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Rank	#	Title	Difficulty	Similar
1	146	LRU Cache	Medium	460. LFU Cache; 588. Design In-Memory File System; 604. Design Compressed String Iterator; 1756. Design Most Recently Used Queue
2	200	Number of Islands	Medium	130. Surrounded Regions; 286. Walls and Gates; 305. Number of Islands II; 323. Number of Connected Components in an Undirected Graph; 419. Battleships in a Board; 694. Number of Distinct Islands; 695. Max Area of Island; 1905. Count Sub Islands; …(+4)
3	432	All O`one Data Structure	Hard
4	787	Cheapest Flights Within K Stops	Medium	568. Maximum Vacation Days; 2093. Minimum Cost to Reach City With Discounts
5	33	Search in Rotated Sorted Array	Medium	81. Search in Rotated Sorted Array II; 153. Find Minimum in Rotated Sorted Array; 2137. Pour Water Between Buckets to Make Water Levels Equal
6	34	Find First and Last Position of Element in Sorted Array	Medium	278. First Bad Version; 2055. Plates Between Candles; 2089. Find Target Indices After Sorting Array
7	56	Merge Intervals	Medium	57. Insert Interval; 252. Meeting Rooms; 253. Meeting Rooms II; 495. Teemo Attacking; 616. Add Bold Tag in String; 715. Range Module; 759. Employee Free Time; 763. Partition Labels; …(+10)
8	78	Subsets	Medium	90. Subsets II; 320. Generalized Abbreviation; 784. Letter Case Permutation; 1982. Find Array Given Subset Sums; 2044. Count Number of Maximum Bitwise-OR Subsets
9	134	Gas Station	Medium	2202. Maximize the Topmost Element After K Moves
10	207	Course Schedule	Medium	210. Course Schedule II; 261. Graph Valid Tree; 310. Minimum Height Trees; 630. Course Schedule III; 2392. Build a Matrix With Conditions
11	437	Path Sum III	Medium	112. Path Sum; 113. Path Sum II; 666. Path Sum IV; 687. Longest Univalue Path
12	845	Longest Mountain in Array	Medium	1671. Minimum Number of Removals to Make Mountain Array; 2100. Find Good Days to Rob the Bank
13	886	Possible Bipartition	Medium
14	974	Subarray Sums Divisible by K	Medium	560. Subarray Sum Equals K; 1590. Make Sum Divisible by P; 2364. Count Number of Bad Pairs; 2575. Find the Divisibility Array of a String; 2845. Count of Interesting Subarrays; 3381. Maximum Subarray Sum With Length Divisible by K
15	1043	Partition Array for Maximum Sum	Medium	2098. Subsequence of Size K With the Largest Even Sum; 2767. Partition String Into Minimum Beautiful Substrings; 3144. Minimum Substring Partition of Equal Character Frequency
16	25	Reverse Nodes in k-Group	Hard	24. Swap Nodes in Pairs; 1721. Swapping Nodes in a Linked List; 2074. Reverse Nodes in Even Length Groups
17	32	Longest Valid Parentheses	Hard	20. Valid Parentheses
18	43	Multiply Strings	Medium	2. Add Two Numbers; 66. Plus One; 67. Add Binary; 415. Add Strings; 2288. Apply Discount to Prices
19	54	Spiral Matrix	Medium	59. Spiral Matrix II; 885. Spiral Matrix III; 2326. Spiral Matrix IV
20	68	Text Justification	Hard	1592. Rearrange Spaces Between Words; 2138. Divide a String Into Groups of Size k; 2468. Split Message Based on Limit
21	79	Word Search	Medium	212. Word Search II
22	121	Best Time to Buy and Sell Stock	Easy	53. Maximum Subarray; 122. Best Time to Buy and Sell Stock II; 123. Best Time to Buy and Sell Stock III; 188. Best Time to Buy and Sell Stock IV; 309. Best Time to Buy and Sell Stock with Cooldown; 2012. Sum of Beauty in the Array; 2016. Maximum Difference Between Increasing Elements; 2291. Maximum Profit From Trading Stocks; …(+1)
23	128	Longest Consecutive Sequence	Medium	298. Binary Tree Longest Consecutive Sequence; 2177. Find Three Consecutive Integers That Sum to a Given Number; 2274. Maximum Consecutive Floors Without Special Floors; 2414. Length of the Longest Alphabetical Continuous Substring; 3020. Find the Maximum Number of Elements in Subset
24	189	Rotate Array	Medium	61. Rotate List; 186. Reverse Words in a String II; 2607. Make K-Subarray Sums Equal; 3400. Maximum Number of Matching Indices After Right Shifts
25	215	Kth Largest Element in an Array	Medium	324. Wiggle Sort II; 347. Top K Frequent Elements; 414. Third Maximum Number; 703. Kth Largest Element in a Stream; 973. K Closest Points to Origin; 1985. Find the Kth Largest Integer in the Array; 2099. Find Subsequence of Length K With the Largest Sum; 2146. K Highest Ranked Items Within a Price Range
26	227	Basic Calculator II	Medium	224. Basic Calculator; 282. Expression Add Operators; 772. Basic Calculator III; 3749. Evaluate Valid Expressions
27	253	Meeting Rooms II	Medium	56. Merge Intervals; 252. Meeting Rooms; 452. Minimum Number of Arrows to Burst Balloons; 1094. Car Pooling; 2251. Number of Flowers in Full Bloom; 2402. Meeting Rooms III; 2462. Total Cost to Hire K Workers; 2848. Points That Intersect With Cars
28	295	Find Median from Data Stream	Hard	480. Sliding Window Median; 1825. Finding MK Average; 2102. Sequentially Ordinal Rank Tracker; 3107. Minimum Operations to Make Median of Array Equal to K; 3422. Minimum Operations to Make Subarray Elements Equal; 3505. Minimum Operations to Make Elements Within K Subarrays Equal
29	297	Serialize and Deserialize Binary Tree	Hard	271. Encode and Decode Strings; 449. Serialize and Deserialize BST; 652. Find Duplicate Subtrees; 428. Serialize and Deserialize N-ary Tree
30	340	Longest Substring with At Most K Distinct Characters	Medium	3. Longest Substring Without Repeating Characters; 159. Longest Substring with At Most Two Distinct Characters; 424. Longest Repeating Character Replacement; 992. Subarrays with K Different Integers; 1004. Max Consecutive Ones III; 2024. Maximize the Confusion of an Exam
31	347	Top K Frequent Elements	Medium	192. Word Frequency; 215. Kth Largest Element in an Array; 451. Sort Characters By Frequency; 659. Split Array into Consecutive Subsequences; 692. Top K Frequent Words; 973. K Closest Points to Origin; 1772. Sort Features by Popularity; 2284. Sender With Largest Word Count; …(+2)
32	394	Decode String	Medium	471. Encode String with Shortest Length; 726. Number of Atoms; 1087. Brace Expansion
33	428	Serialize and Deserialize N-ary Tree	Hard	297. Serialize and Deserialize Binary Tree; 449. Serialize and Deserialize BST; 431. Encode N-ary Tree to Binary Tree
34	438	Find All Anagrams in a String	Medium	242. Valid Anagram; 567. Permutation in String
35	694	Number of Distinct Islands	Medium	200. Number of Islands; 711. Number of Distinct Islands II; 1905. Count Sub Islands
36	706	Design HashMap	Easy	705. Design HashSet; 1206. Design Skiplist
37	904	Fruit Into Baskets	Medium	2401. Longest Nice Subarray; 3477. Fruits Into Baskets II
38	1041	Robot Bounded In Circle	Medium
39	1248	Count Number of Nice Subarrays	Medium	2261. K Divisible Elements Subarrays; 2444. Count Subarrays With Fixed Bounds; 2750. Ways to Split Array Into Good Subarrays; 2845. Count of Interesting Subarrays
40	1352	Product of the Last K Numbers	Medium