Peak Element	Solution	Medium
163. Missing Ranges	Solution	Medium
165. Compare Version Numbers	Solution	Medium
166. Fraction to Recurring Decimal	Solution	Medium
167. Two Sum II - Input array is sorted	Solution	Easy
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
187. Repeated DNA Sequences	Solution	Medium
188. Best Time to Buy and Sell Stock IV	Solution	Hard
189. Rotate Array	Solution	Easy
198. House Robber	Solution	Easy
199. Binary Tree Right Side View	Solution	Medium
200. Number of Islands	Solution	Medium
201. Bitwise AND of Numbers Range	Solution	Medium
202. Happy Number	Solution	Easy
203. Remove Linked List Elements	Solution	Easy
204. Count Primes	Solution	Easy
205. Isomorphic Strings	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
214. Shortest Palindrome	Solution	Medium
215. Kth Largest Element in an Array	Solution	Medium
216. Combination Sum III	Solution	Medium
217. Contains Duplicate	Solution	Easy
218. The Skyline Problem	Solution	Hard
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
227. Basic Calculator II	Solution	Medium
228. Summary Ranges	Solution	Medium
230. Kth Smallest Element in a BST	Solution	Medium
231. Power of Two	Solution	Easy
232. Implement Queue using Stacks	Solution	Easy
233. Number of Digit One	Solution	Hard
234. Palindrome Linked List	Solution	Easy
235. Lowest Common Ancestor of a Binary Search Tree	Solution	Easy
236. Lowest Common Ancestor of a Binary Tree	Solution	Medium
237. Delete Node in a Linked List	Solution	Easy
238. Product of Array Except Self	Solution	Medium
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
243. Shortest Word Distance	Solution	Easy
246. Strobogrammatic Number	Solution	Easy
247. Strobogrammatic Number II	Solution	Medium
249. Group Shifted Strings	Solution	Medium
251. Flatten 2D Vector	Solution	Medium
252. Meeting Rooms	Solution	Easy
253. Meeting Rooms II	Solution	Medium
255. Verify Preorder Sequence in Binary Search Tree	Solution	Medium
256. Paint House	Solution	Easy
257. Binary Tree Paths	Solution	Easy
259. 3Sum Smaller	Solution	Medium
261. Graph Valid Tree	Solution	Medium
263. Ugly Number	Solution	Easy
264. Ugly Number II	Solution	Medium
265. Paint House II	Solution	Hard
267. Palindrome Permutation II	Solution	Medium
268. Missing Number	Solution	Easy
269. Alien Dictionary	Solution	Hard
270. Closest Binary Search Tree Value	Solution	Easy
271. Encode and Decode Strings	Solution	Medium
272. Closest Binary Search Tree Value II	Solution	Medium
273. Integer to English Words	Solution	Hard
274. H-Index	Solution	Medium
276. Paint Fence	Solution	Easy
277. Find the Celebrity	Solution	Medium
278. First Bad Version	Solution	Easy
279. Perfect Squares	Solution	Medium
280. Wiggle Sort	Solution	Medium
281. Zigzag Iterator	Solution	Medium
282. Expression Add Operators	Solution	Hard
283. Move Zeroes	Solution	Easy
284. Peeking Iterator	Solution	Medium
285. Inorder Successor in BST	Solution	Medium
286. Walls and Gates	Solution	Medium
287. Find the Duplicate Number	Solution	Medium
288. Unique Word Abbreviation	Solution	Medium
289. Game of Life	Solution	Medium
290. Word Pattern	Solution	Easy
291. Word Pattern II	Solution	Hard
293. Flip Game	Solution	Easy
295. Find Median from Data Stream	Solution	Hard
296. Best Meeting Point	Solution	Hard
297. Serialize and Deserialize Binary Tree	Solution	Hard
298. Binary Tree Longest Consecutive Sequence	Solution	Medium
299. Bulls and Cows	Solution	Medium
300. Longest Increasing Subsequence	Solution	Medium
301. Remove Invalid Parentheses	Solution	Hard
303. Range Sum Query - Immutable	Solution	Easy
304. Range Sum Query 2D - Immutable	Solution	Medium
305. Number of Islands II	Solution	Hard
307. Range Sum Query - Mutable	Solution	Medium
308. Range Sum Query 2D - Mutable	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
313. Super Ugly Number	Solution	Medium
314. Binary Tree Vertical Order Traversal	Solution	Medium
315. Count of Smaller Numbers After Self	Solution	Hard
317. Shortest Distance from All Buildings	Solution	Hard
318. Maximum Product of Word Lengths	Solution	Medium
320. Generalized Abbreviation	Solution	Medium
322. Coin Change	Solution	Medium
323. Number of Connected Components in an Undirected Graph	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
332. Reconstruct Itinerary	Solution	Medium
333. Largest BST Subtree	Solution	Medium
334. Increasing Triplet Subsequence	Solution	Medium
336. Palindrome Pairs	Solution	Hard
337. House Robber III	Solution	Medium
338. Counting Bits	Solution	Medium
339. Nested List Weight Sum	Solution	Easy
340. Longest Substring with At Most K Distinct Characters	Solution	Hard
341. Flatten Nested List Iterator	Solution	Medium
343. Integer Break	Solution	Medium
344. Reverse String	Solution	Easy
345. Reverse Vowels of a String	Solution	Easy
346. Moving Average from Data Stream	Solution	Easy
347. Top K Frequent Elements	Solution	Medium
348. Design Tic-Tac-Toe	Solution	Medium
349. Intersection of Two Arrays	Solution	Easy
350. Intersection of Two Arrays II	Solution	Easy
351. Android Unlock Patterns	Solution	Medium
352. Data Stream as Disjoint Intervals	Solution	Hard
353. Design Snake Game	Solution	Medium
354. Russian Doll Envelopes	Solution	Hard
355. Design Twitter	Solution	Medium
357. Count Numbers with Unique Digits	Solution	Medium
358. Rearrange String k Distance Apart	Solution	Hard
359. Logger Rate Limiter	Solution	Easy
360. Sort Transformed Array	Solution	Medium
361. Bomb Enemy	Solution	Medium
362. Design Hit Counter	Solution	Medium
363. Max Sum of Rectangle No Larger Than K	Solution	Hard
365. Water and Jug Problem	Solution	Medium
368. Largest Divisible Subset	Solution	Medium
369. Plus One Linked List	Solution	Medium
370. Range Addition	Solution	Medium
373. Find K Pairs with Smallest Sums	Solution	Medium
375. Guess Number Higher or Lower II	Solution	Medium
377. Combination Sum IV	Solution	Medium
378. Kth Smallest Element in a Sorted Matrix	Solution	Medium
380. Insert Delete GetRandom O(1)	Solution	Medium
382. Linked List Random Node	Solution	Medium
383. Ransom Note	Solution	Easy
384. Shuffle an Array	Solution	Medium
386. Lexicographical Numbers	Solution	Medium
387. First Unique Character in a String	Solution	Easy
388. Longest Absolute File Path	Solution	Medium
392. Is Subsequence	Solution	Medium
393. UTF-8 Validation	Solution	Medium
394. Decode String	Solution	Medium
396. Rotate Function	Solution	Medium
399. Evaluate Division	Solution	Medium
403. Frog Jump	Solution	Hard
405. Convert a Number to Hexadecimal	Solution	Easy
406. Queue Reconstruction by Height	Solution	Medium
407. Trapping Rain Water II	Solution	Medium
408. Valid Word Abbreviation	Solution	Easy
409. Longest Palindrome	Solution	Easy
410. Split Array Largest Sum	Solution	Hard
412. Fizz Buzz	Solution	Easy
414. Third Maximum Number	Solution	Easy
415. Add Strings	Solution	Easy
416. Partition Equal Subset Sum	Solution	Medium
417. Pacific Atlantic Water Flow	Solution	Medium
418. Sentence Screen Fitting	Solution	Medium
421. Maximum XOR of Two Numbers in an Array	Solution	Medium
423. Reconstruct Original Digits from English	Solution	Medium
424. Longest Repeating Character Replacement	Solution	Medium
425. Word Squares	Solution	Hard
427. Construct Quad Tree	Solution	Easy
429. N-ary Tree Level Order Traversal	Solution	Easy
432. All O`one Data Structure	Solution	Hard
433. Minimum Genetic Mutation	Solution	Medium
435. Non-overlapping Intervals	Solution	Medium
437. Path Sum III	Solution	Easy
438. Find All Anagrams in a String	Solution	Easy
443. String Compression	Solution	Easy
445. Add Two Numbers II	Solution	Medium
448. Find All Numbers Disappeared in an Array	Solution	Easy
449. Serialize and Deserialize BST	Solution	Medium
450. Delete Node in a BST	Solution	Medium
454. 4Sum II	Solution	Medium
451. Sort Characters By Frequency	Solution	Medium
459. Repeated Substring Pattern	Solution	Easy
460. LFU Cache	Solution	Hard
462. Minimum Moves to Equal Array Elements II	Solution	Medium
463. Island Perimeter	Solution	Easy
464. Can I Win	Solution	Medium
465. Optimal Account Balancing	Solution	Hard
472. Concatenated Words	Solution	Hard
473. Matchsticks to Square	Solution	Medium
474. Ones and Zeroes	Solution	Medium
477. Total Hamming Distance	Solution	Medium
480. Sliding Window Median	Solution	Hard
481. Magical String	Solution	Medium
482. License Key Formatting	Solution	Easy
485. Max Consecutive Ones	Solution	Easy
486. Predict the Winner	Solution	Medium
487. Max Consecutive Ones II	Solution	Medium
490. The Maze	Solution	Medium
491. Increasing Subsequences	Solution	Medium
494. Target Sum	Solution	Medium
496. Next Greater Element I	Solution	Easy
498. Diagonal Traverse	Solution	Medium
499. The Maze III	Solution	Hard
503. Next Greater Element II	Solution	Medium
505. The Maze II	Solution	Hard
508. Most Frequent Subtree Sum	Solution	Medium
513. Find Bottom Left Tree Value	Solution	Medium
515. Find Largest Value in Each Tree Row	Solution	Medium
516. Longest Palindromic Subsequence	Solution	Medium
518. Coin Change 2	Solution	Medium
519. Random Flip Matrix	Solution	Medium
523. Continuous Subarray Sum	Solution	Medium
525. Contiguous Array	Solution	Medium
527. Word Abbreviation	Solution	Hard
529. Minesweeper	Solution	Medium
530. Minimum Absolute Difference in BST	Solution	Easy
531. Lonely Pixel I	Solution	Medium
535. Encode and Decode TinyURL	Solution	Medium
536. Construct Binary Tree from String	Solution	Medium
538. Convert BST to Greater Tree	Solution	Easy
540. Single Element in a Sorted Array	Solution	Medium
541. Reverse String II	Solution	Easy
542. 01 Matrix	Solution	Medium
543. Diameter of Binary Tree	Solution	Easy
544. Output Contest Matches	Solution	Medium
545. Boundary of Binary Tree	Solution	Medium
547. Friend Circles	Solution	Medium
554. Brick Wall	Solution	Medium
556. Next Greater Element III	Solution	Medium
557. Reverse Words in a String III	Solution	Easy
558. Quad Tree Intersection	Solution	Easy
560. Subarray Sum Equals K	Solution	Medium
567. Permutation in String	Solution	Easy
568. Maximum Vacation Days	Solution	Hard
572. Subtree of Another Tree	Solution	Easy
582. Kill Process	Solution	Medium
588. Design In-Memory File System	Solution	Hard
590. N-ary Tree Postorder Traversal	Solution	Easy
594. Longest Harmonious Subsequence	Solution	Easy
604. Design Compressed String Iterator	Solution	Easy
611. Valid Triangle Number	Solution	Medium
616. Add Bold Tag in String	Solution	Medium
621. Task Scheduler	Solution	Medium
622. Design Circular Queue	Solution	Medium
623. Add One Row to Tree	Solution	Medium
628. Maximum Product of Three Numbers	Solution	Easy
632. Smallest Range	Solution	Hard
633. Sum of Square Numbers	Solution	Easy
635. Design Log Storage System	Solution	Hard
636. Exclusive Time of Functions	Solution	Medium
637. Average of Levels in Binary Tree	Solution	Easy
639. Decode Ways II	Solution	Hard
640. Solve the Equation	Solution	Medium
641. Design Circular Deque	Solution	Medium
642. Design Search Autocomplete System	Solution	Hard
643. Maximum Average Subarray I	Solution	Easy
646. Maximum Length of Pair Chain	Solution	Medium
647. Palindromic Substrings	Solution	Medium
648. Replace Words	Solution	Medium
652. Find Duplicate Subtrees	Solution	Medium
653. Two Sum IV - Input is a BST	Solution	Easy
654. Maximum Binary Tree	Solution	Medium
657. Judge Route Circle	Solution	Easy
658. Find K Closest Elements	Solution	Medium
659. Split Array into Consecutive Subsequences	Solution	Medium
661. Image Smoother	Solution	Easy
662. Maximum Width of Binary Tree	Solution	Medium
663. Equal Tree Partition	Solution	Medium
665. Non-decreasing Array	Solution	Easy
669. Trim a Binary Search Tree	Solution	Easy
671. Second Minimum Node In a Binary Tree	Solution	Easy
673. Number of Longest Increasing Subsequence	Solution	Medium
674. Longest Continuous Increasing Subsequence	Solution	Easy
675. Cut Off Trees for Golf Event	Solution	Hard
676. Implement Magic Dictionary	Solution	Medium
677. Map Sum Pairs	Solution	Medium
678. Valid Parenthesis String	Solution	Medium
680. Valid Palindrome II	Solution	Easy
681. Next Closest Time	Solution	Medium
682. Baseball Game	Solution	Easy
683. K Empty Slots	Solution	Hard
684. Redundant Connection	Solution	Medium
685. Redundant Connection II	Solution	Hard
686. Repeated String Match	Solution	Easy
687. Longest Univalue Path	Solution	Easy
689. Maximum Sum of 3 Non-Overlapping Subarrays	Solution	Hard
692. Top K Frequent Words	Solution	Medium
695. Max Area of Island	Solution	Medium
698. Partition to K Equal Sum Subsets	Solution	Medium
702. Search in a Sorted Array of Unknown Size	Solution	Medium
705. Design HashSet	Solution	Easy
706. Design HashMap	Solution	Easy
707. Design Linked List	Solution	Easy
709. To Lower Case	Solution	Easy
712. Minimum ASCII Delete Sum for Two Strings	Solution	Medium
713. Subarray Product Less Than K	Solution	Medium
714. Best Time to Buy and Sell Stock with Transaction Fee	Solution	Medium
715. Range Module	Solution	Hard
716. Max Stack	Solution	Hard
718. Maximum Length of Repeated Subarray	Solution	Medium
719. Find K-th Smallest Pair Distance	Solution	Hard
720. Longest Word in Dictionary	Solution	Easy
721. Accounts Merge	Solution	Medium
727. Minimum Window Subsequence	Solution	Hard
729. My Calendar I	Solution	Medium
731. My Calendar II	Solution	Medium
734. Sentence Similarity	Solution	Easy
737. Sentence Similarity II	Solution	Medium
738. Monotone Increasing Digits	Solution	Medium
739. Daily Temperatures	Solution	Medium
740. Delete and Earn	Solution	Medium
746. Min Cost Climbing Stairs	Solution	Easy
748. Shortest Completing Word	Solution	Medium
750. Number Of Corner Rectangles	Solution	Medium
752. Open the Lock	Solution	Medium
759. Employee Free Time	Solution	Hard
760. Find Anagram Mappings	Solution	Easy
763. Partition Labels	Solution	Medium
765. Couples Holding Hands	Solution	Hard
767. Reorganize String	Solution	Medium
768. Max Chunks To Make Sorted II	Solution	Hard
769. Max Chunks To Make Sorted	Solution	Medium
771. Jewels and Stones	Solution	Easy
777. Swap Adjacent in LR String	Solution	Medium
779. K-th Symbol in Grammar	Solution	Medium
785. Is Graph Bipartite?	Solution	Medium
787. Cheapest Flights Within K Stops	Solution	Medium
790. Domino and Tromino Tiling	Solution	Medium
792. Number of Matching Subsequences	Solution	Medium
797. All Paths From Source to Target	Solution	Medium
783. Minimum Distance Between BST Nodes	Solution	Easy
802. Find Eventual Safe States	Solution	Medium
803. Bricks Falling When Hit	Solution	Hard
804. Unique Morse Code Words	Solution	Easy
807. Max Increase to Keep City Skyline	Solution	Medium
819. Most Common Word	Solution	Easy
826. Most Profit Assigning Work	Solution	Medium
832. Flipping an Image	Solution	Easy
836. Rectangle Overlap	Solution	Easy
841. Keys and Rooms	Solution	Medium
842. Split Array into Fibonacci Sequence	Solution	Medium
843. Guess the Word	Solution	Hard
844. Backspace String Compare	Solution	Easy
845. Longest Mountain in Array	Solution	Medium
846. Hand of Straights	Solution	Medium
849. Maximize Distance to Closest Person	Solution	Easy
850. Rectangle Area II	Solution	Hard
855. Exam Room	Solution	Medium
859. Buddy Strings	Solution	Easy
860. Lemonade Change	Solution	Easy
862. Shortest Subarray with Sum at Least K	Solution	Hard
863. All Nodes Distance K in Binary Tree	Solution	Medium
864. Shortest Path to Get All Keys	Solution	Hard
873. Length of Longest Fibonacci Subsequence	Solution	Medium
875. Koko Eating Bananas	Solution	Easy
876. Middle of the Linked List	Solution	Easy
877. Stone Game	Solution	Medium
879. Profitable Schemes	Solution	Hard
884. Decoded String at Index	Solution	Medium
885. Boats to Save People	Solution	Medium
886. Possible Bipartition	Solution	Medium
887. Projection Area of 3D Shapes	Solution	Easy
890. Find and Replace Pattern	Solution	Medium
895. Maximum Frequency Stack	Solution	Hard
Convert Binary Search Tree to Sorted Doubly Linked List	Solution	-
HighestPopulationYear	Solution	-
Insert into a Cyclic Sorted List	Solution	-
Robot Room Cleaner	Solution	-
AsyncJobMonitor	Solution	-
Bench	Solution	-
FindCenterOfMassInA2DArray	Solution	-
OneEditDistance	Solution	-
CollatzConjecture	Solution	-
Subsequence	Solution	-
TreeToForestByErasingNodes	Solution	-
KMP	Solution	-