Solutions

0001. Two Sum 0002. Add Two Numbers 0003. Longest Substring Without Repeating Characters 0004. Median of Two Sorted Arrays 0005. Longest Palindromic Substring 0006. ZigZag Conversion 0007. Reverse Integer 0008. String to Integer (solutions/atoi)0009. Palindrome Number 0010. Regular Expression Matching 0011. Container With Most Water 0012. Integer to Roman 0013. Roman to Integer 0014. Longest Common Prefix 0015. 3Sum 0016. 3Sum Closest 0017. Letter Combinations of a Phone Number 0018. 4Sum 0019. Remove Nth Node From End of List 0020. Valid Parentheses 0021. Merge Two Sorted Lists 0022. Generate Parentheses 0023. Merge k Sorted Lists 0024. Swap Nodes in Pairs 0025. Reverse Nodes in k-Group 0026. Remove Duplicates from Sorted Array 0027. Remove Element 0028. Implement strStr(solutions/)0029. Divide Two Integers 0030. Substring with Concatenation of All Words 0031. Next Permutation 0032. Longest Valid Parentheses 0033. Search in Rotated Sorted Array 0034. Find First and Last Position of Element in Sorted Array 0035. Search Insert Position 0036. Valid Sudoku 0037. Sudoku Solver 0038. Count and Say 0039. Combination Sum 0040. Combination Sum II 0041. First Missing Positive 0042. Trapping Rain Water 0043. Multiply Strings 0044. Wildcard Matching 0045. Jump Game II 0046. Permutations 0047. Permutations II 0048. Rotate Image 0049. Group Anagrams 0050. Pow(solutions/x, n)0051. N-Queens 0052. N-Queens II 0053. Maximum Subarray 0054. Spiral Matrix 0055. Jump Game 0056. Merge Intervals 0057. Insert Interval 0058. Length of Last Word 0059. Spiral Matrix II 0060. Permutation Sequence 0061. Rotate List 0062. Unique Paths 0063. Unique Paths II 0064. Minimum Path Sum 0065. Valid Number 0066. Plus One 0067. Add Binary 0068. Text Justification 0069. Sqrt(solutions/x)0070. Climbing Stairs 0071. Simplify Path 0072. Edit Distance 0073. Set Matrix Zeroes 0074. Search a 2D Matrix 0075. Sort Colors 0076. Minimum Window Substring 0077. Combinations 0078. Subsets 0079. Word Search 0080. Remove Duplicates from Sorted Array II 0081. Search in Rotated Sorted Array II 0082. Remove Duplicates from Sorted List II 0083. Remove Duplicates from Sorted List 0084. Largest Rectangle in Histogram 0085. Maximal Rectangle 0086. Partition List 0087. Scramble String 0088. Merge Sorted Array 0089. Gray Code 0090. Subsets II 0091. Decode Ways 0092. Reverse Linked List II 0093. Restore IP Addresses 0094. Binary Tree Inorder Traversal 0095. Unique Binary Search Trees II 0096. Unique Binary Search Trees 0097. Interleaving String 0098. Validate Binary Search Tree 0099. Recover Binary Search Tree 0100. Same Tree 0101. Symmetric Tree 0102. Binary Tree Level Order Traversal 0103. Binary Tree Zigzag Level Order Traversal 0104. Maximum Depth of Binary Tree 0105. Construct Binary Tree from Preorder and Inorder Traversal 0106. Construct Binary Tree from Inorder and Postorder Traversal 0107. Binary Tree Level Order Traversal II 0108. Convert Sorted Array to Binary Search Tree 0109. Convert Sorted List to Binary Search Tree 0110. Balanced Binary Tree 0111. Minimum Depth of Binary Tree 0112. Path Sum 0113. Path Sum II 0114. Flatten Binary Tree to Linked List 0115. Distinct Subsequences 0116. Populating Next Right Pointers in Each Node 0117. Populating Next Right Pointers in Each Node II 0118. Pascal's Triangle 0119. Pascal's Triangle II 0120. Triangle 0121. Best Time to Buy and Sell Stock 0122. Best Time to Buy and Sell Stock II 0123. Best Time to Buy and Sell Stock III 0124. Binary Tree Maximum Path Sum 0125. Valid Palindrome 0126. Word Ladder II 0127. Word Ladder 0128. Longest Consecutive Sequence 0129. Sum Root to Leaf Numbers 0130. Surrounded Regions 0131. Palindrome Partitioning 0132. Palindrome Partitioning II 0133. Clone Graph 0134. Gas Station 0135. Candy 0136. Single Number 0137. Single Number II 0138. Copy List with Random Pointer 0139. Word Break 0140. Word Break II 0141. Linked List Cycle 0142. Linked List Cycle II 0143. Reorder List 0144. Binary Tree Preorder Traversal 0145. Binary Tree Postorder Traversal 0146. LRU Cache 0147. Insertion Sort List 0148. Sort List 0149. Max Points on a Line 0150. Evaluate Reverse Polish Notation 0151. Reverse Words in a String 0152. Maximum Product Subarray 0153. Find Minimum in Rotated Sorted Array 0154. Find Minimum in Rotated Sorted Array II 0155. Min Stack 0156. Binary Tree Upside Down 0157. Read N Characters Given Read4 0158. Read N Characters Given Read4 II - Call multiple times 0159. Longest Substring with At Most Two Distinct Characters 0160. Intersection of Two Linked Lists 0161. One Edit Distance 0162. Find Peak Element 0163. Missing Ranges 0164. Maximum Gap 0165. Compare Version Numbers 0166. Fraction to Recurring Decimal 0167. Two Sum II - Input array is sorted 0168. Excel Sheet Column Title 0169. Majority Element 0170. Two Sum III - Data structure design 0171. Excel Sheet Column Number 0172. Factorial Trailing Zeroes 0173. Binary Search Tree Iterator 0174. Dungeon Game 0175. Combine Two Tables 0176. Second Highest Salary 0177. Nth Highest Salary 0178. Rank Scores 0179. Largest Number 0180. Consecutive Numbers 0181. Employees Earning More Than Their Managers 0182. Duplicate Emails 0183. Customers Who Never Order 0184. Department Highest Salary 0185. Department Top Three Salaries 0186. Reverse Words in a String II 0187. Repeated DNA Sequences 0188. Best Time to Buy and Sell Stock IV 0189. Rotate Array 0190. Reverse Bits 0191. Number of 1 Bits 0192. Word Frequency 0193. Valid Phone Numbers 0194. Transpose File 0195. Tenth Line 0196. Delete Duplicate Emails 0197. Rising Temperature 0198. House Robber 0199. Binary Tree Right Side View 0200. Number of Islands 0201. Bitwise AND of Numbers Range 0202. Happy Number 0203. Remove Linked List Elements 0204. Count Primes 0205. Isomorphic Strings 0206. Reverse Linked List 0207. Course Schedule 0208. Implement Trie (solutions/Prefix Tree)0209. Minimum Size Subarray Sum 0210. Course Schedule II 0211. Design Add and Search Words Data Structure 0212. Word Search II 0213. House Robber II 0214. Shortest Palindrome 0215. Kth Largest Element in an Array 0216. Combination Sum III 0217. Contains Duplicate 0218. The Skyline Problem 0219. Contains Duplicate II 0220. Contains Duplicate III 0221. Maximal Square 0222. Count Complete Tree Nodes 0223. Rectangle Area 0224. Basic Calculator 0225. Implement Stack using Queues 0226. Invert Binary Tree 0227. Basic Calculator II 0228. Summary Ranges 0229. Majority Element II 0230. Kth Smallest Element in a BST 0231. Power of Two 0232. Implement Queue using Stacks 0233. Number of Digit One 0234. Palindrome Linked List 0235. Lowest Common Ancestor of a Binary Search Tree 0236. Lowest Common Ancestor of a Binary Tree 0237. Delete Node in a Linked List 0238. Product of Array Except Self 0239. Sliding Window Maximum 0240. Search a 2D Matrix II 0241. Different Ways to Add Parentheses 0242. Valid Anagram 0243. Shortest Word Distance 0244. Shortest Word Distance II 0245. Shortest Word Distance III 0246. Strobogrammatic Number 0247. Strobogrammatic Number II 0248. Strobogrammatic Number III 0249. Group Shifted Strings 0250. Count Univalue Subtrees 0251. Flatten 2D Vector 0252. Meeting Rooms 0253. Meeting Rooms II 0254. Factor Combinations 0255. Verify Preorder Sequence in Binary Search Tree 0256. Paint House 0257. Binary Tree Paths 0258. Add Digits 0259. 3Sum Smaller 0260. Single Number III 0261. Graph Valid Tree 0262. Trips and Users 0263. Ugly Number 0264. Ugly Number II 0265. Paint House II 0266. Palindrome Permutation 0267. Palindrome Permutation II 0268. Missing Number 0269. Alien Dictionary 0270. Closest Binary Search Tree Value 0271. Encode and Decode Strings 0272. Closest Binary Search Tree Value II 0273. Integer to English Words 0274. H-Index 0275. H-Index II 0276. Paint Fence 0277. Find the Celebrity 0278. First Bad Version 0279. Perfect Squares 0280. Wiggle Sort 0281. Zigzag Iterator 0282. Expression Add Operators 0283. Move Zeroes 0284. Peeking Iterator 0285. Inorder Successor in BST 0286. Walls and Gates 0287. Find the Duplicate Number 0288. Unique Word Abbreviation 0289. Game of Life 0290. Word Pattern 0291. Word Pattern II 0292. Nim Game 0293. Flip Game 0294. Flip Game II 0295. Find Median from Data Stream 0296. Best Meeting Point 0297. Serialize and Deserialize Binary Tree 0298. Binary Tree Longest Consecutive Sequence 0299. Bulls and Cows 0300. Longest Increasing Subsequence 0301. Remove Invalid Parentheses 0302. Smallest Rectangle Enclosing Black Pixels 0303. Range Sum Query - Immutable 0304. Range Sum Query 2D - Immutable 0305. Number of Islands II 0306. Additive Number 0307. Range Sum Query - Mutable 0308. Range Sum Query 2D - Mutable 0309. Best Time to Buy and Sell Stock with Cooldown 0310. Minimum Height Trees 0311. Sparse Matrix Multiplication 0312. Burst Balloons 0313. Super Ugly Number 0314. Binary Tree Vertical Order Traversal 0315. Count of Smaller Numbers After Self 0316. Remove Duplicate Letters 0317. Shortest Distance from All Buildings 0318. Maximum Product of Word Lengths 0319. Bulb Switcher 0320. Generalized Abbreviation 0321. Create Maximum Number 0322. Coin Change 0323. Number of Connected Components in an Undirected Graph 0324. Wiggle Sort II 0325. Maximum Size Subarray Sum Equals k 0326. Power of Three 0327. Count of Range Sum 0328. Odd Even Linked List 0329. Longest Increasing Path in a Matrix 0330. Patching Array 0331. Verify Preorder Serialization of a Binary Tree 0332. Reconstruct Itinerary 0333. Largest BST Subtree 0334. Increasing Triplet Subsequence 0335. Self Crossing 0336. Palindrome Pairs 0337. House Robber III 0338. Counting Bits 0339. Nested List Weight Sum 0340. Longest Substring with At Most K Distinct Characters 0341. Flatten Nested List Iterator 0342. Power of Four 0343. Integer Break 0344. Reverse String 0345. Reverse Vowels of a String 0346. Moving Average from Data Stream 0347. Top K Frequent Elements 0348. Design Tic-Tac-Toe 0349. Intersection of Two Arrays 0350. Intersection of Two Arrays II 0351. Android Unlock Patterns 0352. Data Stream as Disjoint Intervals 0353. Design Snake Game 0354. Russian Doll Envelopes 0355. Design Twitter 0356. Line Reflection 0357. Count Numbers with Unique Digits 0358. Rearrange String k Distance Apart 0359. Logger Rate Limiter 0360. Sort Transformed Array 0361. Bomb Enemy 0362. Design Hit Counter 0363. Max Sum of Rectangle No Larger Than K 0364. Nested List Weight Sum II 0365. Water and Jug Problem 0366. Find Leaves of Binary Tree 0367. Valid Perfect Square 0368. Largest Divisible Subset 0369. Plus One Linked List 0370. Range Addition 0371. Sum of Two Integers 0372. Super Pow 0373. Find K Pairs with Smallest Sums 0374. Guess Number Higher or Lower 0375. Guess Number Higher or Lower II 0376. Wiggle Subsequence 0377. Combination Sum IV 0378. Kth Smallest Element in a Sorted Matrix 0379. Design Phone Directory 0380. Insert Delete GetRandom O(solutions/1)0381. Insert Delete GetRandom O(solutions/1) - Duplicates allowed 0382. Linked List Random Node 0383. Ransom Note 0384. Shuffle an Array 0385. Mini Parser 0386. Lexicographical Numbers 0387. First Unique Character in a String 0388. Longest Absolute File Path 0389. Find the Difference 0390. Elimination Game 0391. Perfect Rectangle 0392. Is Subsequence 0393. UTF-8 Validation 0394. Decode String 0395. Longest Substring with At Least K Repeating Characters 0396. Rotate Function 0397. Integer Replacement 0398. Random Pick Index 0399. Evaluate Division 0400. Nth Digit 0401. Binary Watch 0402. Remove K Digits 0403. Frog Jump 0404. Sum of Left Leaves 0405. Convert a Number to Hexadecimal 0406. Queue Reconstruction by Height 0407. Trapping Rain Water II 0408. Valid Word Abbreviation 0409. Longest Palindrome 0410. Split Array Largest Sum 0411. Minimum Unique Word Abbreviation 0412. Fizz Buzz 0413. Arithmetic Slices 0414. Third Maximum Number 0415. Add Strings 0416. Partition Equal Subset Sum 0417. Pacific Atlantic Water Flow 0418. Sentence Screen Fitting 0419. Battleships in a Board 0420. Strong Password Checker 0421. Maximum XOR of Two Numbers in an Array 0422. Valid Word Square 0423. Reconstruct Original Digits from English 0424. Longest Repeating Character Replacement 0425. Word Squares 0426. Convert Binary Search Tree to Sorted Doubly Linked List 0427. Construct Quad Tree 0428. Serialize and Deserialize N-ary Tree 0429. N-ary Tree Level Order Traversal 0430. Flatten a Multilevel Doubly Linked List 0431. Encode N-ary Tree to Binary Tree 0432. All O`one Data Structure 0433. Minimum Genetic Mutation 0434. Number of Segments in a String 0435. Non-overlapping Intervals 0436. Find Right Interval 0437. Path Sum III 0438. Find All Anagrams in a String 0439. Ternary Expression Parser 0440. K-th Smallest in Lexicographical Order 0441. Arranging Coins 0442. Find All Duplicates in an Array 0443. String Compression 0444. Sequence Reconstruction 0445. Add Two Numbers II 0446. Arithmetic Slices II - Subsequence 0447. Number of Boomerangs 0448. Find All Numbers Disappeared in an Array 0449. Serialize and Deserialize BST 0450. Delete Node in a BST 0451. Sort Characters By Frequency 0452. Minimum Number of Arrows to Burst Balloons 0453. Minimum Moves to Equal Array Elements 0454. 4Sum II 0455. Assign Cookies 0456. 132 Pattern 0457. Circular Array Loop 0458. Poor Pigs 0459. Repeated Substring Pattern 0460. LFU Cache 0461. Hamming Distance 0462. Minimum Moves to Equal Array Elements II 0463. Island Perimeter 0464. Can I Win 0465. Optimal Account Balancing 0466. Count The Repetitions 0467. Unique Substrings in Wraparound String 0468. Validate IP Address 0469. Convex Polygon 0470. Implement Rand10(solutions/) Using Rand7(solutions/)0471. Encode String with Shortest Length 0472. Concatenated Words 0473. Matchsticks to Square 0474. Ones and Zeroes 0475. Heaters 0476. Number Complement 0477. Total Hamming Distance 0478. Generate Random Point in a Circle 0479. Largest Palindrome Product 0480. Sliding Window Median 0481. Magical String 0482. License Key Formatting 0483. Smallest Good Base 0484. Find Permutation 0485. Max Consecutive Ones 0486. Predict the Winner 0487. Max Consecutive Ones II 0488. Zuma Game 0489. Robot Room Cleaner 0490. The Maze 0491. Increasing Subsequences 0492. Construct the Rectangle 0493. Reverse Pairs 0494. Target Sum 0495. Teemo Attacking 0496. Next Greater Element I 0497. Random Point in Non-overlapping Rectangles 0498. Diagonal Traverse 0499. The Maze III 0500. Keyboard Row 0501. Find Mode in Binary Search Tree 0502. IPO 0503. Next Greater Element II 0504. Base 7 0505. The Maze II 0506. Relative Ranks 0507. Perfect Number 0508. Most Frequent Subtree Sum 0509. Fibonacci Number 0510. Inorder Successor in BST II 0511. Game Play Analysis I 0512. Game Play Analysis II 0513. Find Bottom Left Tree Value 0514. Freedom Trail 0515. Find Largest Value in Each Tree Row 0516. Longest Palindromic Subsequence 0517. Super Washing Machines 0518. Coin Change 2 0519. Random Flip Matrix 0520. Detect Capital 0521. Longest Uncommon Subsequence I 0522. Longest Uncommon Subsequence II 0523. Continuous Subarray Sum 0524. Longest Word in Dictionary through Deleting 0525. Contiguous Array 0526. Beautiful Arrangement 0527. Word Abbreviation 0528. Random Pick with Weight 0529. Minesweeper 0530. Minimum Absolute Difference in BST 0531. Lonely Pixel I 0532. K-diff Pairs in an Array 0533. Lonely Pixel II 0534. Game Play Analysis III 0535. Encode and Decode TinyURL 0536. Construct Binary Tree from String 0537. Complex Number Multiplication 0538. Convert BST to Greater Tree 0539. Minimum Time Difference 0540. Single Element in a Sorted Array 0541. Reverse String II 0542. 01 Matrix 0543. Diameter of Binary Tree 0544. Output Contest Matches 0545. Boundary of Binary Tree 0546. Remove Boxes 0547. Number of Provinces 0548. Split Array with Equal Sum 0549. Binary Tree Longest Consecutive Sequence II 0550. Game Play Analysis IV 0551. Student Attendance Record I 0552. Student Attendance Record II 0553. Optimal Division 0554. Brick Wall 0555. Split Concatenated Strings 0556. Next Greater Element III 0557. Reverse Words in a String III 0558. Logical OR of Two Binary Grids Represented as Quad-Trees 0559. Maximum Depth of N-ary Tree 0560. Subarray Sum Equals K 0561. Array Partition I 0562. Longest Line of Consecutive One in Matrix 0563. Binary Tree Tilt 0564. Find the Closest Palindrome 0565. Array Nesting 0566. Reshape the Matrix 0567. Permutation in String 0568. Maximum Vacation Days 0569. Median Employee Salary 0570. Managers with at Least 5 Direct Reports 0571. Find Median Given Frequency of Numbers 0572. Subtree of Another Tree 0573. Squirrel Simulation 0574. Winning Candidate 0575. Distribute Candies 0576. Out of Boundary Paths 0577. Employee Bonus 0578. Get Highest Answer Rate Question 0579. Find Cumulative Salary of an Employee 0580. Count Student Number in Departments 0581. Shortest Unsorted Continuous Subarray 0582. Kill Process 0583. Delete Operation for Two Strings 0584. Find Customer Referee 0585. Investments in 2016 0586. Customer Placing the Largest Number of Orders 0587. Erect the Fence 0588. Design In-Memory File System 0589. N-ary Tree Preorder Traversal 0590. N-ary Tree Postorder Traversal 0591. Tag Validator 0592. Fraction Addition and Subtraction 0593. Valid Square 0594. Longest Harmonious Subsequence 0595. Big Countries 0596. Classes More Than 5 Students 0597. Friend Requests I: Overall Acceptance Rate 0598. Range Addition II 0599. Minimum Index Sum of Two Lists 0600. Non-negative Integers without Consecutive Ones 0601. Human Traffic of Stadium 0602. Friend Requests II: Who Has the Most Friends 0603. Consecutive Available Seats 0604. Design Compressed String Iterator 0605. Can Place Flowers 0606. Construct String from Binary Tree 0607. Sales Person 0608. Tree Node 0609. Find Duplicate File in System 0610. Triangle Judgement 0611. Valid Triangle Number 0612. Shortest Distance in a Plane 0613. Shortest Distance in a Line 0614. Second Degree Follower 0615. Average Salary: Departments VS Company 0616. Add Bold Tag in String 0617. Merge Two Binary Trees 0618. Students Report By Geography 0619. Biggest Single Number 0620. Not Boring Movies 0621. Task Scheduler 0622. Design Circular Queue 0623. Add One Row to Tree 0624. Maximum Distance in Arrays 0625. Minimum Factorization 0626. Exchange Seats 0627. Swap Salary 0628. Maximum Product of Three Numbers 0629. K Inverse Pairs Array 0630. Course Schedule III 0631. Design Excel Sum Formula 0632. Smallest Range Covering Elements from K Lists 0633. Sum of Square Numbers 0634. Find the Derangement of An Array 0635. Design Log Storage System 0636. Exclusive Time of Functions 0637. Average of Levels in Binary Tree 0638. Shopping Offers 0639. Decode Ways II 0640. Solve the Equation 0641. Design Circular Deque 0642. Design Search Autocomplete System 0643. Maximum Average Subarray I 0644. Maximum Average Subarray II 0645. Set Mismatch 0646. Maximum Length of Pair Chain 0647. Palindromic Substrings 0648. Replace Words 0649. Dota2 Senate 0650. 2 Keys Keyboard 0651. 4 Keys Keyboard 0652. Find Duplicate Subtrees 0653. Two Sum IV - Input is a BST 0654. Maximum Binary Tree 0655. Print Binary Tree 0656. Coin Path 0657. Robot Return to Origin 0658. Find K Closest Elements 0659. Split Array into Consecutive Subsequences 0660. Remove 9 0661. Image Smoother 0662. Maximum Width of Binary Tree 0663. Equal Tree Partition 0664. Strange Printer 0665. Non-decreasing Array 0666. Path Sum IV 0667. Beautiful Arrangement II 0668. Kth Smallest Number in Multiplication Table 0669. Trim a Binary Search Tree 0670. Maximum Swap 0671. Second Minimum Node In a Binary Tree 0672. Bulb Switcher II 0673. Number of Longest Increasing Subsequence 0674. Longest Continuous Increasing Subsequence 0675. Cut Off Trees for Golf Event 0676. Implement Magic Dictionary 0677. Map Sum Pairs 0678. Valid Parenthesis String 0679. 24 Game 0680. Valid Palindrome II 0681. Next Closest Time 0682. Baseball Game 0683. K Empty Slots 0684. Redundant Connection 0685. Redundant Connection II 0686. Repeated String Match 0687. Longest Univalue Path 0688. Knight Probability in Chessboard 0689. Maximum Sum of 3 Non-Overlapping Subarrays 0690. Employee Importance 0691. Stickers to Spell Word 0692. Top K Frequent Words 0693. Binary Number with Alternating Bits 0694. Number of Distinct Islands 0695. Max Area of Island 0696. Count Binary Substrings 0697. Degree of an Array 0698. Partition to K Equal Sum Subsets 0699. Falling Squares 0700. Search in a Binary Search Tree 0701. Insert into a Binary Search Tree 0702. Search in a Sorted Array of Unknown Size 0703. Kth Largest Element in a Stream 0704. Binary Search 0705. Design HashSet 0706. Design HashMap 0707. Design Linked List 0708. Insert into a Sorted Circular Linked List 0709. To Lower Case 0710. Random Pick with Blacklist 0711. Number of Distinct Islands II 0712. Minimum ASCII Delete Sum for Two Strings 0713. Subarray Product Less Than K 0714. Best Time to Buy and Sell Stock with Transaction Fee 0715. Range Module 0716. Max Stack 0717. 1-bit and 2-bit Characters 0718. Maximum Length of Repeated Subarray 0719. Find K-th Smallest Pair Distance 0720. Longest Word in Dictionary 0721. Accounts Merge 0722. Remove Comments 0723. Candy Crush 0724. Find Pivot Index 0725. Split Linked List in Parts 0726. Number of Atoms 0727. Minimum Window Subsequence 0728. Self Dividing Numbers 0729. My Calendar I 0730. Count Different Palindromic Subsequences 0731. My Calendar II 0732. My Calendar III 0733. Flood Fill 0734. Sentence Similarity 0735. Asteroid Collision 0736. Parse Lisp Expression 0737. Sentence Similarity II 0738. Monotone Increasing Digits 0739. Daily Temperatures 0740. Delete and Earn 0741. Cherry Pickup 0742. Closest Leaf in a Binary Tree 0743. Network Delay Time 0744. Find Smallest Letter Greater Than Target 0745. Prefix and Suffix Search 0746. Min Cost Climbing Stairs 0747. Largest Number At Least Twice of Others 0748. Shortest Completing Word 0749. Contain Virus 0750. Number Of Corner Rectangles 0751. IP to CIDR 0752. Open the Lock 0753. Cracking the Safe 0754. Reach a Number 0755. Pour Water 0756. Pyramid Transition Matrix 0757. Set Intersection Size At Least Two 0758. Bold Words in String 0759. Employee Free Time 0760. Find Anagram Mappings 0761. Special Binary String 0762. Prime Number of Set Bits in Binary Representation 0763. Partition Labels 0764. Largest Plus Sign 0765. Couples Holding Hands 0766. Toeplitz Matrix 0767. Reorganize String 0768. Max Chunks To Make Sorted II 0769. Max Chunks To Make Sorted 0770. Basic Calculator IV 0771. Jewels and Stones 0772. Basic Calculator III 0773. Sliding Puzzle 0774. Minimize Max Distance to Gas Station 0775. Global and Local Inversions 0776. Split BST 0777. Swap Adjacent in LR String 0778. Swim in Rising Water 0779. K-th Symbol in Grammar 0780. Reaching Points 0781. Rabbits in Forest 0782. Transform to Chessboard 0783. Minimum Distance Between BST Nodes 0784. Letter Case Permutation 0785. Is Graph Bipartite?0786. K-th Smallest Prime Fraction 0787. Cheapest Flights Within K Stops 0788. Rotated Digits 0789. Escape The Ghosts 0790. Domino and Tromino Tiling 0791. Custom Sort String 0792. Number of Matching Subsequences 0793. Preimage Size of Factorial Zeroes Function 0794. Valid Tic-Tac-Toe State 0795. Number of Subarrays with Bounded Maximum 0796. Rotate String 0797. All Paths From Source to Target 0798. Smallest Rotation with Highest Score 0799. Champagne Tower 0800. Similar RGB Color 0801. Minimum Swaps To Make Sequences Increasing 0802. Find Eventual Safe States 0803. Bricks Falling When Hit 0804. Unique Morse Code Words 0805. Split Array With Same Average 0806. Number of Lines To Write String 0807. Max Increase to Keep City Skyline 0808. Soup Servings 0809. Expressive Words 0810. Chalkboard XOR Game 0811. Subdomain Visit Count 0812. Largest Triangle Area 0813. Largest Sum of Averages 0814. Binary Tree Pruning 0815. Bus Routes 0816. Ambiguous Coordinates 0817. Linked List Components 0818. Race Car 0819. Most Common Word 0820. Short Encoding of Words 0821. Shortest Distance to a Character 0822. Card Flipping Game 0823. Binary Trees With Factors 0824. Goat Latin 0825. Friends Of Appropriate Ages 0826. Most Profit Assigning Work 0827. Making A Large Island 0828. Count Unique Characters of All Substrings of a Given String 0829. Consecutive Numbers Sum 0830. Positions of Large Groups 0831. Masking Personal Information 0832. Flipping an Image 0833. Find And Replace in String 0834. Sum of Distances in Tree 0835. Image Overlap 0836. Rectangle Overlap 0837. New 21 Game 0838. Push Dominoes 0839. Similar String Groups 0840. Magic Squares In Grid 0841. Keys and Rooms 0842. Split Array into Fibonacci Sequence 0843. Guess the Word 0844. Backspace String Compare 0845. Longest Mountain in Array 0846. Hand of Straights 0847. Shortest Path Visiting All Nodes 0848. Shifting Letters 0849. Maximize Distance to Closest Person 0850. Rectangle Area II 0851. Loud and Rich 0852. Peak Index in a Mountain Array 0853. Car Fleet 0854. K-Similar Strings 0855. Exam Room 0856. Score of Parentheses 0857. Minimum Cost to Hire K Workers 0858. Mirror Reflection 0859. Buddy Strings 0860. Lemonade Change 0861. Score After Flipping Matrix 0862. Shortest Subarray with Sum at Least K 0863. All Nodes Distance K in Binary Tree 0864. Shortest Path to Get All Keys 0865. Smallest Subtree with all the Deepest Nodes 0866. Prime Palindrome 0867. Transpose Matrix 0868. Binary Gap 0869. Reordered Power of 2 0870. Advantage Shuffle 0871. Minimum Number of Refueling Stops 0872. Leaf-Similar Trees 0873. Length of Longest Fibonacci Subsequence 0874. Walking Robot Simulation 0875. Koko Eating Bananas 0876. Middle of the Linked List 0877. Stone Game 0878. Nth Magical Number 0879. Profitable Schemes 0880. Decoded String at Index 0881. Boats to Save People 0882. Reachable Nodes In Subdivided Graph 0883. Projection Area of 3D Shapes 0884. Uncommon Words from Two Sentences 0885. Spiral Matrix III 0886. Possible Bipartition 0887. Super Egg Drop 0888. Fair Candy Swap 0889. Construct Binary Tree from Preorder and Postorder Traversal 0890. Find and Replace Pattern 0891. Sum of Subsequence Widths 0892. Surface Area of 3D Shapes 0893. Groups of Special-Equivalent Strings 0894. All Possible Full Binary Trees 0895. Maximum Frequency Stack 0896. Monotonic Array 0897. Increasing Order Search Tree 0898. Bitwise ORs of Subarrays 0899. Orderly Queue 0900. RLE Iterator 0901. Online Stock Span 0902. Numbers At Most N Given Digit Set 0903. Valid Permutations for DI Sequence 0904. Fruit Into Baskets 0905. Sort Array By Parity 0906. Super Palindromes 0907. Sum of Subarray Minimums 0908. Smallest Range I 0909. Snakes and Ladders 0910. Smallest Range II 0911. Online Election 0912. Sort an Array 0913. Cat and Mouse 0914. X of a Kind in a Deck of Cards 0915. Partition Array into Disjoint Intervals 0916. Word Subsets 0917. Reverse Only Letters 0918. Maximum Sum Circular Subarray 0919. Complete Binary Tree Inserter 0920. Number of Music Playlists 0921. Minimum Add to Make Parentheses Valid 0922. Sort Array By Parity II 0923. 3Sum With Multiplicity 0924. Minimize Malware Spread 0925. Long Pressed Name 0926. Flip String to Monotone Increasing 0927. Three Equal Parts 0928. Minimize Malware Spread II 0929. Unique Email Addresses 0930. Binary Subarrays With Sum 0931. Minimum Falling Path Sum 0932. Beautiful Array 0933. Number of Recent Calls 0934. Shortest Bridge 0935. Knight Dialer 0936. Stamping The Sequence 0937. Reorder Data in Log Files 0938. Range Sum of BST 0939. Minimum Area Rectangle 0940. Distinct Subsequences II 0941. Valid Mountain Array 0942. DI String Match 0943. Find the Shortest Superstring 0944. Delete Columns to Make Sorted 0945. Minimum Increment to Make Array Unique 0946. Validate Stack Sequences 0947. Most Stones Removed with Same Row or Column 0948. Bag of Tokens 0949. Largest Time for Given Digits 0950. Reveal Cards In Increasing Order 0951. Flip Equivalent Binary Trees 0952. Largest Component Size by Common Factor 0953. Verifying an Alien Dictionary 0954. Array of Doubled Pairs 0955. Delete Columns to Make Sorted II 0956. Tallest Billboard 0957. Prison Cells After N Days 0958. Check Completeness of a Binary Tree 0959. Regions Cut By Slashes 0960. Delete Columns to Make Sorted III 0961. N-Repeated Element in Size 2N Array 0962. Maximum Width Ramp 0963. Minimum Area Rectangle II 0964. Least Operators to Express Number 0965. Univalued Binary Tree 0966. Vowel Spellchecker 0967. Numbers With Same Consecutive Differences 0968. Binary Tree Cameras 0969. Pancake Sorting 0970. Powerful Integers 0971. Flip Binary Tree To Match Preorder Traversal 0972. Equal Rational Numbers 0973. K Closest Points to Origin 0974. Subarray Sums Divisible by K 0975. Odd Even Jump 0976. Largest Perimeter Triangle 0977. Squares of a Sorted Array 0978. Longest Turbulent Subarray 0979. Distribute Coins in Binary Tree 0980. Unique Paths III 0981. Time Based Key-Value Store 0982. Triples with Bitwise AND Equal To Zero 0983. Minimum Cost For Tickets 0984. String Without AAA or BBB 0985. Sum of Even Numbers After Queries 0986. Interval List Intersections 0987. Vertical Order Traversal of a Binary Tree 0988. Smallest String Starting From Leaf 0989. Add to Array-Form of Integer 0990. Satisfiability of Equality Equations 0991. Broken Calculator 0992. Subarrays with K Different Integers 0993. Cousins in Binary Tree 0994. Rotting Oranges 0995. Minimum Number of K Consecutive Bit Flips 0996. Number of Squareful Arrays 0997. Find the Town Judge 0998. Maximum Binary Tree II 0999. Available Captures for Rook 1000. Minimum Cost to Merge Stones 1001. Grid Illumination 1002. Find Common Characters 1003. Check If Word Is Valid After Substitutions 1004. Max Consecutive Ones III 1005. Maximize Sum Of Array After K Negations 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 1012. Numbers With Repeated Digits 1013. Partition Array Into Three Parts With Equal Sum 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 1025. Divisor Game 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 1036. Escape a Large Maze 1037. Valid Boomerang 1038. Binary Search Tree to Greater Sum Tree 1039. Minimum Score Triangulation of Polygon 1040. Moving Stones Until Consecutive II 1041. Robot Bounded In Circle 1042. Flower Planting With No Adjacent 1043. Partition Array for Maximum Sum 1044. Longest Duplicate Substring 1045. Customers Who Bought All Products 1046. Last Stone Weight 1047. Remove All Adjacent Duplicates In String 1048. Longest String Chain 1049. Last Stone Weight II 1050. Actors and Directors Who Cooperated At Least Three Times 1051. Height Checker 1052. Grumpy Bookstore Owner 1053. Previous Permutation With One Swap 1054. Distant Barcodes 1055. Shortest Way to Form String 1056. Confusing Number 1057. Campus Bikes 1058. Minimize Rounding Error to Meet Target 1059. All Paths from Source Lead to Destination 1060. Missing Element in Sorted Array 1061. Lexicographically Smallest Equivalent String 1062. Longest Repeating Substring 1063. Number of Valid Subarrays 1064. Fixed Point 1065. Index Pairs of a String 1066. Campus Bikes II 1067. Digit Count in Range 1068. Product Sales Analysis I 1069. Product Sales Analysis II 1070. Product Sales Analysis III 1071. Greatest Common Divisor of Strings 1072. Flip Columns For Maximum Number of Equal Rows 1073. Adding Two Negabinary Numbers 1074. Number of Submatrices That Sum to Target 1075. Project Employees I 1076. Project Employees II 1077. Project Employees III 1078. Occurrences After Bigram 1079. Letter Tile Possibilities 1080. Insufficient Nodes in Root to Leaf Paths 1081. Smallest Subsequence of Distinct Characters 1082. Sales Analysis I 1083. Sales Analysis II 1084. Sales Analysis III 1085. Sum of Digits in the Minimum Number 1086. High Five 1087. Brace Expansion 1088. Confusing Number II 1089. Duplicate Zeros 1090. Largest Values From Labels 1091. Shortest Path in Binary Matrix 1092. Shortest Common Supersequence 1093. Statistics from a Large Sample 1094. Car Pooling 1095. Find in Mountain Array 1096. Brace Expansion II 1097. Game Play Analysis V 1098. Unpopular Books 1099. Two Sum Less Than K 1100. Find K-Length Substrings With No Repeated Characters 1101. The Earliest Moment When Everyone Become Friends 1102. Path With Maximum Minimum Value 1103. Distribute Candies to People 1104. Path In Zigzag Labelled Binary Tree 1105. Filling Bookcase Shelves 1106. Parsing A Boolean Expression 1107. New Users Daily Count 1108. Defanging an IP Address 1109. Corporate Flight Bookings 1110. Delete Nodes And Return Forest 1111. Maximum Nesting Depth of Two Valid Parentheses Strings 1112. Highest Grade For Each Student 1113. Reported Posts 1114. Print in Order 1115. Print FooBar Alternately 1116. Print Zero Even Odd 1117. Building H2O 1118. Number of Days in a Month 1119. Remove Vowels from a String 1120. Maximum Average Subtree 1121. Divide Array Into Increasing Sequences 1122. Relative Sort Array 1123. Lowest Common Ancestor of Deepest Leaves 1124. Longest Well-Performing Interval 1125. Smallest Sufficient Team 1126. Active Businesses 1127. User Purchase Platform 1128. Number of Equivalent Domino Pairs 1129. Shortest Path with Alternating Colors 1130. Minimum Cost Tree From Leaf Values 1131. Maximum of Absolute Value Expression 1132. Reported Posts II 1133. Largest Unique Number 1134. Armstrong Number 1135. Connecting Cities With Minimum Cost 1136. Parallel Courses 1137. N-th Tribonacci Number 1138. Alphabet Board Path 1139. Largest 1-Bordered Square 1140. Stone Game II 1141. User Activity for the Past 30 Days I 1142. User Activity for the Past 30 Days II 1143. Longest Common Subsequence 1144. Decrease Elements To Make Array Zigzag 1145. Binary Tree Coloring Game 1146. Snapshot Array 1147. Longest Chunked Palindrome Decomposition 1148. Article Views I 1149. Article Views II 1150. Check If a Number Is Majority Element in a Sorted Array 1151. Minimum Swaps to Group All 1's Together 1152. Analyze User Website Visit Pattern 1153. String Transforms Into Another String 1154. Day of the Year 1155. Number of Dice Rolls With Target Sum 1156. Swap For Longest Repeated Character Substring 1157. Online Majority Element In Subarray 1158. Market Analysis I 1159. Market Analysis II 1160. Find Words That Can Be Formed by Characters 1161. Maximum Level Sum of a Binary Tree 1162. As Far from Land as Possible 1163. Last Substring in Lexicographical Order 1164. Product Price at a Given Date 1165. Single-Row Keyboard 1166. Design File System 1167. Minimum Cost to Connect Sticks 1168. Optimize Water Distribution in a Village 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 1173. Immediate Food Delivery I 1174. Immediate Food Delivery II 1175. Prime Arrangements 1176. Diet Plan Performance 1177. Can Make Palindrome from Substring 1178. Number of Valid Words for Each Puzzle 1179. Reformat Department Table 1180. Count Substrings with Only One Distinct Letter 1181. Before and After Puzzle 1182. Shortest Distance to Target Color 1183. Maximum Number of Ones 1184. Distance Between Bus Stops 1185. Day of the Week 1186. Maximum Subarray Sum with One Deletion 1187. Make Array Strictly Increasing 1188. Design Bounded Blocking Queue 1189. Maximum Number of Balloons 1190. Reverse Substrings Between Each Pair of Parentheses 1191. K-Concatenation Maximum Sum 1192. Critical Connections in a Network 1193. Monthly Transactions I 1194. Tournament Winners 1195. Fizz Buzz Multithreaded 1196. How Many Apples Can You Put into the Basket 1197. Minimum Knight Moves 1198. Find Smallest Common Element in All Rows 1199. Minimum Time to Build Blocks 1200. Minimum Absolute Difference 1201. Ugly Number III 1202. Smallest String With Swaps 1203. Sort Items by Groups Respecting Dependencies 1204. Last Person to Fit in the Bus 1205. Monthly Transactions II 1206. Design Skiplist 1207. Unique Number of Occurrences 1208. Get Equal Substrings Within Budget 1209. Remove All Adjacent Duplicates in String II 1210. Minimum Moves to Reach Target with Rotations 1211. Queries Quality and Percentage 1212. Team Scores in Football Tournament 1213. Intersection of Three Sorted Arrays 1214. Two Sum BSTs 1215. Stepping Numbers 1216. Valid Palindrome III 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 1221. Split a String in Balanced Strings 1222. Queens That Can Attack the King 1223. Dice Roll Simulation 1224. Maximum Equal Frequency 1225. Report Contiguous Dates 1226. The Dining Philosophers 1227. Airplane Seat Assignment Probability 1228. Missing Number In Arithmetic Progression 1229. Meeting Scheduler 1230. Toss Strange Coins 1231. Divide Chocolate 1232. Check If It Is a Straight Line 1233. Remove Sub-Folders from the Filesystem 1234. Replace the Substring for Balanced String 1235. Maximum Profit in Job Scheduling 1236. Web Crawler 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 1240. Tiling a Rectangle with the Fewest Squares 1241. Number of Comments per Post 1242. Web Crawler Multithreaded 1243. Array Transformation 1244. Design A Leaderboard 1245. Tree Diameter 1246. Palindrome Removal 1247. Minimum Swaps to Make Strings Equal 1248. Count Number of Nice Subarrays 1249. Minimum Remove to Make Valid Parentheses 1250. Check If It Is a Good Array 1251. Average Selling Price 1252. Cells with Odd Values in a Matrix 1253. Reconstruct a 2-Row Binary Matrix 1254. Number of Closed Islands 1255. Maximum Score Words Formed by Letters 1256. Encode Number 1257. Smallest Common Region 1258. Synonymous Sentences 1259. Handshakes That Don't Cross 1260. Shift 2D Grid 1261. Find Elements in a Contaminated Binary Tree 1262. Greatest Sum Divisible by Three 1263. Minimum Moves to Move a Box to Their Target Location 1264. Page Recommendations 1265. Print Immutable Linked List in Reverse 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 1270. All People Report to the Given Manager 1271. Hexspeak 1272. Remove Interval 1273. Delete Tree Nodes 1274. Number of Ships in a Rectangle 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 1278. Palindrome Partitioning III 1279. Traffic Light Controlled Intersection 1280. Students and Examinations 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 1284. Minimum Number of Flips to Convert Binary Matrix to Zero Matrix 1285. Find the Start and End Number of Continuous Ranges 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 1294. Weather Type in Each Country 1295. Find Numbers with Even Number of Digits 1296. Divide Array in Sets of K Consecutive Numbers 1297. Maximum Number of Occurrences of a Substring 1298. Maximum Candies You Can Get from Boxes 1299. Replace Elements with Greatest Element on Right Side 1300. Sum of Mutated Array Closest to Target 1301. Number of Paths with Max Score 1302. Deepest Leaves Sum 1303. Find the Team Size 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 1308. Running Total for Different Genders 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 1313. Decompress Run-Length Encoded List 1314. Matrix Block Sum 1315. Sum of Nodes with Even-Valued Grandparent 1316. Distinct Echo Substrings 1317. Convert Integer to the Sum of Two No-Zero Integers 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 1321. Restaurant Growth 1322. Ads Performance 1323. Maximum 69 Number 1324. Print Words Vertically 1325. Delete Leaves With a Given Value 1326. Minimum Number of Taps to Open to Water a Garden 1327. List the Products Ordered in a Period 1328. Break a Palindrome 1329. Sort the Matrix Diagonally 1330. Reverse Subarray To Maximize Array Value 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 1336. Number of Transactions per Visit 1337. The K Weakest Rows in a Matrix 1338. Reduce Array Size to The Half 1339. Maximum Product of Splitted Binary Tree 1340. Jump Game V 1341. Movie Rating 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 1346. Check If N and Its Double Exist 1347. Minimum Number of Steps to Make Two Strings Anagram 1348. Tweet Counts Per Frequency 1349. Maximum Students Taking Exam 1350. Students With Invalid Departments 1351. Count Negative Numbers in a Sorted Matrix 1352. Product of the Last K Numbers 1353. Maximum Number of Events That Can Be Attended 1354. Construct Target Array With Multiple Sums 1355. Activity Participants 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 1364. Number of Trusted Contacts of a Customer 1365. How Many Numbers Are Smaller Than the Current Number 1366. Rank Teams by Votes 1367. Linked List in Binary Tree 1368. Minimum Cost to Make at Least One Valid Path in a Grid 1369. Get the Second Most Recent Activity 1370. Increasing Decreasing String 1371. Find the Longest Substring Containing Vowels in Even Counts 1372. Longest ZigZag Path in a Binary Tree 1373. Maximum Sum BST in Binary Tree 1374. Generate a String With Characters That Have Odd Counts 1375. Bulb Switcher III 1376. Time Needed to Inform All Employees 1377. Frog Position After T Seconds 1378. Replace Employee ID With The Unique Identifier 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 1384. Total Sales Amount by Year 1385. Find the Distance Value Between Two Arrays 1386. Cinema Seat Allocation 1387. Sort Integers by The Power Value 1388. Pizza With 3n Slices 1389. Create Target Array in the Given Order 1390. Four Divisors 1391. Check if There is a Valid Path in a Grid 1392. Longest Happy Prefix 1393. Capital Gain/Loss 1394. Find Lucky Integer in an Array 1395. Count Number of Teams 1396. Design Underground System 1397. Find All Good Strings 1398. Customers Who Bought Products A and B but Not C 1399. Count Largest Group 1400. Construct K Palindrome Strings 1401. Circle and Rectangle Overlapping 1402. Reducing Dishes 1403. Minimum Subsequence in Non-Increasing Order 1404. Number of Steps to Reduce a Number in Binary Representation to One 1405. Longest Happy String 1406. Stone Game III 1407. Top Travellers 1408. String Matching in an Array 1409. Queries on a Permutation With Key 1410. HTML Entity Parser 1411. Number of Ways to Paint N × 3 Grid 1412. Find the Quiet Students in All Exams 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 1421. NPV Queries 1422. Maximum Score After Splitting a String 1423. Maximum Points You Can Obtain from Cards 1424. Diagonal Traverse II 1425. Constrained Subsequence Sum 1426. Counting Elements 1427. Perform String Shifts 1428. Leftmost Column with at Least a One 1429. First Unique Number 1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree 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 1434. Number of Ways to Wear Different Hats to Each Other 1435. Create a Session Bar Chart 1436. Destination City 1437. Check If All 1's Are at Least Length K Places Away 1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit 1439. Find the Kth Smallest Sum of a Matrix With Sorted Rows 1440. Evaluate Boolean Expression 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 1444. Number of Ways of Cutting a Pizza 1445. Apples & Oranges 1446. Consecutive Characters 1447. Simplified Fractions 1448. Count Good Nodes in Binary Tree 1449. Form Largest Integer With Digits That Add up to Target 1450. Number of Students Doing Homework at a Given Time 1451. Rearrange Words in a Sentence 1452. People Whose List of Favorite Companies Is Not a Subset of Another List 1453. Maximum Number of Darts Inside of a Circular Dartboard 1454. Active Users 1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence 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 1459. Rectangles Area 1460. Make Two Arrays Equal by Reversing Sub-arrays 1461. Check If a String Contains All Binary Codes of Size K 1462. Course Schedule IV 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 1467. Probability of a Two Boxes Having The Same Number of Distinct Balls 1468. Calculate Salaries 1469. Find All The Lonely Nodes 1470. Shuffle the Array 1471. The k Strongest Values in an Array 1472. Design Browser History 1473. Paint House III 1474. Delete N Nodes After M Nodes of a Linked List 1475. Final Prices With a Special Discount in a Shop 1476. Subrectangle Queries 1477. Find Two Non-overlapping Sub-arrays Each With Target Sum 1478. Allocate Mailboxes 1479. Sales by Day of the Week 1480. Running Sum of 1d Array 1481. Least Number of Unique Integers after K Removals 1482. Minimum Number of Days to Make m Bouquets 1483. Kth Ancestor of a Tree Node 1484. Group Sold Products By The Date 1485. Clone Binary Tree With Random Pointer 1486. XOR Operation in an Array 1487. Making File Names Unique 1488. Avoid Flood in The City 1489. Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree 1490. Clone N-ary Tree 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 1494. Parallel Courses II 1495. Friendly Movies Streamed Last Month 1496. Path Crossing 1497. Check If Array Pairs Are Divisible by k 1498. Number of Subsequences That Satisfy the Given Sum Condition 1499. Max Value of Equation 1500. Design a File Sharing System 1501. Countries You Can Safely Invest In 1502. Can Make Arithmetic Progression From Sequence 1503. Last Moment Before All Ants Fall Out of a Plank 1504. Count Submatrices With All Ones 1505. Minimum Possible Integer After at Most K Adjacent Swaps On Digits 1506. Find Root of N-Ary Tree 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 1511. Customer Order Frequency 1512. Number of Good Pairs 1513. Number of Substrings With Only 1s 1514. Path with Maximum Probability 1515. Best Position for a Service Centre 1516. Move Sub-Tree of N-Ary Tree 1517. Find Users With Valid E-Mails 1518. Water Bottles 1519. Number of Nodes in the Sub-Tree With the Same Label 1520. Maximum Number of Non-Overlapping Substrings 1521. Find a Value of a Mysterious Function Closest to Target 1522. Diameter of N-Ary Tree 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 1526. Minimum Number of Increments on Subarrays to Form a Target Array 1527. Patients With a Condition 1528. Shuffle String 1529. Bulb Switcher IV 1530. Number of Good Leaf Nodes Pairs 1531. String Compression II 1532. The Most Recent Three Orders 1533. Find the Index of the Large Integer 1534. Count Good Triplets 1535. Find the Winner of an Array Game 1536. Minimum Swaps to Arrange a Binary Grid 1537. Get the Maximum Score 1538. Guess the Majority in a Hidden Array 1539. Kth Missing Positive Number 1540. Can Convert String in K Moves 1541. Minimum Insertions to Balance a Parentheses String 1542. Find Longest Awesome Substring 1543. Fix Product Name Format 1544. Make The String Great 1545. Find Kth Bit in Nth Binary String 1546. Maximum Number of Non-Overlapping Subarrays With Sum Equals Target 1547. Minimum Cost to Cut a Stick 1548. The Most Similar Path in a Graph 1549. The Most Recent Orders for Each Product 1550. Three Consecutive Odds 1551. Minimum Operations to Make Array Equal 1552. Magnetic Force Between Two Balls 1553. Minimum Number of Days to Eat N Oranges 1554. Strings Differ by One Character 1555. Bank Account Summary 1556. Thousand Separator 1557. Minimum Number of Vertices to Reach All Nodes 1558. Minimum Numbers of Function Calls to Make Target Array 1559. Detect Cycles in 2D Grid 1560. Most Visited Sector in a Circular Track 1561. Maximum Number of Coins You Can Get 1562. Find Latest Group of Size M 1563. Stone Game V 1564. Put Boxes Into the Warehouse I 1565. Unique Orders and Customers Per Month 1566. Detect Pattern of Length M Repeated K or More Times 1567. Maximum Length of Subarray With Positive Product 1568. Minimum Number of Days to Disconnect Island 1569. Number of Ways to Reorder Array to Get Same BST 1570. Dot Product of Two Sparse Vectors 1571. Warehouse Manager 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 1576. Replace All ?'s to Avoid Consecutive Repeating Characters 1577. Number of Ways Where Square of Number Is Equal to Product of Two Numbers 1578. Minimum Deletion Cost to Avoid Repeating Letters 1579. Remove Max Number of Edges to Keep Graph Fully Traversable 1580. Put Boxes Into the Warehouse II 1581. Customer Who Visited but Did Not Make Any Transactions 1582. Special Positions in a Binary Matrix 1583. Count Unhappy Friends 1584. Min Cost to Connect All Points 1585. Check If String Is Transformable With Substring Sort Operations 1586. Binary Search Tree Iterator II 1587. Bank Account Summary II 1588. Sum of All Odd Length Subarrays 1589. Maximum Sum Obtained of Any Permutation 1590. Make Sum Divisible by P 1591. Strange Printer II 1592. Rearrange Spaces Between Words 1593. Split a String Into the Max Number of Unique Substrings 1594. Maximum Non Negative Product in a Matrix 1595. Minimum Cost to Connect Two Groups of Points 1596. The Most Frequently Ordered Products for Each Customer 1597. Build Binary Expression Tree From Infix Expression 1598. Crawler Log Folder 1599. Maximum Profit of Operating a Centennial Wheel 1600. Throne Inheritance 1601. Maximum Number of Achievable Transfer Requests 1602. Find Nearest Right Node in Binary Tree 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 1606. Find Servers That Handled Most Number of Requests 1607. Sellers With No Sales 1608. Special Array With X Elements Greater Than or Equal X 1609. Even Odd Tree 1610. Maximum Number of Visible Points 1611. Minimum One Bit Operations to Make Integers Zero 1612. Check If Two Expression Trees are Equivalent 1613. Find the Missing IDs 1614. Maximum Nesting Depth of the Parentheses 1615. Maximal Network Rank 1616. Split Two Strings to Make Palindrome 1617. Count Subtrees With Max Distance Between Cities 1618. Maximum Font to Fit a Sentence in a Screen 1619. Mean of Array After Removing Some Elements 1620. Coordinate With Maximum Network Quality 1621. Number of Sets of K Non-Overlapping Line Segments 1622. Fancy Sequence 1623. All Valid Triplets That Can Represent a Country 1624. Largest Substring Between Two Equal Characters 1625. Lexicographically Smallest String After Applying Operations 1626. Best Team With No Conflicts 1627. Graph Connectivity With Threshold 1628. Design an Expression Tree With Evaluate Function 1629. Slowest Key 1630. Arithmetic Subarrays 1631. Path With Minimum Effort 1632. Rank Transform of a Matrix 1633. Percentage of Users Attended a Contest 1634. Add Two Polynomials Represented as Linked Lists 1635. Hopper Company Queries I 1636. Sort Array by Increasing Frequency 1637. Widest Vertical Area Between Two Points Containing No Points 1638. Count Substrings That Differ by One Character 1639. Number of Ways to Form a Target String Given a Dictionary 1640. Check Array Formation Through Concatenation 1641. Count Sorted Vowel Strings 1642. Furthest Building You Can Reach 1643. Kth Smallest Instructions 1644. Lowest Common Ancestor of a Binary Tree II 1645. Hopper Company Queries II 1646. Get Maximum in Generated Array 1647. Minimum Deletions to Make Character Frequencies Unique 1648. Sell Diminishing-Valued Colored Balls 1649. Create Sorted Array through Instructions 1650. Lowest Common Ancestor of a Binary Tree III 1651. Hopper Company Queries III 1652. Defuse the Bomb 1653. Minimum Deletions to Make String Balanced 1654. Minimum Jumps to Reach Home 1655. Distribute Repeating Integers 1656. Design an Ordered Stream 1657. Determine if Two Strings Are Close 1658. Minimum Operations to Reduce X to Zero 1659. Maximize Grid Happiness 1660. Correct a Binary Tree 1661. Average Time of Process per Machine 1662. Check If Two String Arrays are Equivalent 1663. Smallest String With A Given Numeric Value 1664. Ways to Make a Fair Array 1665. Minimum Initial Energy to Finish Tasks 1666. Change the Root of a Binary Tree 1667. Fix Names in a Table 1668. Maximum Repeating Substring 1669. Merge In Between Linked Lists 1670. Design Front Middle Back Queue 1671. Minimum Number of Removals to Make Mountain Array 1672. Richest Customer Wealth 1673. Find the Most Competitive Subsequence 1674. Minimum Moves to Make Array Complementary 1675. Minimize Deviation in Array 1676. Lowest Common Ancestor of a Binary Tree IV 1677. Product's Worth Over Invoices 1678. Goal Parser Interpretation 1679. Max Number of K-Sum Pairs 1680. Concatenation of Consecutive Binary Numbers 1681. Minimum Incompatibility 1682. Longest Palindromic Subsequence II 1683. Invalid Tweets 1684. Count the Number of Consistent Strings 1685. Sum of Absolute Differences in a Sorted Array 1686. Stone Game VI 1687. Delivering Boxes from Storage to Ports 1688. Count of Matches in Tournament 1689. Partitioning Into Minimum Number Of Deci-Binary Numbers 1690. Stone Game VII 1691. Maximum Height by Stacking Cuboids 1692. Count Ways to Distribute Candies 1693. Daily Leads and Partners 1694. Reformat Phone Number 1695. Maximum Erasure Value 1696. Jump Game VI 1697. Checking Existence of Edge Length Limited Paths 1698. Number of Distinct Substrings in a String 1699. Number of Calls Between Two Persons 1700. Number of Students Unable to Eat Lunch 1701. Average Waiting Time 1702. Maximum Binary String After Change 1703. Minimum Adjacent Swaps for K Consecutive Ones 1704. Determine if String Halves Are Alike 1705. Maximum Number of Eaten Apples 1706. Where Will the Ball Fall 1707. Maximum XOR With an Element From Array 1708. Largest Subarray Length K 1709. Biggest Window Between Visits 1710. Maximum Units on a Truck 1711. Count Good Meals 1712. Ways to Split Array Into Three Subarrays 1713. Minimum Operations to Make a Subsequence 1714. Sum Of Special Evenly-Spaced Elements In Array 1715. Count Apples and Oranges 1716. Calculate Money in Leetcode Bank 1717. Maximum Score From Removing Substrings 1718. Construct the Lexicographically Largest Valid Sequence 1719. Number Of Ways To Reconstruct A Tree 1720. Decode XORed Array 1721. Swapping Nodes in a Linked List 1722. Minimize Hamming Distance After Swap Operations 1723. Find Minimum Time to Finish All Jobs 1724. Checking Existence of Edge Length Limited Paths II 1725. Number Of Rectangles That Can Form The Largest Square 1726. Tuple with Same Product 1727. Largest Submatrix With Rearrangements 1728. Cat and Mouse II 1729. Find Followers Count 1730. Shortest Path to Get Food 1731. The Number of Employees Which Report to Each Employee 1732. Find the Highest Altitude 1733. Minimum Number of People to Teach 1734. Decode XORed Permutation 1735. Count Ways to Make Array With Product 1736. Latest Time by Replacing Hidden Digits 1737. Change Minimum Characters to Satisfy One of Three Conditions 1738. Find Kth Largest XOR Coordinate Value 1739. Building Boxes 1740. Find Distance in a Binary Tree 1741. Find Total Time Spent by Each Employee 1742. Maximum Number of Balls in a Box 1743. Restore the Array From Adjacent Pairs 1744. Can You Eat Your Favorite Candy on Your Favorite Day?1745. Palindrome Partitioning IV 1746. Maximum Subarray Sum After One Operation 1747. Leetflex Banned Accounts 1748. Sum of Unique Elements 1749. Maximum Absolute Sum of Any Subarray 1750. Minimum Length of String After Deleting Similar Ends 1751. Maximum Number of Events That Can Be Attended II 1752. Check if Array Is Sorted and Rotated 1753. Maximum Score From Removing Stones 1754. Largest Merge Of Two Strings 1755. Closest Subsequence Sum 1756. Design Most Recently Used Queue 1757. Recyclable and Low Fat Products 1758. Minimum Changes To Make Alternating Binary String 1759. Count Number of Homogenous Substrings 1760. Minimum Limit of Balls in a Bag 1761. Minimum Degree of a Connected Trio in a Graph 1762. Buildings With an Ocean View 1763. Longest Nice Substring 1764. Form Array by Concatenating Subarrays of Another Array 1765. Map of Highest Peak 1766. Tree of Coprimes 1767. Find the Subtasks That Did Not Execute 1768. Merge Strings Alternately 1769. Minimum Number of Operations to Move All Balls to Each Box 1770. Maximum Score from Performing Multiplication Operations 1771. Maximize Palindrome Length From Subsequences 1772. Sort Features by Popularity 1773. Count Items Matching a Rule 1774. Closest Dessert Cost 1775. Equal Sum Arrays With Minimum Number of Operations 1776. Car Fleet II 1777. Product's Price for Each Store 1778. Shortest Path in a Hidden Grid 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 1782. Count Pairs Of Nodes 1783. Grand Slam Titles 1784. Check if Binary String Has at Most One Segment of Ones 1785. Minimum Elements to Add to Form a Given Sum 1786. Number of Restricted Paths From First to Last Node 1787. Make the XOR of All Segments Equal to Zero 1788. Maximize the Beauty of the Garden 1789. Primary Department for Each Employee 1790. Check if One String Swap Can Make Strings Equal 1791. Find Center of Star Graph 1792. Maximum Average Pass Ratio 1793. Maximum Score of a Good Subarray 1794. Count Pairs of Equal Substrings With Minimum Difference 1795. Rearrange Products Table 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 1802. Maximum Value at a Given Index in a Bounded Array 1803. Count Pairs With XOR in a Range 1804. Implement Trie II (solutions/Prefix Tree)1805. Number of Different Integers in a String 1806. Minimum Number of Operations to Reinitialize a Permutation 1807. Evaluate the Bracket Pairs of a String 1808. Maximize Number of Nice Divisors 1809. Ad-Free Sessions 1810. Minimum Path Cost in a Hidden Grid 1811. Find Interview Candidates 1812. Determine Color of a Chessboard Square 1813. Sentence Similarity III 1814. Count Nice Pairs in an Array 1815. Maximum Number of Groups Getting Fresh Donuts 1816. Truncate Sentence 1817. Finding the Users Active Minutes 1818. Minimum Absolute Sum Difference 1819. Number of Different Subsequences GCDs 1820. Maximum Number of Accepted Invitations 1821. Find Customers With Positive Revenue this Year 1822. Sign of the Product of an Array 1823. Find the Winner of the Circular Game 1824. Minimum Sideway Jumps 1825. Finding MK Average 1826. Faulty Sensor 1827. Minimum Operations to Make the Array Increasing 1828. Queries on Number of Points Inside a Circle 1829. Maximum XOR for Each Query 1830. Minimum Number of Operations to Make String Sorted 1831. Maximum Transaction Each Day 1832. Check if the Sentence Is Pangram 1833. Maximum Ice Cream Bars 1834. Single-Threaded CPU 1835. Find XOR Sum of All Pairs Bitwise AND 1836. Remove Duplicates From an Unsorted Linked List 1837. Sum of Digits in Base K 1838. Frequency of the Most Frequent Element 1839. Longest Substring Of All Vowels in Order 1840. Maximum Building Height 1841. League Statistics 1842. Next Palindrome Using Same Digits 1843. Suspicious Bank Accounts 1844. Replace All Digits with Characters 1845. Seat Reservation Manager 1846. Maximum Element After Decreasing and Rearranging 1847. Closest Room 1848. Minimum Distance to the Target Element 1849. Splitting a String Into Descending Consecutive Values 1850. Minimum Adjacent Swaps to Reach the Kth Smallest Number 1851. Minimum Interval to Include Each Query 1852. Distinct Numbers in Each Subarray 1853. Convert Date Format 1854. Maximum Population Year 1855. Maximum Distance Between a Pair of Values 1856. Maximum Subarray Min-Product 1857. Largest Color Value in a Directed Graph 1858. Longest Word With All Prefixes 1859. Sorting the Sentence 1860. Incremental Memory Leak 1861. Rotating the Box 1862. Sum of Floored Pairs 1863. Sum of All Subset XOR Totals 1864. Minimum Number of Swaps to Make the Binary String Alternating 1865. Finding Pairs With a Certain Sum 1866. Number of Ways to Rearrange Sticks With K Sticks Visible 1867. Orders With Maximum Quantity Above Average 1868. Product of Two Run-Length Encoded Arrays 1869. Longer Contiguous Segments of Ones than Zeros 1870. Minimum Speed to Arrive on Time 1871. Jump Game VII 1872. Stone Game VIII 1873. Calculate Special Bonus 1874. Minimize Product Sum of Two Arrays 1875. Group Employees of the Same Salary 1876. Substrings of Size Three with Distinct Characters 1877. Minimize Maximum Pair Sum in Array 1878. Get Biggest Three Rhombus Sums in a Grid 1879. Minimum XOR Sum of Two Arrays 1880. Check if Word Equals Summation of Two Words 1881. Maximum Value after Insertion 1882. Process Tasks Using Servers 1883. Minimum Skips to Arrive at Meeting On Time 1884. Egg Drop With 2 Eggs and N Floors 1885. Count Pairs in Two Arrays 1886. Determine Whether Matrix Can Be Obtained By Rotation 1887. Reduction Operations to Make the Array Elements Equal 1888. Minimum Number of Flips to Make the Binary String Alternating 1889. Minimum Space Wasted From Packaging 1890. The Latest Login in 2020 1891. Cutting Ribbons 1892. Page Recommendations II 1893. Check if All the Integers in a Range Are Covered 1894. Find the Student that Will Replace the Chalk 1895. Largest Magic Square 1896. Minimum Cost to Change the Final Value of Expression 1897. Redistribute Characters to Make All Strings Equal 1898. Maximum Number of Removable Characters 1899. Merge Triplets to Form Target Triplet 1900. The Earliest and Latest Rounds Where Players Compete 1901. Find a Peak Element II 1902. Depth of BST Given Insertion Order 1903. Largest Odd Number in String 1904. The Number of Full Rounds You Have Played 1905. Count Sub Islands 1906. Minimum Absolute Difference Queries 1907. Count Salary Categories 1908. Game of Nim 1909. Remove One Element to Make the Array Strictly Increasing 1910. Remove All Occurrences of a Substring 1911. Maximum Alternating Subsequence Sum 1912. Design Movie Rental System 1913. Maximum Product Difference Between Two Pairs 1914. Cyclically Rotating a Grid 1915. Number of Wonderful Substrings 1916. Count Ways to Build Rooms in an Ant Colony 1917. Leetcodify Friends Recommendations 1918. Kth Smallest Subarray Sum 1919. Leetcodify Similar Friends 1920. Build Array from Permutation 1921. Eliminate Maximum Number of Monsters 1922. Count Good Numbers 1923. Longest Common Subpath 1924. Erect the Fence II 1925. Count Square Sum Triples 1926. Nearest Exit from Entrance in Maze 1927. Sum Game 1928. Minimum Cost to Reach Destination in Time 1929. Concatenation of Array 1930. Unique Length-3 Palindromic Subsequences 1931. Painting a Grid With Three Different Colors 1932. Merge BSTs to Create Single BST 1933. Check if String Is Decomposable Into Value-Equal Substrings 1934. Confirmation Rate 1935. Maximum Number of Words You Can Type 1936. Add Minimum Number of Rungs 1937. Maximum Number of Points with Cost 1938. Maximum Genetic Difference Query 1939. Users That Actively Request Confirmation Messages 1940. Longest Common Subsequence Between Sorted Arrays 1941. Check if All Characters Have Equal Number of Occurrences 1942. The Number of the Smallest Unoccupied Chair 1943. Describe the Painting 1944. Number of Visible People in a Queue 1945. Sum of Digits of String After Convert 1946. Largest Number After Mutating Substring 1947. Maximum Compatibility Score Sum 1948. Delete Duplicate Folders in System 1949. Strong Friendship 1950. Maximum of Minimum Values in All Subarrays 1951. All the Pairs With the Maximum Number of Common Followers 1952. Three Divisors 1953. Maximum Number of Weeks for Which You Can Work 1954. Minimum Garden Perimeter to Collect Enough Apples 1955. Count Number of Special Subsequences 1956. Minimum Time For K Virus Variants to Spread 1957. Delete Characters to Make Fancy String 1958. Check if Move is Legal 1959. Minimum Total Space Wasted With K Resizing Operations 1960. Maximum Product of the Length of Two Palindromic Substrings 1961. Check If String Is a Prefix of Array 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 1965. Employees With Missing Information 1966. Binary Searchable Numbers in an Unsorted Array 1967. Number of Strings That Appear as Substrings in Word 1968. Array With Elements Not Equal to Average of Neighbors 1969. Minimum Non-Zero Product of the Array Elements 1970. Last Day Where You Can Still Cross 1971. Find if Path Exists in Graph 1972. First and Last Call On the Same Day 1973. Count Nodes Equal to Sum of Descendants 1974. Minimum Time to Type Word Using Special Typewriter 1975. Maximum Matrix Sum 1976. Number of Ways to Arrive at Destination 1977. Number of Ways to Separate Numbers 1978. Employees Whose Manager Left the Company 1979. Find Greatest Common Divisor of Array 1980. Find Unique Binary String 1981. Minimize the Difference Between Target and Chosen Elements 1982. Find Array Given Subset Sums 1983. Widest Pair of Indices With Equal Range Sum 1984. Minimum Difference Between Highest and Lowest of K Scores 1985. Find the Kth Largest Integer in the Array 1986. Minimum Number of Work Sessions to Finish the Tasks 1987. Number of Unique Good Subsequences 1988. Find Cutoff Score for Each School 1989. Maximum Number of People That Can Be Caught in Tag 1990. Count the Number of Experiments 1991. Find the Middle Index in Array 1992. Find All Groups of Farmland 1993. Operations on Tree 1994. The Number of Good Subsets 1995. Count Special Quadruplets 1996. The Number of Weak Characters in the Game 1997. First Day Where You Have Been in All the Rooms 1998. GCD Sort of an Array 1999. Smallest Greater Multiple Made of Two Digits 2000. Reverse Prefix of Word 2001. Number of Pairs of Interchangeable Rectangles 2002. Maximum Product of the Length of Two Palindromic Subsequences 2003. Smallest Missing Genetic Value in Each Subtree 2004. The Number of Seniors and Juniors to Join the Company 2005. Subtree Removal Game with Fibonacci Tree 2006. Count Number of Pairs With Absolute Difference K 2007. Find Original Array From Doubled Array 2008. Maximum Earnings From Taxi 2009. Minimum Number of Operations to Make Array Continuous 2010. The Number of Seniors and Juniors to Join the Company II 2011. Final Value of Variable After Performing Operations 2012. Sum of Beauty in the Array 2013. Detect Squares 2014. Longest Subsequence Repeated k Times 2015. Average Height of Buildings in Each Segment 2016. Maximum Difference Between Increasing Elements 2017. Grid Game 2018. Check if Word Can Be Placed In Crossword 2019. The Score of Students Solving Math Expression

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