LeetCode

My solutions for tasks from LeetCode:

• 1. Two Sum
• 2. Add Two Numbers
• 3. Longest Substring Without Repeating Characters
• 4. Median of Two Sorted Arrays
• 5. Longest Palindromic Substring
• 6. ZigZag Conversion
• 7. Reverse Integer
• 8. String to Integer (atoi)
• 9. Palindrome Number
• 10. Regular Expression Matching
• 11. Container With Most Water
• 12. Integer to Roman
• 13. Roman to Integer
• 14. Longest Common Prefix
• 15. 3Sum
• 16. 3Sum Closest
• 17. Letter Combinations of a Phone Number
• 18. 4Sum
• 19. Remove Nth Node From End of List
• 20. Valid Parentheses
• 21. Merge Two Sorted Lists
• 22. Generate Parentheses
• 23. Merge k Sorted Lists
• 24. Swap Nodes in Pairs
• 25. Reverse Nodes in k-Group
• 26. Remove Duplicates from Sorted Array
• 27. Remove Element
• 28. Implement strStr()
• 29. Divide Two Integers
• 31. Next Permutation
• 32. Longest Valid Parentheses
• 33. Search in Rotated Sorted Array
• 34. Find First and Last Position of Element in Sorted Array
• 35. Search Insert Position
• 36. Valid Sudoku
• 38. Count and Say
• 39. Combination Sum
• 40. Combination Sum II
• 41. First Missing Positive
• 42. Trapping Rain Water
• 43. Multiply Strings
• 45. Jump Game II
• 46. Permutations
• 47. Permutations II
• 48. Rotate Image
• 49. Group Anagrams
• 50. Pow(x, n)
• 51. N-Queens
• 52. N-Queens II
• 53. Maximum Subarray
• 54. Spiral Matrix
• 55. Jump Game
• 56. Merge Intervals
• 57. Insert Interval
• 58. Length of Last Word
• 59. Spiral Matrix II
• 60. Permutation Sequence
• 61. Rotate List
• 62. Unique Paths
• 63. Unique Paths II
• 64. Minimum Path Sum
• 65. Valid Number
• 66. Plus One
• 67. Add Binary
• 68. Text Justification
• 69. Sqrt(x)
• 70. Climbing Stairs
• 71. Simplify Path
• 72. Edit Distance
• 73. Set Matrix Zeroes
• 74. Search a 2D Matrix
• 75. Sort Colors
• 76. Minimum Window Substring
• 77. Combinations
• 78. Subsets
• 79. Word Search
• 80. Remove Duplicates from Sorted Array II
• 81. Search in Rotated Sorted Array II
• 82. Remove Duplicates from Sorted List II
• 83. Remove Duplicates from Sorted List
• 84. Largest Rectangle in Histogram
• 85. Maximal Rectangle
• 86. Partition List
• 87. Scramble String
• 88. Merge Sorted Array
• 89. Gray Code
• 90. Subsets II
• 91. Decode Ways
• 92. Reverse Linked List II
• 93. Restore IP Addresses
• 94. Binary Tree Inorder Traversal
• 95. Unique Binary Search Trees II
• 96. Unique Binary Search Trees
• 97. Interleaving String
• 98. Validate Binary Search Tree
• 99. Recover Binary Search Tree
• 100. Same Tree
• 101. Symmetric Tree
• 102. Binary Tree Level Order Traversal
• 103. Binary Tree Zigzag Level Order Traversal
• 104. Maximum Depth of Binary Tree
• 105. Construct Binary Tree from Preorder and Inorder Traversal
• 106. Construct Binary Tree from Inorder and Postorder Traversal
• 107. Binary Tree Level Order Traversal II
• 108. Convert Sorted Array to Binary Search Tree
• 109. Convert Sorted List to Binary Search Tree
• 110. Balanced Binary Tree
• 111. Minimum Depth of Binary Tree
• 112. Path Sum
• 113. Path Sum II
• 114. Flatten Binary Tree to Linked List
• 115. Distinct Subsequences
• 116. Populating Next Right Pointers in Each Node
• 117. Populating Next Right Pointers in Each Node II
• 118. Pascal's Triangle
• 119. Pascal's Triangle II
• 120. Triangle
• 121. Best Time to Buy and Sell Stock
• 122. Best Time to Buy and Sell Stock II
• 124. Binary Tree Maximum Path Sum
• 125. Valid Palindrome
• 126. Word Ladder II
• 127. Word Ladder
• 128. Longest Consecutive Sequence
• 129. Sum Root to Leaf Numbers
• 130. Surrounded Regions
• 131. Palindrome Partitioning
• 133. Clone Graph
• 134. Gas Station
• 135. Candy
• 136. Single Number
• 137. Single Number II
• 138. Copy List with Random Pointer
• 139. Word Break
• 140. Word Break II
• 141. Linked List Cycle
• 142. Linked List Cycle II
• 143. Reorder List
• 144. Binary Tree Preorder Traversal
• 145. Binary Tree Postorder Traversal
• 146. LRU Cache
• 147. Insertion Sort List
• 148. Sort List
• 149. Max Points on a Line
• 150. Evaluate Reverse Polish Notation
• 151. Reverse Words in a String
• 152. Maximum Product Subarray
• 153. Find Minimum in Rotated Sorted Array
• 155. Min Stack
• 160. Intersection of Two Linked Lists
• 162. Find Peak Element
• 164. Maximum Gap
• 165. Compare Version Numbers
• 166. Fraction to Recurring Decimal
• 167. Two Sum II - Input array is sorted
• 168. Excel Sheet Column Title
• 169. Majority Element
• 171. Excel Sheet Column Number
• 172. Factorial Trailing Zeroes
• 173. Binary Search Tree Iterator
• 179. Largest Number
• 187. Repeated DNA Sequences
• 189. Rotate Array
• 190. Reverse Bits
• 191. Number of 1 Bits
• 198. House Robber
• 199. Binary Tree Right Side View
• 200. Number of Islands
• 201. Bitwise AND of Numbers Range
• 202. Happy Number
• 203. Remove Linked List Elements
• 204. Count Primes
• 205. Isomorphic Strings
• 206. Reverse Linked List
• 207. Course Schedule
• 208. Implement Trie (Prefix Tree)
• 209. Minimum Size Subarray Sum
• 210. Course Schedule II
• 211. Design Add and Search Words Data Structure
• 213. House Robber II
• 214. Shortest Palindrome
• 215. Kth Largest Element in an Array
• 216. Combination Sum III
• 217. Contains Duplicate
• 219. Contains Duplicate II
• 221. Maximal Square
• 222. Count Complete Tree Nodes
• 223. Rectangle Area
• 224. Basic Calculator
• 225. Implement Stack using Queues
• 226. Invert Binary Tree
• 227. Basic Calculator II
• 228. Summary Ranges
• 229. Majority Element II
• 230. Kth Smallest Element in a BST
• 231. Power of Two
• 232. Implement Queue using Stacks
• 233. Number of Digit One
• 234. Palindrome Linked List
• 235. Lowest Common Ancestor of a Binary Search Tree
• 236. Lowest Common Ancestor of a Binary Tree
• 237. Delete Node in a Linked List
• 238. Product of Array Except Self
• 239. Sliding Window Maximum
• 240. Search a 2D Matrix II
• 241. Different Ways to Add Parentheses
• 242. Valid Anagram
• 257. Binary Tree Paths
• 258. Add Digits
• 260. Single Number III
• 263. Ugly Number
• 264. Ugly Number II
• 268. Missing Number
• 273. Integer to English Words
• 274. H-Index
• 275. H-Index II
• 278. First Bad Version
• 279. Perfect Squares
• 282. Expression Add Operators
• 283. Move Zeroes
• 284. Peeking Iterator
• 287. Find the Duplicate Number
• 289. Game of Life
• 290. Word Pattern
• 292. Nim Game
• 295. Find Median from Data Stream
• 297. Serialize and Deserialize Binary Tree
• 299. Bulls and Cows
• 300. Longest Increasing Subsequence
• 303. Range Sum Query - Immutable
• 304. Range Sum Query 2D - Immutable
• 306. Additive Number
• 307. Range Sum Query - Mutable
• 309. Best Time to Buy and Sell Stock with Cooldown
• 310. Minimum Height Trees
• 313. Super Ugly Number
• 316. Remove Duplicate Letters
• 318. Maximum Product of Word Lengths
• 319. Bulb Switcher
• 322. Coin Change
• 326. Power of Three
• 328. Odd Even Linked List
• 329. Longest Increasing Path in a Matrix
• 330. Patching Array
• 331. Verify Preorder Serialization of a Binary Tree
• 332. Reconstruct Itinerary
• 334. Increasing Triplet Subsequence
• 337. House Robber III
• 338. Counting Bits
• 341. Flatten Nested List Iterator
• 342. Power of Four
• 343. Integer Break
• 344. Reverse String
• 345. Reverse Vowels of a String
• 347. Top K Frequent Elements
• 349. Intersection of Two Arrays
• 350. Intersection of Two Arrays II
• 352. Data Stream as Disjoint Intervals
• 354. Russian Doll Envelopes
• 355. Design Twitter
• 357. Count Numbers with Unique Digits
• 363. Max Sum of Rectangle No Larger Than K
• 367. Valid Perfect Square
• 368. Largest Divisible Subset
• 371. Sum of Two Integers
• 372. Super Pow
• 373. Find K Pairs with Smallest Sums
• 374. Guess Number Higher or Lower
• 376. Wiggle Subsequence
• 377. Combination Sum IV
• 378. Kth Smallest Element in a Sorted Matrix
• 380. Insert Delete GetRandom O(1)
• 381. Insert Delete GetRandom O(1) - Duplicates allowed
• 382. Linked List Random Node
• 383. Ransom Note
• 384. Shuffle an Array
• 385. Mini Parser
• 386. Lexicographical Numbers
• 387. First Unique Character in a String
• 388. Longest Absolute File Path
• 389. Find the Difference
• 390. Elimination Game
• 392. Is Subsequence
• 393. UTF-8 Validation
• 394. Decode String
• 396. Rotate Function
• 397. Integer Replacement
• 398. Random Pick Index
• 399. Evaluate Division
• 400. Nth Digit
• 401. Binary Watch
• 402. Remove K Digits
• 403. Frog Jump
• 404. Sum of Left Leaves
• 405. Convert a Number to Hexadecimal
• 406. Queue Reconstruction by Height
• 409. Longest Palindrome
• 410. Split Array Largest Sum
• 412. Fizz Buzz
• 413. Arithmetic Slices
• 414. Third Maximum Number
• 415. Add Strings
• 416. Partition Equal Subset Sum
• 417. Pacific Atlantic Water Flow
• 419. Battleships in a Board
• 421. Maximum XOR of Two Numbers in an Array
• 423. Reconstruct Original Digits from English
• 424. Longest Repeating Character Replacement
• 427. Construct Quad Tree
• 429. N-ary Tree Level Order Traversal
• 430. Flatten a Multilevel Doubly Linked List
• 432. All O`one Data Structure
• 433. Minimum Genetic Mutation
• 434. Number of Segments in a String
• 435. Non-overlapping Intervals
• 436. Find Right Interval
• 437. Path Sum III
• 438. Find All Anagrams in a String
• 441. Arranging Coins
• 442. Find All Duplicates in an Array
• 443. String Compression
• 445. Add Two Numbers II
• 446. Arithmetic Slices II - Subsequence
• 447. Number of Boomerangs
• 448. Find All Numbers Disappeared in an Array
• 449. Serialize and Deserialize BST
• 450. Delete Node in a BST
• 451. Sort Characters By Frequency
• 452. Minimum Number of Arrows to Burst Balloons
• 454. 4Sum II
• 455. Assign Cookies
• 456. 132 Pattern
• 457. Circular Array Loop
• 459. Repeated Substring Pattern
• 460. LFU Cache
• 461. Hamming Distance
• 462. Minimum Moves to Equal Array Elements II
• 463. Island Perimeter
• 467. Unique Substrings in Wraparound String
• 468. Validate IP Address
• 470. Implement Rand10() Using Rand7()
• 473. Matchsticks to Square
• 474. Ones and Zeroes
• 475. Heaters
• 476. Number Complement
• 477. Total Hamming Distance
• 478. Generate Random Point in a Circle
• 480. Sliding Window Median
• 482. License Key Formatting
• 485. Max Consecutive Ones
• 486. Predict the Winner
• 491. Increasing Subsequences
• 492. Construct the Rectangle
• 494. Target Sum
• 495. Teemo Attacking
• 496. Next Greater Element I
• 498. Diagonal Traverse
• 500. Keyboard Row
• 501. Find Mode in Binary Search Tree
• 502. IPO
• 503. Next Greater Element II
• 504. Base 7
• 506. Relative Ranks
• 507. Perfect Number
• 508. Most Frequent Subtree Sum
• 509. Fibonacci Number
• 513. Find Bottom Left Tree Value
• 514. Freedom Trail
• 515. Find Largest Value in Each Tree Row
• 516. Longest Palindromic Subsequence
• 518. Coin Change 2
• 519. Random Flip Matrix
• 520. Detect Capital
• 521. Longest Uncommon Subsequence I
• 522. Longest Uncommon Subsequence II
• 523. Continuous Subarray Sum
• 524. Longest Word in Dictionary through Deleting
• 525. Contiguous Array
• 526. Beautiful Arrangement
• 528. Random Pick with Weight
• 529. Minesweeper
• 530. Minimum Absolute Difference in BST
• 532. K-diff Pairs in an Array
• 535. Encode and Decode TinyURL
• 537. Complex Number Multiplication
• 538. Convert BST to Greater Tree
• 539. Minimum Time Difference
• 540. Single Element in a Sorted Array
• 541. Reverse String II
• 542. 01 Matrix
• 543. Diameter of Binary Tree
• 547. Friend Circles
• 551. Student Attendance Record I
• 552. Student Attendance Record II
• 553. Optimal Division
• 554. Brick Wall
• 556. Next Greater Element III
• 557. Reverse Words in a String III
• 560. Subarray Sum Equals K
• 561. Array Partition I
• 563. Binary Tree Tilt
• 564. Find the Closest Palindrome
• 565. Array Nesting
• 566. Reshape the Matrix
• 567. Permutation in String
• 572. Subtree of Another Tree
• 576. Out of Boundary Paths
• 581. Shortest Unsorted Continuous Subarray
• 583. Delete Operation for Two Strings
• 590. N-ary Tree Postorder Traversal
• 591. Tag Validator
• 592. Fraction Addition and Subtraction
• 593. Valid Square
• 594. Longest Harmonious Subsequence
• 598. Range Addition II
• 599. Minimum Index Sum of Two Lists
• 605. Can Place Flowers
• 606. Construct String from Binary Tree
• 609. Find Duplicate File in System
• 611. Valid Triangle Number
• 621. Task Scheduler
• 622. Design Circular Queue
• 623. Add One Row to Tree
• 624. Maximum Distance in Arrays
• 628. Maximum Product of Three Numbers
• 629. K Inverse Pairs Array
• 630. Course Schedule III
• 632. Smallest Range Covering Elements from K Lists
• 633. Sum of Square Numbers
• 636. Exclusive Time of Functions
• 637. Average of Levels in Binary Tree
• 639. Decode Ways II
• 640. Solve the Equation
• 641. Design Circular Deque
• 643. Maximum Average Subarray I
• 645. Set Mismatch
• 646. Maximum Length of Pair Chain
• 647. Palindromic Substrings
• 648. Replace Words
• 649. Dota2 Senate
• 650. 2 Keys Keyboard
• 652. Find Duplicate Subtrees
• 653. Two Sum IV - Input is a BST
• 654. Maximum Binary Tree
• 655. Print Binary Tree
• 657. Robot Return to Origin
• 658. Find K Closest Elements
• 659. Split Array into Consecutive Subsequences
• 661. Image Smoother
• 662. Maximum Width of Binary Tree
• 664. Strange Printer
• 665. Non-decreasing Array
• 667. Beautiful Arrangement II
• 669. Trim a Binary Search Tree
• 670. Maximum Swap
• 672. Bulb Switcher II
• 673. Number of Longest Increasing Subsequence
• 674. Longest Continuous Increasing Subsequence
• 676. Implement Magic Dictionary
• 677. Map Sum Pairs
• 678. Valid Parenthesis String
• 679. 24 Game
• 680. Valid Palindrome II
• 682. Baseball Game
• 684. Redundant Connection
• 686. Repeated String Match
• 687. Longest Univalue Path
• 688. Knight Probability in Chessboard
• 690. Employee Importance
• 692. Top K Frequent Words
• 695. Max Area of Island
• 696. Count Binary Substrings
• 698. Partition to K Equal Sum Subsets
• 700. Search in a Binary Search Tree
• 701. Insert into a Binary Search Tree
• 703. Kth Largest Element in a Stream
• 704. Binary Search
• 705. Design HashSet
• 706. Design HashMap
• 707. Design Linked List
• 709. To Lower Case
• 710. Random Pick with Blacklist
• 712. Minimum ASCII Delete Sum for Two Strings
• 713. Subarray Product Less Than K
• 715. Range Module
• 717. 1-bit and 2-bit Characters
• 718. Maximum Length of Repeated Subarray
• 719. Find K-th Smallest Pair Distance
• 720. Longest Word in Dictionary
• 721. Accounts Merge
• 722. Remove Comments
• 725. Split Linked List in Parts
• 726. Number of Atoms
• 728. Self Dividing Numbers
• 729. My Calendar I
• 731. My Calendar II
• 732. My Calendar III
• 735. Asteroid Collision
• 736. Parse Lisp Expression
• 738. Monotone Increasing Digits
• 739. Daily Temperatures
• 740. Delete and Earn
• 743. Network Delay Time
• 744. Find Smallest Letter Greater Than Target
• 745. Prefix and Suffix Search
• 746. Min Cost Climbing Stairs
• 747. Largest Number At Least Twice of Others
• 748. Shortest Completing Word
• 752. Open the Lock
• 754. Reach a Number
• 762. Prime Number of Set Bits in Binary Representation
• 763. Partition Labels
• 764. Largest Plus Sign
• 766. Toeplitz Matrix
• 767. Reorganize String
• 768. Max Chunks To Make Sorted II
• 769. Max Chunks To Make Sorted
• 771. Jewels and Stones
• 773. Sliding Puzzle
• 775. Global and Local Inversions
• 779. K-th Symbol in Grammar
• 783. Minimum Distance Between BST Nodes
• 784. Letter Case Permutation
• 785. Is Graph Bipartite?
• 786. K-th Smallest Prime Fraction
• 787. Cheapest Flights Within K Stops
• 788. Rotated Digits
• 789. Escape The Ghosts
• 790. Domino and Tromino Tiling
• 791. Custom Sort String
• 792. Number of Matching Subsequences
• 793. Preimage Size of Factorial Zeroes Function
• 794. Valid Tic-Tac-Toe State
• 795. Number of Subarrays with Bounded Maximum
• 796. Rotate String
• 797. All Paths From Source to Target
• 799. Champagne Tower
• 802. Find Eventual Safe States
• 804. Unique Morse Code Words
• 806. Number of Lines To Write String
• 807. Max Increase to Keep City Skyline
• 808. Soup Servings
• 809. Expressive Words
• 811. Subdomain Visit Count
• 812. Largest Triangle Area
• 813. Largest Sum of Averages
• 814. Binary Tree Pruning
• 815. Bus Routes
• 816. Ambiguous Coordinates
• 817. Linked List Components
• 819. Most Common Word
• 820. Short Encoding of Words
• 821. Shortest Distance to a Character
• 822. Card Flipping Game
• 823. Binary Trees With Factors
• 824. Goat Latin
• 825. Friends Of Appropriate Ages
• 826. Most Profit Assigning Work
• 827. Making A Large Island
• 829. Consecutive Numbers Sum
• 830. Positions of Large Groups
• 831. Masking Personal Information
• 832. Flipping an Image
• 833. Find And Replace in String
• 834. Sum of Distances in Tree
• 835. Image Overlap
• 837. New 21 Game
• 838. Push Dominoes
• 839. Similar String Groups
• 840. Magic Squares In Grid
• 841. Keys and Rooms
• 842. Split Array into Fibonacci Sequence
• 843. Guess the Word
• 844. Backspace String Compare
• 845. Longest Mountain in Array
• 846. Hand of Straights
• 847. Shortest Path Visiting All Nodes
• 848. Shifting Letters
• 849. Maximize Distance to Closest Person
• 852. Peak Index in a Mountain Array
• 853. Car Fleet
• 856. Score of Parentheses
• 859. Buddy Strings
• 860. Lemonade Change
• 861. Score After Flipping Matrix
• 863. All Nodes Distance K in Binary Tree
• 865. Smallest Subtree with all the Deepest Nodes
• 866. Prime Palindrome
• 867. Transpose Matrix
• 868. Binary Gap
• 869. Reordered Power of 2
• 870. Advantage Shuffle
• 872. Leaf-Similar Trees
• 873. Length of Longest Fibonacci Subsequence
• 874. Walking Robot Simulation
• 875. Koko Eating Bananas
• 876. Middle of the Linked List
• 877. Stone Game
• 878. Nth Magical Number
• 879. Profitable Schemes
• 880. Decoded String at Index
• 881. Boats to Save People
• 883. Projection Area of 3D Shapes
• 884. Uncommon Words from Two Sentences
• 885. Spiral Matrix III
• 886. Possible Bipartition
• 889. Construct Binary Tree from Preorder and Postorder Traversal
• 890. Find and Replace Pattern
• 892. Surface Area of 3D Shapes
• 893. Groups of Special-Equivalent Strings
• 894. All Possible Full Binary Trees
• 895. Maximum Frequency Stack
• 896. Monotonic Array
• 897. Increasing Order Search Tree
• 898. Bitwise ORs of Subarrays
• 900. RLE Iterator
• 901. Online Stock Span
• 902. Numbers At Most N Given Digit Set
• 904. Fruit Into Baskets
• 905. Sort Array By Parity
• 907. Sum of Subarray Minimums
• 909. Snakes and Ladders
• 911. Online Election
• 912. Sort an Array
• 915. Partition Array into Disjoint Intervals
• 916. Word Subsets
• 917. Reverse Only Letters
• 918. Maximum Sum Circular Subarray
• 919. Complete Binary Tree Inserter
• 921. Minimum Add to Make Parentheses Valid
• 922. Sort Array By Parity II
• 923. 3Sum With Multiplicity
• 924. Minimize Malware Spread
• 925. Long Pressed Name
• 926. Flip String to Monotone Increasing
• 927. Three Equal Parts
• 928. Minimize Malware Spread II
• 929. Unique Email Addresses
• 930. Binary Subarrays With Sum
• 931. Minimum Falling Path Sum
• 934. Shortest Bridge
• 935. Knight Dialer
• 937. Reorder Data in Log Files
• 938. Range Sum of BST
• 939. Minimum Area Rectangle
• 941. Valid Mountain Array
• 942. DI String Match
• 944. Delete Columns to Make Sorted
• 945. Minimum Increment to Make Array Unique
• 946. Validate Stack Sequences
• 947. Most Stones Removed with Same Row or Column
• 948. Bag of Tokens
• 949. Largest Time for Given Digits
• 950. Reveal Cards In Increasing Order
• 951. Flip Equivalent Binary Trees
• 953. Verifying an Alien Dictionary
• 954. Array of Doubled Pairs
• 955. Delete Columns to Make Sorted II
• 957. Prison Cells After N Days
• 958. Check Completeness of a Binary Tree
• 959. Regions Cut By Slashes
• 962. Maximum Width Ramp
• 963. Minimum Area Rectangle II
• 965. Univalued Binary Tree
• 966. Vowel Spellchecker
• 967. Numbers With Same Consecutive Differences
• 968. Binary Tree Cameras
• 969. Pancake Sorting
• 970. Powerful Integers
• 971. Flip Binary Tree To Match Preorder Traversal
• 972. Equal Rational Numbers
• 973. K Closest Points to Origin
• 974. Subarray Sums Divisible by K
• 976. Largest Perimeter Triangle
• 977. Squares of a Sorted Array
• 978. Longest Turbulent Subarray
• 979. Distribute Coins in Binary Tree
• 980. Unique Paths III
• 981. Time Based Key-Value Store
• 982. Triples with Bitwise AND Equal To Zero
• 983. Minimum Cost For Tickets
• 984. String Without AAA or BBB
• 985. Sum of Even Numbers After Queries
• 986. Interval List Intersections
• 987. Vertical Order Traversal of a Binary Tree
• 988. Smallest String Starting From Leaf
• 989. Add to Array-Form of Integer
• 990. Satisfiability of Equality Equations
• 991. Broken Calculator
• 992. Subarrays with K Different Integers
• 993. Cousins in Binary Tree
• 994. Rotting Oranges
• 995. Minimum Number of K Consecutive Bit Flips
• 997. Find the Town Judge
• 998. Maximum Binary Tree II
• 999. Available Captures for Rook
• 1001. Grid Illumination
• 1002. Find Common Characters
• 1003. Check If Word Is Valid After Substitutions
• 1004. Max Consecutive Ones III
• 1006. Clumsy Factorial
• 1007. Minimum Domino Rotations For Equal Row
• 1008. Construct Binary Search Tree from Preorder Traversal
• 1009. Complement of Base 10 Integer
• 1010. Pairs of Songs With Total Durations Divisible by 60
• 1011. Capacity To Ship Packages Within D Days
• 1014. Best Sightseeing Pair
• 1015. Smallest Integer Divisible by K
• 1016. Binary String With Substrings Representing 1 To N
• 1017. Convert to Base -2
• 1018. Binary Prefix Divisible By 5
• 1019. Next Greater Node In Linked List
• 1020. Number of Enclaves
• 1021. Remove Outermost Parentheses
• 1022. Sum of Root To Leaf Binary Numbers
• 1023. Camelcase Matching
• 1024. Video Stitching
• 1026. Maximum Difference Between Node and Ancestor
• 1027. Longest Arithmetic Subsequence
• 1028. Recover a Tree From Preorder Traversal
• 1029. Two City Scheduling
• 1030. Matrix Cells in Distance Order
• 1031. Maximum Sum of Two Non-Overlapping Subarrays
• 1032. Stream of Characters
• 1033. Moving Stones Until Consecutive
• 1034. Coloring A Border
• 1035. Uncrossed Lines
• 1038. Binary Search Tree to Greater Sum Tree
• 1041. Robot Bounded In Circle
• 1042. Flower Planting With No Adjacent
• 1043. Partition Array for Maximum Sum
• 1046. Last Stone Weight
• 1047. Remove All Adjacent Duplicates In String
• 1048. Longest String Chain
• 1051. Height Checker
• 1052. Grumpy Bookstore Owner
• 1053. Previous Permutation With One Swap
• 1054. Distant Barcodes
• 1061. Lexicographically Smallest Equivalent String
• 1071. Greatest Common Divisor of Strings
• 1073. Adding Two Negabinary Numbers
• 1074. Number of Submatrices That Sum to Target
• 1078. Occurrences After Bigram
• 1079. Letter Tile Possibilities
• 1080. Insufficient Nodes in Root to Leaf Paths
• 1081. Smallest Subsequence of Distinct Characters
• 1089. Duplicate Zeros
• 1090. Largest Values From Labels
• 1091. Shortest Path in Binary Matrix
• 1093. Statistics from a Large Sample
• 1094. Car Pooling
• 1095. Find in Mountain Array
• 1104. Path In Zigzag Labelled Binary Tree
• 1105. Filling Bookcase Shelves
• 1106. Parsing A Boolean Expression
• 1108. Defanging an IP Address
• 1109. Corporate Flight Bookings
• 1110. Delete Nodes And Return Forest
• 1122. Relative Sort Array
• 1123. Lowest Common Ancestor of Deepest Leaves
• 1124. Longest Well-Performing Interval
• 1125. Smallest Sufficient Team
• 1128. Number of Equivalent Domino Pairs
• 1129. Shortest Path with Alternating Colors
• 1137. N-th Tribonacci Number
• 1138. Alphabet Board Path
• 1140. Stone Game II
• 1143. Longest Common Subsequence
• 1144. Decrease Elements To Make Array Zigzag
• 1145. Binary Tree Coloring Game
• 1146. Snapshot Array
• 1154. Day of the Year
• 1155. Number of Dice Rolls With Target Sum
• 1156. Swap For Longest Repeated Character Substring
• 1160. Find Words That Can Be Formed by Characters
• 1161. Maximum Level Sum of a Binary Tree
• 1162. As Far from Land as Possible
• 1169. Invalid Transactions
• 1170. Compare Strings by Frequency of the Smallest Character
• 1171. Remove Zero Sum Consecutive Nodes from Linked List
• 1172. Dinner Plate Stacks
• 1175. Prime Arrangements
• 1177. Can Make Palindrome from Substring
• 1185. Day of the Week
• 1189. Maximum Number of Balloons
• 1190. Reverse Substrings Between Each Pair of Parentheses
• 1192. Critical Connections in a Network
• 1200. Minimum Absolute Difference
• 1201. Ugly Number III
• 1202. Smallest String With Swaps
• 1207. Unique Number of Occurrences
• 1208. Get Equal Substrings Within Budget
• 1209. Remove All Adjacent Duplicates in String II
• 1217. Minimum Cost to Move Chips to The Same Position
• 1218. Longest Arithmetic Subsequence of Given Difference
• 1219. Path with Maximum Gold
• 1220. Count Vowels Permutation
• 1222. Queens That Can Attack the King
• 1232. Check If It Is a Straight Line
• 1233. Remove Sub-Folders from the Filesystem
• 1235. Maximum Profit in Job Scheduling
• 1237. Find Positive Integer Solution for a Given Equation
• 1238. Circular Permutation in Binary Representation
• 1239. Maximum Length of a Concatenated String with Unique Characters
• 1247. Minimum Swaps to Make Strings Equal
• 1248. Count Number of Nice Subarrays
• 1249. Minimum Remove to Make Valid Parentheses
• 1253. Reconstruct a 2-Row Binary Matrix
• 1254. Number of Closed Islands
• 1255. Maximum Score Words Formed by Letters
• 1260. Shift 2D Grid
• 1261. Find Elements in a Contaminated Binary Tree
• 1266. Minimum Time Visiting All Points
• 1267. Count Servers that Communicate
• 1268. Search Suggestions System
• 1269. Number of Ways to Stay in the Same Place After Some Steps
• 1275. Find Winner on a Tic Tac Toe Game
• 1276. Number of Burgers with No Waste of Ingredients
• 1277. Count Square Submatrices with All Ones
• 1281. Subtract the Product and Sum of Digits of an Integer
• 1282. Group the People Given the Group Size They Belong To
• 1283. Find the Smallest Divisor Given a Threshold
• 1286. Iterator for Combination
• 1287. Element Appearing More Than 25% In Sorted Array
• 1288. Remove Covered Intervals
• 1289. Minimum Falling Path Sum II
• 1290. Convert Binary Number in a Linked List to Integer
• 1291. Sequential Digits
• 1292. Maximum Side Length of a Square with Sum Less than or Equal to Threshold
• 1293. Shortest Path in a Grid with Obstacles Elimination
• 1296. Divide Array in Sets of K Consecutive Numbers
• 1297. Maximum Number of Occurrences of a Substring
• 1300. Sum of Mutated Array Closest to Target
• 1302. Deepest Leaves Sum
• 1304. Find N Unique Integers Sum up to Zero
• 1305. All Elements in Two Binary Search Trees
• 1306. Jump Game III
• 1307. Verbal Arithmetic Puzzle
• 1309. Decrypt String from Alphabet to Integer Mapping
• 1310. XOR Queries of a Subarray
• 1311. Get Watched Videos by Your Friends
• 1312. Minimum Insertion Steps to Make a String Palindrome
• 1314. Matrix Block Sum
• 1315. Sum of Nodes with Even-Valued Grandparent
• 1318. Minimum Flips to Make a OR b Equal to c
• 1319. Number of Operations to Make Network Connected
• 1320. Minimum Distance to Type a Word Using Two Fingers
• 1323. Maximum 69 Number
• 1324. Print Words Vertically
• 1325. Delete Leaves With a Given Value
• 1328. Break a Palindrome
• 1329. Sort the Matrix Diagonally
• 1331. Rank Transform of an Array
• 1332. Remove Palindromic Subsequences
• 1333. Filter Restaurants by Vegan-Friendly, Price and Distance
• 1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance
• 1335. Minimum Difficulty of a Job Schedule
• 1337. The K Weakest Rows in a Matrix
• 1338. Reduce Array Size to The Half
• 1339. Maximum Product of Splitted Binary Tree
• 1342. Number of Steps to Reduce a Number to Zero
• 1343. Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold
• 1344. Angle Between Hands of a Clock
• 1345. Jump Game IV
• 1347. Minimum Number of Steps to Make Two Strings Anagram
• 1348. Tweet Counts Per Frequency
• 1351. Count Negative Numbers in a Sorted Matrix
• 1352. Product of the Last K Numbers
• 1356. Sort Integers by The Number of 1 Bits
• 1357. Apply Discount Every n Orders
• 1358. Number of Substrings Containing All Three Characters
• 1359. Count All Valid Pickup and Delivery Options
• 1360. Number of Days Between Two Dates
• 1361. Validate Binary Tree Nodes
• 1362. Closest Divisors
• 1363. Largest Multiple of Three
• 1366. Rank Teams by Votes
• 1367. Linked List in Binary Tree
• 1371. Find the Longest Substring Containing Vowels in Even Counts
• 1372. Longest ZigZag Path in a Binary Tree
• 1374. Generate a String With Characters That Have Odd Counts
• 1375. Bulb Switcher III
• 1376. Time Needed to Inform All Employees
• 1379. Find a Corresponding Node of a Binary Tree in a Clone of That Tree
• 1380. Lucky Numbers in a Matrix
• 1381. Design a Stack With Increment Operation
• 1382. Balance a Binary Search Tree
• 1383. Maximum Performance of a Team
• 1386. Cinema Seat Allocation
• 1387. Sort Integers by The Power Value
• 1390. Four Divisors
• 1391. Check if There is a Valid Path in a Grid
• 1392. Longest Happy Prefix
• 1395. Count Number of Teams
• 1396. Design Underground System
• 1400. Construct K Palindrome Strings
• 1401. Circle and Rectangle Overlapping
• 1402. Reducing Dishes
• 1404. Number of Steps to Reduce a Number in Binary Representation to One
• 1405. Longest Happy String
• 1410. HTML Entity Parser
• 1413. Minimum Value to Get Positive Step by Step Sum
• 1414. Find the Minimum Number of Fibonacci Numbers Whose Sum Is K
• 1415. The k-th Lexicographical String of All Happy Strings of Length n
• 1416. Restore The Array
• 1417. Reformat The String
• 1418. Display Table of Food Orders in a Restaurant
• 1419. Minimum Number of Frogs Croaking
• 1420. Build Array Where You Can Find The Maximum Exactly K Comparisons
• 1422. Maximum Score After Splitting a String
• 1423. Maximum Points You Can Obtain from Cards
• 1424. Diagonal Traverse II
• 1431. Kids With the Greatest Number of Candies
• 1432. Max Difference You Can Get From Changing an Integer
• 1433. Check If a String Can Break Another String
• 1436. Destination City
• 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit
• 1441. Build an Array With Stack Operations
• 1442. Count Triplets That Can Form Two Arrays of Equal XOR
• 1443. Minimum Time to Collect All Apples in a Tree
• 1446. Consecutive Characters
• 1447. Simplified Fractions
• 1448. Count Good Nodes in Binary Tree
• 1451. Rearrange Words in a Sentence
• 1452. People Whose List of Favorite Companies Is Not a Subset of Another List
• 1456. Maximum Number of Vowels in a Substring of Given Length
• 1457. Pseudo-Palindromic Paths in a Binary Tree
• 1458. Max Dot Product of Two Subsequences
• 1460. Make Two Arrays Equal by Reversing Subarrays
• 1461. Check If a String Contains All Binary Codes of Size K
• 1463. Cherry Pickup II
• 1464. Maximum Product of Two Elements in an Array
• 1465. Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts
• 1466. Reorder Routes to Make All Paths Lead to the City Zero
• 1470. Shuffle the Array
• 1471. The k Strongest Values in an Array
• 1472. Design Browser History
• 1476. Subrectangle Queries
• 1477. Find Two Non-overlapping Sub-arrays Each With Target Sum
• 1480. Running Sum of 1d Array
• 1481. Least Number of Unique Integers after K Removals
• 1482. Minimum Number of Days to Make m Bouquets
• 1487. Making File Names Unique
• 1488. Avoid Flood in The City
• 1491. Average Salary Excluding the Minimum and Maximum Salary
• 1492. The kth Factor of n
• 1493. Longest Subarray of 1's After Deleting One Element
• 1496. Path Crossing
• 1497. Check If Array Pairs Are Divisible by k
• 1498. Number of Subsequences That Satisfy the Given Sum Condition
• 1502. Can Make Arithmetic Progression From Sequence
• 1503. Last Moment Before All Ants Fall Out of a Plank
• 1504. Count Submatrices With All Ones
• 1507. Reformat Date
• 1508. Range Sum of Sorted Subarray Sums
• 1509. Minimum Difference Between Largest and Smallest Value in Three Moves
• 1510. Stone Game IV
• 1512. Number of Good Pairs
• 1513. Number of Substrings With Only 1s
• 1514. Path with Maximum Probability
• 1518. Water Bottles
• 1519. Number of Nodes in the Sub-Tree With the Same Label
• 1523. Count Odd Numbers in an Interval Range
• 1524. Number of Sub-arrays With Odd Sum
• 1525. Number of Good Ways to Split a String
• 1528. Shuffle String
• 1529. Bulb Switcher IV
• 1530. Number of Good Leaf Nodes Pairs
• 1531. String Compression II
• 1534. Count Good Triplets
• 1535. Find the Winner of an Array Game
• 1536. Minimum Swaps to Arrange a Binary Grid
• 1539. Kth Missing Positive Number
• 1540. Can Convert String in K Moves
• 1541. Minimum Insertions to Balance a Parentheses String
• 1544. Make The String Great
• 1545. Find Kth Bit in Nth Binary String
• 1550. Three Consecutive Odds
• 1552. Magnetic Force Between Two Balls
• 1557. Minimum Number of Vertices to Reach All Nodes
• 1559. Detect Cycles in 2D Grid
• 1561. Maximum Number of Coins You Can Get
• 1562. Find Latest Group of Size M
• 1568. Minimum Number of Days to Disconnect Island
• 1572. Matrix Diagonal Sum
• 1573. Number of Ways to Split a String
• 1574. Shortest Subarray to be Removed to Make Array Sorted
• 1575. Count All Possible Routes
• 1577. Number of Ways Where Square of Number Is Equal to Product of Two Numbers
• 1578. Minimum Time to Make Rope Colorful
• 1579. Remove Max Number of Edges to Keep Graph Fully Traversable
• 1582. Special Positions in a Binary Matrix
• 1584. Min Cost to Connect All Points
• 1590. Make Sum Divisible by P
• 1593. Split a String Into the Max Number of Unique Substrings
• 1594. Maximum Non Negative Product in a Matrix
• 1598. Crawler Log Folder
• 1600. Throne Inheritance
• 1601. Maximum Number of Achievable Transfer Requests
• 1603. Design Parking System
• 1604. Alert Using Same Key-Card Three or More Times in a One Hour Period
• 1605. Find Valid Matrix Given Row and Column Sums
• 1608. Special Array With X Elements Greater Than or Equal X
• 1609. Even Odd Tree
• 1611. Minimum One Bit Operations to Make Integers Zero
• 1614. Maximum Nesting Depth of the Parentheses
• 1615. Maximal Network Rank
• 1616. Split Two Strings to Make Palindrome
• 1624. Largest Substring Between Two Equal Characters
• 1626. Best Team With No Conflicts
• 1629. Slowest Key
• 1630. Arithmetic Subarrays
• 1631. Path With Minimum Effort
• 1636. Sort Array by Increasing Frequency
• 1637. Widest Vertical Area Between Two Points Containing No Points
• 1639. Number of Ways to Form a Target String Given a Dictionary
• 1641. Count Sorted Vowel Strings
• 1642. Furthest Building You Can Reach
• 1643. Kth Smallest Instructions
• 1646. Get Maximum in Generated Array
• 1647. Minimum Deletions to Make Character Frequencies Unique
• 1648. Sell Diminishing-Valued Colored Balls
• 1652. Defuse the Bomb
• 1653. Minimum Deletions to Make String Balanced
• 1657. Determine if Two Strings Are Close
• 1658. Minimum Operations to Reduce X to Zero
• 1662. Check If Two String Arrays are Equivalent
• 1663. Smallest String With A Given Numeric Value
• 1664. Ways to Make a Fair Array
• 1669. Merge In Between Linked Lists
• 1670. Design Front Middle Back Queue
• 1672. Richest Customer Wealth
• 1675. Minimize Deviation in Array
• 1678. Goal Parser Interpretation
• 1679. Max Number of K-Sum Pairs
• 1680. Concatenation of Consecutive Binary Numbers
• 1684. Count the Number of Consistent Strings
• 1685. Sum of Absolute Differences in a Sorted Array
• 1688. Count of Matches in Tournament
• 1689. Partitioning Into Minimum Number Of Deci-Binary Numbers
• 1694. Reformat Phone Number
• 1695. Maximum Erasure Value
• 1696. Jump Game VI
• 1697. Checking Existence of Edge Length Limited Paths
• 1700. Number of Students Unable to Eat Lunch
• 1701. Average Waiting Time
• 1704. Determine if String Halves Are Alike
• 1706. Where Will the Ball Fall
• 1710. Maximum Units on a Truck
• 1711. Count Good Meals
• 1716. Calculate Money in Leetcode Bank
• 1717. Maximum Score From Removing Substrings
• 1720. Decode XORed Array
• 1721. Swapping Nodes in a Linked List
• 1726. Tuple with Same Product
• 1727. Largest Submatrix With Rearrangements
• 1732. Find the Highest Altitude
• 1738. Find Kth Largest XOR Coordinate Value
• 1743. Restore the Array From Adjacent Pairs
• 1750. Minimum Length of String After Deleting Similar Ends
• 1751. Maximum Number of Events That Can Be Attended II
• 1758. Minimum Changes To Make Alternating Binary String
• 1759. Count Number of Homogenous Substrings
• 1764. Form Array by Concatenating Subarrays of Another Array
• 1765. Map of Highest Peak
• 1768. Merge Strings Alternately
• 1769. Minimum Number of Operations to Move All Balls to Each Box
• 1770. Maximum Score from Performing Multiplication Operations
• 1773. Count Items Matching a Rule
• 1779. Find Nearest Point That Has the Same X or Y Coordinate
• 1780. Check if Number is a Sum of Powers of Three
• 1781. Sum of Beauty of All Substrings
• 1784. Check if Binary String Has at Most One Segment of Ones
• 1785. Minimum Elements to Add to Form a Given Sum
• 1790. Check if One String Swap Can Make Strings Equal
• 1791. Find Center of Star Graph
• 1796. Second Largest Digit in a String
• 1797. Design Authentication Manager
• 1798. Maximum Number of Consecutive Values You Can Make
• 1799. Maximize Score After N Operations
• 1800. Maximum Ascending Subarray Sum
• 1801. Number of Orders in the Backlog
• 1806. Minimum Number of Operations to Reinitialize a Permutation
• 1807. Evaluate the Bracket Pairs of a String
• 1813. Sentence Similarity III
• 1814. Count Nice Pairs in an Array
• 1817. Finding the Users Active Minutes
• 1822. Sign of the Product of an Array
• 1823. Find the Winner of the Circular Game
• 1825. Finding MK Average
• 1828. Queries on Number of Points Inside a Circle
• 1829. Maximum XOR for Each Query
• 1832. Check if the Sentence Is Pangram
• 1833. Maximum Ice Cream Bars
• 1834. Single-Threaded CPU
• 1838. Frequency of the Most Frequent Element
• 1839. Longest Substring Of All Vowels in Order
• 1845. Seat Reservation Manager
• 1846. Maximum Element After Decreasing and Rearranging
• 1857. Largest Color Value in a Directed Graph
• 1860. Incremental Memory Leak
• 1861. Rotating the Box
• 1863. Sum of All Subset XOR Totals
• 1865. Finding Pairs With a Certain Sum
• 1870. Minimum Speed to Arrive on Time
• 1871. Jump Game VII
• 1876. Substrings of Size Three with Distinct Characters
• 1877. Minimize Maximum Pair Sum in Array
• 1878. Get Biggest Three Rhombus Sums in a Grid
• 1881. Maximum Value after Insertion
• 1887. Reduction Operations to Make the Array Elements Equal
• 1894. Find the Student that Will Replace the Chalk
• 1895. Largest Magic Square
• 1897. Redistribute Characters to Make All Strings Equal
• 1903. Largest Odd Number in String
• 1904. The Number of Full Rounds You Have Played\
• 1905. Count Sub Islands
• 1910. Remove All Occurrences of a Substring
• 1913. Maximum Product Difference Between Two Pairs
• 1914. Cyclically Rotating a Grid
• 1915. Number of Wonderful Substrings
• 1921. Eliminate Maximum Number of Monsters
• 1922. Count Good Numbers
• 1925. Count Square Sum Triples
• 1926. Nearest Exit from Entrance in Maze
• 1930. Unique Length-3 Palindromic Subsequences
• 1935. Maximum Number of Words You Can Type
• 1937. Maximum Number of Points with Cost
• 1942. The Number of the Smallest Unoccupied Chair
• 1945. Sum of Digits of String After Convert
• 1946. Largest Number After Mutating Substring
• 1952. Three Divisors
• 1954. Minimum Garden Perimeter to Collect Enough Apples
• 1957. Delete Characters to Make Fancy String
• 1958. Check if Move is Legal
• 1962. Remove Stones to Minimize the Total
• 1963. Minimum Number of Swaps to Make the String Balanced
• 1964. Find the Longest Valid Obstacle Course at Each Position
• 1968. Array With Elements Not Equal to Average of Neighbors
• 1971. Find if Path Exists in Graph
• 1975. Maximum Matrix Sum
• 1980. Find Unique Binary String
• 1985. Find the Kth Largest Integer in the Array
• 1992. Find All Groups of Farmland
• 1993. Operations on Tree
• 1996. The Number of Weak Characters in the Game
• 2000. Reverse Prefix of Word
• 2001. Number of Pairs of Interchangeable Rectangles
• 2007. Find Original Array From Doubled Array
• 2009. Minimum Number of Operations to Make Array Continuous
• 2011. Final Value of Variable After Performing Operations
• 2013. Detect Squares
• 2017. Grid Game
• 2018. Check if Word Can Be Placed In Crossword
• 2022. Convert 1D Array Into 2D Array
• 2023. Number of Pairs of Strings With Concatenation Equal to Target
• 2024. Maximize the Confusion of an Exam
• 2028. Find Missing Observations
• 2033. Minimum Operations to Make a Uni-Value Grid
• 2034. Stock Price Fluctuation
• 2037. Minimum Number of Moves to Seat Everyone
• 2038. Remove Colored Pieces if Both Neighbors are the Same Color
• 2043. Simple Bank System
• 2044. Count Number of Maximum Bitwise-OR Subsets
• 2045. Second Minimum Time to Reach Destination
• 2048. Next Greater Numerically Balanced Number
• 2049. Count Nodes With the Highest Score
• 2050. Parallel Courses III
• 2053. Kth Distinct String in an Array
• 2056. Number of Valid Move Combinations On Chessboard
• 2058. Find the Minimum and Maximum Number of Nodes Between Critical Points
• 2063. Vowels of All Substrings
• 2064. Minimized Maximum of Products Distributed to Any Store
• 2069. Walking Robot Simulation II
• 2070. Most Beautiful Item for Each Query
• 2073. Time Needed to Buy Tickets
• 2074. Reverse Nodes in Even Length Groups
• 2075. Decode the Slanted Ciphertext
• 2079. Watering Plants
• 2080. Range Frequency Queries
• 2081. Sum of k-Mirror Numbers
• 2087. Minimum Cost Homecoming of a Robot in a Grid
• 2090. K Radius Subarray Averages
• 2092. Find All People With Secret
• 2095. Delete the Middle Node of a Linked List
• 2096. Step-By-Step Directions From a Binary Tree Node to Another
• 2101. Detonate the Maximum Bombs
• 2102. Sequentially Ordinal Rank Tracker
• 2105. Watering Plants II
• 2108. Find First Palindromic String in the Array
• 2109. Adding Spaces to a String
• 2110. Number of Smooth Descent Periods of a Stock
• 2117. Abbreviating the Product of a Range
• 2119. A Number After a Double Reversal
• 2120. Execution of All Suffix Instructions Staying in a Grid
• 2121. Intervals Between Identical Elements
• 2125. Number of Laser Beams in a Bank
• 2126. Destroying Asteroids
• 2130. Maximum Twin Sum of a Linked List
• 2131. Longest Palindrome by Concatenating Two Letter Words
• 2134. Minimum Swaps to Group All 1's Together II
• 2135. Count Words Obtained After Adding a Letter
• 2136. Earliest Possible Day of Full Bloom
• 2139. Minimum Moves to Reach Target Score
• 2140. Solving Questions With Brainpower
• 2141. Maximum Running Time of N Computers
• 2147. Number of Ways to Divide a Long Corridor
• 2149. Rearrange Array Elements by Sign
• 2150. Find All Lonely Numbers in the Array
• 2160. Minimum Sum of Four Digit Number After Splitting Digits
• 2161. Partition Array According to Given Pivot
• 2162. Minimum Cost to Set Cooking Time
• 2165. Smallest Value of the Rearranged Number
• 2166. Design Bitset
• 2169. Count Operations to Obtain Zero
• 2171. Removing Minimum Number of Magic Beans
• 2177. Find Three Consecutive Integers That Sum to a Given Number
• 2178. Maximum Split of Positive Even Integers
• 2180. Count Integers With Even Digit Sum
• 2181. Merge Nodes in Between Zeros
• 2182. Construct String With Repeat Limit
• 2186. Minimum Number of Steps to Make Two Strings Anagram II
• 2187. Minimum Time to Complete Trips
• 2191. Sort the Jumbled Numbers
• 2192. All Ancestors of a Node in a Directed Acyclic Graph
• 2195. Append K Integers With Minimal Sum
• 2196. Create Binary Tree From Descriptions
• 2197. Replace Non-Coprime Numbers in Array
• 2201. Count Artifacts That Can Be Extracted
• 2211. Count Collisions on a Road
• 2212. Maximum Points in an Archery Competition
• 2215. Find the Difference of Two Arrays
• 2217. Find Palindrome With Fixed Length
• 2218. Maximum Value of K Coins From Piles
• 2220. Minimum Bit Flips to Convert Number
• 2221. Find Triangular Sum of an Array
• 2222. Number of Ways to Select Buildings
• 2225. Find Players With Zero or One Losses
• 2227. Encrypt and Decrypt Strings
• 2232. Minimize Result by Adding Parentheses to Expression
• 2233. Maximum Product After K Increments
• 2236. Root Equals Sum of Children
• 2240. Number of Ways to Buy Pens and Pencils
• 2241. Design an ATM Machine
• 2244. Minimum Rounds to Complete All Tasks
• 2246. Longest Path With Different Adjacent Characters
• 2249. Count Lattice Points Inside a Circle
• 2251. Number of Flowers in Full Bloom
• 2256. Minimum Average Difference
• 2257. Count Unguarded Cells in the Grid
• 2260. Minimum Consecutive Cards to Pick Up
• 2261. K Divisible Elements Subarrays
• 2264. Largest 3-Same-Digit Number in String
• 2265. Count Nodes Equal to Average of Subtree
• 2266. Count Number of Texts
• 2267. Check if There Is a Valid Parentheses String Path
• 2269. Find the K-Beauty of a Number
• 2272. Substring With Largest Variance
• 2273. Find Resultant Array After Removing Anagrams
• 2274. Maximum Consecutive Floors Without Special Floors
• 2275. Largest Combination With Bitwise AND Greater Than Zero
• 2276. Count Integers in Intervals
• 2278. Percentage of Letter in String
• 2279. Maximum Bags With Full Capacity of Rocks
• 2280. Minimum Lines to Represent a Line Chart
• 2284. Sender With Largest Word Count
• 2285. Maximum Total Importance of Roads
• 2294. Partition Array Such That Maximum Difference Is K
• 2295. Replace Elements in an Array
• 2296. Design a Text Editor
• 2300. Successful Pairs of Spells and Potions
• 2304. Minimum Path Cost in a Grid
• 2305. Fair Distribution of Cookies
• 2306. Naming a Company
• 2309. Greatest English Letter in Upper and Lower Case
• 2310. Sum of Numbers With Units Digit K
• 2316. Count Unreachable Pairs of Nodes in an Undirected Graph
• 2326. Spiral Matrix IV
• 2331. Evaluate Boolean Binary Tree
• 2336. Smallest Number in Infinite Set
• 2342. Max Sum of a Pair With Equal Sum of Digits
• 2348. Number of Zero-Filled Subarrays
• 2349. Design a Number Container System
• 2352. Equal Row and Column Pairs
• 2353. Design a Food Rating System
• 2359. Find Closest Node to Given Two Nodes
• 2360. Longest Cycle in a Graph
• 2364. Count Number of Bad Pairs
• 2365. Task Scheduler II
• 2366. Minimum Replacements to Sort the Array
• 2368. Reachable Nodes With Restrictions
• 2369. Check if There is a Valid Partition For The Array
• 2370. Longest Ideal Subsequence
• 2373. Largest Local Values in a Matrix
• 2374. Node With Highest Edge Score
• 2375. Construct Smallest Number From DI String
• 2376. Count Special Integers
• 2381. Shifting Letters II
• 2384. Largest Palindromic Number
• 2385. Amount of Time for Binary Tree to Be Infected
• 2389. Longest Subsequence With Limited Sum
• 2390. Removing Stars From a String
• 2391. Minimum Amount of Time to Collect Garbage
• 2392. Build a Matrix With Conditions
• 2396. Strictly Palindromic Number
• 2397. Maximum Rows Covered by Columns
• 2400. Number of Ways to Reach a Position After Exactly k Steps
• 2401. Longest Nice Subarray
• 2402. Meeting Rooms III
• 2405. Optimal Partition of String
• 2406. Divide Intervals Into Minimum Number of Groups
• 2409. Count Days Spent Together
• 2410. Maximum Matching of Players With Trainers
• 2411. Smallest Subarrays With Maximum Bitwise OR
• 2413. Smallest Even Multiple
• 2414. Length of the Longest Alphabetical Continuous Substring
• 2415. Reverse Odd Levels of Binary Tree
• 2416. Sum of Prefix Scores of Strings
• 2418. Sort the People
• 2419. Longest Subarray With Maximum Bitwise AND
• 2424. Longest Uploaded Prefix
• 2425. Bitwise XOR of All Pairings
• 2428. Maximum Sum of an Hourglass
• 2433. Find The Original Array of Prefix Xor
• 2434. Using a Robot to Print the Lexicographically Smallest String
• 2435. Paths in Matrix Whose Sum Is Divisible by K
• 2438. Range Product Queries of Powers
• 2439. Minimize Maximum of Array
• 2441. Largest Positive Integer That Exists With Its Negative
• 2442. Count Number of Distinct Integers After Reverse Operations
• 2443. Sum of Number and Its Reverse
• 2444. Count Subarrays With Fixed Bounds
• 2447. Number of Subarrays With GCD Equal to K
• 2453. Destroy Sequential Targets
• 2456. Most Popular Video Creator
• 2457. Minimum Addition to Make Integer Beautiful
• 2458. Height of Binary Tree After Subtree Removal Queries
• 2461. Maximum Sum of Distinct Subarrays With Length K
• 2462. Total Cost to Hire K Workers
• 2466. Count Ways To Build Good Strings
• 2467. Most Profitable Path in a Tree
• 2468. Split Message Based on Limit
• 2471. Minimum Number of Operations to Sort a Binary Tree by Level
• 2476. Closest Nodes Queries in a Binary Search Tree
• 2477. Minimum Fuel Cost to Report to the Capital
• 2482. Difference Between Ones and Zeros in Row and Column
• 2483. Minimum Penalty for a Shop
• 2485. Find the Pivot Integer
• 2486. Append Characters to String to Make Subsequence
• 2487. Remove Nodes From Linked List
• 2490. Circular Sentence
• 2491. Divide Players Into Teams of Equal Skill
• 2492. Minimum Score of a Path Between Two Cities
• 2496. Maximum Value of a String in an Array
• 2497. Maximum Star Sum of a Graph
• 2498. Frog Jump II
• 2501. Longest Square Streak in an Array
• 2502. Design Memory Allocator
• 2507. Smallest Value After Replacing With Sum of Prime Factors
• 2508. Add Edges to Make Degrees of All Nodes Even
• 2509. Cycle Length Queries in a Tree
• 2512. Reward Top K Students
• 2514. Count Anagrams
• 2521. Distinct Prime Factors of Product of Array
• 2522. Partition String Into Substrings With Values at Most K
• 2523. Closest Prime Numbers in Range
• 2526. Find Consecutive Integers from a Data Stream
• 2530. Maximal Score After Applying K Operations
• 2531. Make Number of Distinct Characters Equal
• 2535. Difference Between Element Sum and Digit Sum of an Array
• 2536. Increment Submatrices by One
• 2540. Minimum Common Value
• 2542. Maximum Subsequence Score
• 2545. Sort the Students by Their Kth Score
• 2546. Apply Bitwise Operations to Make Strings Equal
• 2549. Count Distinct Numbers on Board
• 2550. Count Collisions of Monkeys on a Polygon
• 2551. Put Marbles in Bags
• 2554. Maximum Number of Integers to Choose From a Range I
• 2559. Count Vowel Strings in Ranges
• 2563. Count the Number of Fair Pairs
• 2564. Substring XOR Queries
• 2566. Maximum Difference by Remapping a Digit
• 2567. Minimum Score by Changing Two Elements
• 2568. Minimum Impossible OR
• 2571. Minimum Operations to Reduce an Integer to 0
• 2575. Find the Divisibility Array of a String
• 2576. Find the Maximum Number of Marked Indices
• 2579. Count Total Number of Colored Cells
• 2580. Count Ways to Group Overlapping Ranges
• 2582. Pass the Pillow
• 2583. Kth Largest Sum in a Binary Tree
• 2587. Rearrange Array to Maximize Prefix Score
• 2593. Find Score of an Array After Marking All Elements
• 2596. Check Knight Tour Configuration
• 2597. The Number of Beautiful Subsets
• 2598. Smallest Missing Non-negative Integer After Operations
• 2601. Prime Subtraction Operation
• 2602. Minimum Operations to Make All Array Elements Equal
• 2606. Find the Substring With Maximum Cost
• 2608. Shortest Cycle in a Graph
• 2610. Convert an Array Into a 2D Array With Conditions
• 2611. Mice and Cheese
• 2615. Sum of Distances
• 2616. Minimize the Maximum Difference of Pairs
• 2640. Find the Score of All Prefixes of an Array
• 2641. Cousins in Binary Tree II
• 2642. Design Graph With Shortest Path Calculator
• 2645. Minimum Additions to Make Valid String
• 2653. Sliding Subarray Beauty
• 2657. Find the Prefix Common Array of Two Arrays
• 2658. Maximum Number of Fish in a Grid
• 2661. First Completely Painted Row or Column
• 2671. Frequency Tracker
• 2672. Number of Adjacent Elements With the Same Color
• 2673. Make Costs of Paths Equal in a Binary Tree
• 2678. Number of Senior Citizens
• 2679. Sum in a Matrix
• 2683. Neighboring Bitwise XOR
• 2684. Maximum Number of Moves in a Grid
• 2685. Count the Number of Complete Components
• 2696. Minimum String Length After Removing Substrings
• 2698. Find the Punishment Number of an Integer
• 2699. Modify Graph Edge Weights
• 2706. Buy Two Chocolates
• 2707. Extra Characters in a String
• 2708. Maximum Strength of a Group
• 2709. Greatest Common Divisor Traversal
• 2711. Difference of Number of Distinct Values on Diagonals
• 2718. Sum of Matrix After Queries
• 2730. Find the Longest Semi-Repetitive Substring
• 2734. Lexicographically Smallest String After Substring Operation
• 2740. Find the Value of the Partition
• 2745. Construct the Longest New String
• 2746. Decremental String Concatenation
• 2747. Count Zero Request Servers
• 2750. Ways to Split Array Into Good Subarrays
• 2751. Robot Collisions
• 2761. Prime Pairs With Target Sum
• 2762. Continuous Subarrays
• 2766. Relocate Marbles
• 2767. Partition String Into Minimum Beautiful Substrings
• 2768. Number of Black Blocks
• 2770. Maximum Number of Jumps to Reach the Last Index
• 2780. Minimum Index of a Valid Split
• 2781. Length of the Longest Valid Substring
• 2785. Sort Vowels in a String
• 2800. Shortest String That Contains Three Strings
• 2807. Insert Greatest Common Divisors in Linked List
• 2811. Check if it is Possible to Split Array
• 2812. Find the Safest Path in a Grid
• 2816. Double a Number Represented as a Linked List
• 2817. Minimum Absolute Difference Between Elements With Constraint
• 2825. Make String a Subsequence Using Cyclic Increments
• 2828. Check if a String Is an Acronym of Words
• 2829. Determine the Minimum Sum of a k-avoiding Array
• 2831. Find the Longest Equal Subarray
• 2834. Find the Minimum Possible Sum of a Beautiful Array
• 2840. Check if Strings Can be Made Equal With Operations II
• 2841. Maximum Sum of Almost Unique Subarray
• 2844. Minimum Operations to Make a Special Number
• 2849. Determine if a Cell Is Reachable at a Given Time
• 2857. Count Pairs of Points With Distance k
• 2860. Happy Students
• 2864. Maximum Odd Binary Number
• 2865. Beautiful Towers I
• 2866. Beautiful Towers II
• 2870. Minimum Number of Operations to Make Array Empty
• 2875. Minimum Size Subarray in Infinite Array
• 2876. Count Visited Nodes in a Directed Graph
• 2895. Minimum Processing Time
• 2901. Longest Unequal Adjacent Groups Subsequence II
• 2904. Shortest and Lexicographically Smallest Beautiful String
• 2905. Find Indices With Index and Value Difference II
• 2906. Construct Product Matrix
• 2909. Minimum Sum of Mountain Triplets II
• 2914. Minimum Number of Changes to Make Binary String Beautiful
• 2915. Length of the Longest Subsequence That Sums to Target
• 2918. Minimum Equal Sum of Two Arrays After Replacing Zeros
• 2924. Find Champion II
• 2929. Distribute Candies Among Children II
• 2933. High-Access Employees
• 2937. Make Three Strings Equal
• 2938. Separate Black and White Balls
• 2947. Count Beautiful Substrings I
• 2958. Length of Longest Subarray With at Most K Frequency
• 2961. Double Modular Exponentiation
• 2962. Count Subarrays Where Max Element Appears at Least K Times
• 2966. Divide Array Into Arrays With Max Difference
• 2967. Minimum Cost to Make Array Equalindromic
• 2971. Find Polygon With the Largest Perimeter
• 2973. Find Number of Coins to Place in Tree Nodes
• 2975. Maximum Square Area by Removing Fences From a Field
• 2976. Minimum Cost to Convert String I
• 2981. Find Longest Special Substring That Occurs Thrice I
• 2982. Find Longest Special Substring That Occurs Thrice II
• 2997. Minimum Number of Operations to Make Array XOR Equal to K
• 3001. Minimum Moves to Capture The Queen
• 3002. Maximum Size of a Set After Removals
• 3005. Count Elements With Maximum Frequency
• 3006. Find Beautiful Indices in the Given Array I
• 3011. Find if Array Can Be Sorted
• 3015. Count the Number of Houses at a Certain Distance I
• 3016. Minimum Number of Pushes to Type Word II
• 3020. Find the Maximum Number of Elements in Subset
• 3025. Find the Number of Ways to Place People I
• 3026. Maximum Good Subarray Sum
• 3030. Find the Grid of Region Average
• 3035. Maximum Palindromes After Operations
• 3039. Apply Operations to Make String Empty
• 3043. Find the Length of the Longest Common Prefix
• 3044. Most Frequent Prime
• 3047. Find the Largest Area of Square Inside Two Rectangles
• 3066. Minimum Operations to Exceed Threshold Value II
• 3070. Count Submatrices with Top-Left Element and Sum Less Than k
• 3071. Minimum Operations to Write the Letter Y on a Grid
• 3075. Maximize Happiness of Selected Children
• 3076. Shortest Uncommon Substring in an Array
• 3081. Replace Question Marks in String to Minimize Its Value
• 3084. Count Substrings Starting and Ending with Given Character
• 3092. Most Frequent IDs
• 3097. Shortest Subarray With OR at Least K II
• 3100. Water Bottles II
• 3101. Count Alternating Subarrays
• 3106. Lexicographically Smallest String After Operations With Constraint
• 3107. Minimum Operations to Make Median of Array Equal to K
• 3110. Score of a String
• 3111. Minimum Rectangles to Cover Points
• 3115. Maximum Prime Difference
• 3121. Count the Number of Special Characters II
• 3132. Find the Integer Added to Array II
• 3133. Minimum Array End
• 3138. Minimum Length of Anagram Concatenation
• 3143. Maximum Points Inside the Square
• 3152. Special Array II
• 3153. Sum of Digit Differences of All Pairs
• 3159. Find Occurrences of an Element in an Array
• 3160. Find the Number of Distinct Colors Among the Balls
• 3163. String Compression III
• 3164. Find the Number of Good Pairs II
• 3169. Count Days Without Meetings
• 3170. Lexicographically Minimum String After Removing Stars
• 3175. Find The First Player to win K Games in a Row
• 3179. Find the N-th Value After K Seconds
• 3185. Count Pairs That Form a Complete Day II
• 3191. Minimum Operations to Make Binary Array Elements Equal to One I
• 3192. Minimum Operations to Make Binary Array Elements Equal to One II
• 3195. Find the Minimum Area to Cover All Ones I
• 3201. Find the Maximum Length of Valid Subsequence I
• 3207. Maximum Points After Enemy Battles
• 3208. Alternating Groups II
• 3211. Generate Binary Strings Without Adjacent Zeros
• 3212. Count Submatrices With Equal Frequency of X and Y
• 3217. Delete Nodes From Linked List Present in Array
• 3223. Minimum Length of String After Operations
• 3227. Vowels Game in a String
• 3228. Maximum Number of Operations to Move Ones to the End
• 3233. Find the Count of Numbers Which Are Not Special
• 3239. Minimum Number of Flips to Make Binary Grid Palindromic I
• 3240. Minimum Number of Flips to Make Binary Grid Palindromic II
• 3243. Shortest Distance After Road Addition Queries I
• 3249. Count the Number of Good Nodes
• 3254. Find the Power of K-Size Subarrays I
• 3255. Find the Power of K-Size Subarrays II
• 3259. Maximum Energy Boost From Two Drinks
• 3265. Count Almost Equal Pairs I
• 3271. Hash Divided String