All Classes

Class	Description
Allocator	2502 - Design Memory Allocator.
AllOne	432 - All O`one Data Structure.
ATM	2241 - Design an ATM Machine.
AuthenticationManager	1797 - Design Authentication Manager.
Bank	2043 - Simple Bank System.
Bitset	2166 - Design Bitset.
BookMyShow	2286 - Booking Concert Tickets in Groups.
BrowserHistory	1472 - Design Browser History.
BSTIterator	173 - Binary Search Tree Iterator.
Cashier	1357 - Apply Discount Every n Orders.
CBTInserter	919 - Complete Binary Tree Inserter.
Codec	297 - Serialize and Deserialize Binary Tree.
Codec	449 - Serialize and Deserialize BST.
Codec	535 - Encode and Decode TinyURL.
CombinationIterator	1286 - Iterator for Combination.
CountIntervals	2276 - Count Integers in Intervals.
CustomStack	1381 - Design a Stack With Increment Operation.
DetectSquares	2013 - Detect Squares.
DiningPhilosophers	1226 - The Dining Philosophers.
DinnerPlates	1172 - Dinner Plate Stacks.
Employee
Encrypter	2227 - Encrypt and Decrypt Strings.
ExamRoom	855 - Exam Room.
Fancy	1622 - Fancy Sequence.
FindElements	1261 - Find Elements in a Contaminated Binary Tree.
FindSumPairs	1865 - Finding Pairs With a Certain Sum.
FizzBuzz	1195 - Fizz Buzz Multithreaded.
Foo	1114 - Print in Order.
FooBar	1115 - Print FooBar Alternately.
FoodRatings	2353 - Design a Food Rating System.
FreqStack	895 - Maximum Frequency Stack.
FrontMiddleBackQueue	1670 - Design Front Middle Back Queue.
H2O	1117 - Building H2O.
H2O.HydrogenRunnable
H2O.OxygenRunnable
KthLargest	703 - Kth Largest Element in a Stream.
LFUCache	460 - LFU Cache.
ListNode
LockingTree	1993 - Operations on Tree.
LRUCache	146 - LRU Cache.
LUPrefix	2424 - Longest Uploaded Prefix.
MagicDictionary	676 - Implement Magic Dictionary.
MajorityChecker	1157 - Online Majority Element In Subarray.
MapSum	677 - Map Sum Pairs.
MedianFinder	295 - Find Median from Data Stream.
MinStack	155 - Min Stack.
MKAverage	1825 - Finding MK Average.
MovieRentingSystem	1912 - Design Movie Rental System.
MyCalendar	729 - My Calendar I.
MyCalendarThree	732 - My Calendar III.
MyCalendarTwo	731 - My Calendar II.
MyCircularDeque	641 - Design Circular Deque.
MyCircularQueue	622 - Design Circular Queue.
MyHashMap	706 - Design HashMap.
MyHashSet	705 - Design HashSet.
MyLinkedList	707 - Design Linked List.
MyQueue	232 - Implement Queue using Stacks.
MyStack	225 - Implement Stack using Queues.
NestedInteger
NestedIterator	341 - Flatten Nested List Iterator.
Node
Node
Node
Node	427 - Construct Quad Tree.
Node	430 - Flatten a Multilevel Doubly Linked List.
Node	558 - Logical OR of Two Binary Grids Represented as Quad-Trees.
NumArray	303 - Range Sum Query - Immutable.
NumArray	307 - Range Sum Query - Mutable.
NumberContainers	2349 - Design a Number Container System.
NumMatrix	304 - Range Sum Query 2D - Immutable.
OrderedStream	1656 - Design an Ordered Stream.
ParkingSystem	1603 - Design Parking System.
PeekingIterator	284 - Peeking Iterator.
ProductOfNumbers	1352 - Product of the Last K Numbers.
RandomizedCollection	381 - Insert Delete GetRandom O(1) - Duplicates allowed.
RandomizedSet	380 - Insert Delete GetRandom O(1).
RangeFreqQuery	2080 - Range Frequency Queries.
RangeModule	715 - Range Module.
RecentCounter	933 - Number of Recent Calls.
RLEIterator	900 - RLE Iterator.
Robot	2069 - Walking Robot Simulation II.
SeatManager	1845 - Seat Reservation Manager.
Skiplist	1206 - Design Skiplist.
SmallestInfiniteSet	2336 - Smallest Number in Infinite Set.
SnapshotArray	1146 - Snapshot Array.
Solution	1 - Two Sum.
Solution	2 - Add Two Numbers.
Solution	3 - Longest Substring Without Repeating Characters.
Solution	4 - Median of Two Sorted Arrays.
Solution	5 - Longest Palindromic Substring.
Solution	6 - Zigzag Conversion.
Solution	7 - Reverse Integer.
Solution	8 - String to Integer (atoi).
Solution	9 - Palindrome Number.
Solution	10 - Regular Expression Matching.
Solution	11 - Container With Most Water.
Solution	12 - Integer to Roman.
Solution	13 - Roman to Integer.
Solution	14 - Longest Common Prefix.
Solution	15 - 3Sum.
Solution	16 - 3Sum Closest.
Solution	17 - Letter Combinations of a Phone Number.
Solution	18 - 4Sum.
Solution	19 - Remove Nth Node From End of List.
Solution	20 - Valid Parentheses.
Solution	21 - Merge Two Sorted Lists.
Solution	22 - Generate Parentheses.
Solution	23 - Merge k Sorted Lists.
Solution	24 - Swap Nodes in Pairs.
Solution	25 - Reverse Nodes in k-Group.
Solution	26 - Remove Duplicates from Sorted Array.
Solution	27 - Remove Element.
Solution	28 - Implement strStr().
Solution	29 - Divide Two Integers.
Solution	30 - Substring with Concatenation of All Words.
Solution	31 - Next Permutation.
Solution	32 - Longest Valid Parentheses.
Solution	33 - Search in Rotated Sorted Array.
Solution	34 - Find First and Last Position of Element in Sorted Array.
Solution	35 - Search Insert Position.
Solution	36 - Valid Sudoku.
Solution	37 - Sudoku Solver.
Solution	38 - Count and Say.
Solution	39 - Combination Sum.
Solution	40 - Combination Sum II.
Solution	41 - First Missing Positive.
Solution	42 - Trapping Rain Water.
Solution	43 - Multiply Strings.
Solution	44 - Wildcard Matching.
Solution	45 - Jump Game II.
Solution	46 - Permutations.
Solution	47 - Permutations II.
Solution	48 - Rotate Image.
Solution	49 - Group Anagrams.
Solution	50 - Pow(x, n).
Solution	51 - N-Queens.
Solution	52 - N-Queens II.
Solution	53 - Maximum Subarray.
Solution	54 - Spiral Matrix.
Solution	55 - Jump Game.
Solution	56 - Merge Intervals.
Solution	57 - Insert Interval.
Solution	58 - Length of Last Word.
Solution	59 - Spiral Matrix II.
Solution	60 - Permutation Sequence.
Solution	61 - Rotate List.
Solution	62 - Unique Paths.
Solution	63 - Unique Paths II.
Solution	64 - Minimum Path Sum.
Solution	65 - Valid Number.
Solution	66 - Plus One.
Solution	67 - Add Binary.
Solution	68 - Text Justification.
Solution	69 - Sqrt(x).
Solution	70 - Climbing Stairs.
Solution	71 - Simplify Path.
Solution	72 - Edit Distance.
Solution	73 - Set Matrix Zeroes.
Solution	74 - Search a 2D Matrix.
Solution	75 - Sort Colors.
Solution	76 - Minimum Window Substring.
Solution	77 - Combinations.
Solution	78 - Subsets.
Solution	79 - Word Search.
Solution	80 - Remove Duplicates from Sorted Array II.
Solution	81 - Search in Rotated Sorted Array II.
Solution	82 - Remove Duplicates from Sorted List II.
Solution	83 - Remove Duplicates from Sorted List.
Solution	84 - Largest Rectangle in Histogram.
Solution	85 - Maximal Rectangle.
Solution	86 - Partition List.
Solution	87 - Scramble String.
Solution	88 - Merge Sorted Array.
Solution	89 - Gray Code.
Solution	90 - Subsets II.
Solution	91 - Decode Ways.
Solution	92 - Reverse Linked List II.
Solution	93 - Restore IP Addresses.
Solution	94 - Binary Tree Inorder Traversal.
Solution	95 - Unique Binary Search Trees II.
Solution	96 - Unique Binary Search Trees.
Solution	97 - Interleaving String.
Solution	98 - Validate Binary Search Tree.
Solution	99 - Recover Binary Search Tree.
Solution	100 - Same Tree.
Solution	101 - Symmetric Tree.
Solution	102 - Binary Tree Level Order Traversal.
Solution	103 - Binary Tree Zigzag Level Order Traversal.
Solution	104 - Maximum Depth of Binary Tree.
Solution	105 - Construct Binary Tree from Preorder and Inorder Traversal.
Solution	106 - Construct Binary Tree from Inorder and Postorder Traversal.
Solution	107 - Binary Tree Level Order Traversal II.
Solution	108 - Convert Sorted Array to Binary Search Tree.
Solution	109 - Convert Sorted List to Binary Search Tree.
Solution	110 - Balanced Binary Tree.
Solution	111 - Minimum Depth of Binary Tree.
Solution	112 - Path Sum.
Solution	113 - Path Sum II.
Solution	114 - Flatten Binary Tree to Linked List.
Solution	115 - Distinct Subsequences.
Solution	116 - Populating Next Right Pointers in Each Node.
Solution	117 - Populating Next Right Pointers in Each Node II.
Solution	118 - Pascal’s Triangle.
Solution	119 - Pascal’s Triangle II.
Solution	120 - Triangle.
Solution	121 - Best Time to Buy and Sell Stock.
Solution	122 - Best Time to Buy and Sell Stock II.
Solution	123 - Best Time to Buy and Sell Stock III.
Solution	124 - Binary Tree Maximum Path Sum.
Solution	125 - Valid Palindrome.
Solution	126 - Word Ladder II.
Solution	127 - Word Ladder.
Solution	128 - Longest Consecutive Sequence.
Solution	129 - Sum Root to Leaf Numbers.
Solution	130 - Surrounded Regions.
Solution	131 - Palindrome Partitioning.
Solution	132 - Palindrome Partitioning II.
Solution	133 - Clone Graph.
Solution	134 - Gas Station.
Solution	135 - Candy.
Solution	136 - Single Number.
Solution	137 - Single Number II.
Solution	138 - Copy List with Random Pointer.
Solution	139 - Word Break.
Solution	140 - Word Break II.
Solution	141 - Linked List Cycle.
Solution	142 - Linked List Cycle II.
Solution	143 - Reorder List.
Solution	144 - Binary Tree Preorder Traversal.
Solution	145 - Binary Tree Postorder Traversal.
Solution	147 - Insertion Sort List.
Solution	148 - Sort List.
Solution	149 - Max Points on a Line.
Solution	150 - Evaluate Reverse Polish Notation.
Solution	151 - Reverse Words in a String.
Solution	152 - Maximum Product Subarray.
Solution	153 - Find Minimum in Rotated Sorted Array.
Solution	154 - Find Minimum in Rotated Sorted Array II.
Solution	160 - Intersection of Two Linked Lists.
Solution	162 - Find Peak Element.
Solution	164 - Maximum Gap.
Solution	165 - Compare Version Numbers.
Solution	166 - Fraction to Recurring Decimal.
Solution	167 - Two Sum II - Input Array Is Sorted.
Solution	168 - Excel Sheet Column Title.
Solution	169 - Majority Element.
Solution	171 - Excel Sheet Column Number.
Solution	172 - Factorial Trailing Zeroes.
Solution	174 - Dungeon Game.
Solution	179 - Largest Number.
Solution	187 - Repeated DNA Sequences.
Solution	188 - Best Time to Buy and Sell Stock IV.
Solution	189 - Rotate Array.
Solution	190 - Reverse Bits.
Solution	191 - Number of 1 Bits.
Solution	198 - House Robber.
Solution	199 - Binary Tree Right Side View.
Solution	200 - Number of Islands.
Solution	201 - Bitwise AND of Numbers Range.
Solution	202 - Happy Number.
Solution	203 - Remove Linked List Elements.
Solution	204 - Count Primes.
Solution	205 - Isomorphic Strings.
Solution	206 - Reverse Linked List.
Solution	207 - Course Schedule.
Solution	209 - Minimum Size Subarray Sum.
Solution	210 - Course Schedule II.
Solution	212 - Word Search II.
Solution	213 - House Robber II.
Solution	214 - Shortest Palindrome.
Solution	215 - Kth Largest Element in an Array.
Solution	216 - Combination Sum III.
Solution	217 - Contains Duplicate.
Solution	218 - The Skyline Problem.
Solution	219 - Contains Duplicate II.
Solution	220 - Contains Duplicate III.
Solution	221 - Maximal Square.
Solution	222 - Count Complete Tree Nodes.
Solution	223 - Rectangle Area.
Solution	224 - Basic Calculator.
Solution	226 - Invert Binary Tree.
Solution	227 - Basic Calculator II.
Solution	228 - Summary Ranges.
Solution	229 - Majority Element II.
Solution	230 - Kth Smallest Element in a BST.
Solution	231 - Power of Two.
Solution	233 - Number of Digit One.
Solution	234 - Palindrome Linked List.
Solution	235 - Lowest Common Ancestor of a Binary Search Tree.
Solution	236 - Lowest Common Ancestor of a Binary Tree.
Solution	237 - Delete Node in a Linked List.
Solution	238 - Product of Array Except Self.
Solution	239 - Sliding Window Maximum.
Solution	240 - Search a 2D Matrix II.
Solution	241 - Different Ways to Add Parentheses.
Solution	242 - Valid Anagram.
Solution	257 - Binary Tree Paths.
Solution	258 - Add Digits.
Solution	260 - Single Number III.
Solution	263 - Ugly Number.
Solution	264 - Ugly Number II.
Solution	268 - Missing Number.
Solution	273 - Integer to English Words.
Solution	274 - H-Index.
Solution	275 - H-Index II.
Solution	278 - First Bad Version.
Solution	279 - Perfect Squares.
Solution	282 - Expression Add Operators.
Solution	283 - Move Zeroes.
Solution	287 - Find the Duplicate Number.
Solution	289 - Game of Life.
Solution	290 - Word Pattern.
Solution	292 - Nim Game.
Solution	299 - Bulls and Cows.
Solution	300 - Longest Increasing Subsequence.
Solution	301 - Remove Invalid Parentheses.
Solution	306 - Additive Number.
Solution	309 - Best Time to Buy and Sell Stock with Cooldown.
Solution	310 - Minimum Height Trees.
Solution	312 - Burst Balloons.
Solution	313 - Super Ugly Number.
Solution	315 - Count of Smaller Numbers After Self.
Solution	316 - Remove Duplicate Letters.
Solution	318 - Maximum Product of Word Lengths.
Solution	319 - Bulb Switcher.
Solution	321 - Create Maximum Number.
Solution	322 - Coin Change.
Solution	324 - Wiggle Sort II.
Solution	326 - Power of Three.
Solution	327 - Count of Range Sum.
Solution	328 - Odd Even Linked List.
Solution	329 - Longest Increasing Path in a Matrix.
Solution	330 - Patching Array.
Solution	331 - Verify Preorder Serialization of a Binary Tree.
Solution	332 - Reconstruct Itinerary.
Solution	334 - Increasing Triplet Subsequence.
Solution	335 - Self Crossing.
Solution	336 - Palindrome Pairs.
Solution	337 - House Robber III.
Solution	338 - Counting Bits.
Solution	342 - Power of Four.
Solution	343 - Integer Break.
Solution	344 - Reverse String.
Solution	345 - Reverse Vowels of a String.
Solution	347 - Top K Frequent Elements.
Solution	349 - Intersection of Two Arrays.
Solution	350 - Intersection of Two Arrays II.
Solution	354 - Russian Doll Envelopes.
Solution	357 - Count Numbers with Unique Digits.
Solution	363 - Max Sum of Rectangle No Larger Than K.
Solution	365 - Water and Jug Problem.
Solution	367 - Valid Perfect Square.
Solution	368 - Largest Divisible Subset.
Solution	371 - Sum of Two Integers.
Solution	372 - Super Pow.
Solution	373 - Find K Pairs with Smallest Sums.
Solution	374 - Guess Number Higher or Lower.
Solution	375 - Guess Number Higher or Lower II.
Solution	376 - Wiggle Subsequence.
Solution	377 - Combination Sum IV.
Solution	378 - Kth Smallest Element in a Sorted Matrix.
Solution	382 - Linked List Random Node.
Solution	383 - Ransom Note.
Solution	384 - Shuffle an Array.
Solution	385 - Mini Parser.
Solution	386 - Lexicographical Numbers.
Solution	387 - First Unique Character in a String.
Solution	388 - Longest Absolute File Path.
Solution	389 - Find the Difference.
Solution	390 - Elimination Game.
Solution	391 - Perfect Rectangle.
Solution	392 - Is Subsequence.
Solution	393 - UTF-8 Validation.
Solution	394 - Decode String.
Solution	395 - Longest Substring with At Least K Repeating Characters.
Solution	396 - Rotate Function.
Solution	397 - Integer Replacement.
Solution	398 - Random Pick Index.
Solution	399 - Evaluate Division.
Solution	400 - Nth Digit.
Solution	401 - Binary Watch.
Solution	402 - Remove K Digits.
Solution	403 - Frog Jump.
Solution	404 - Sum of Left Leaves.
Solution	405 - Convert a Number to Hexadecimal.
Solution	406 - Queue Reconstruction by Height.
Solution	407 - Trapping Rain Water II.
Solution	409 - Longest Palindrome.
Solution	410 - Split Array Largest Sum.
Solution	412 - Fizz Buzz.
Solution	413 - Arithmetic Slices.
Solution	414 - Third Maximum Number.
Solution	415 - Add Strings.
Solution	416 - Partition Equal Subset Sum.
Solution	417 - Pacific Atlantic Water Flow.
Solution	419 - Battleships in a Board.
Solution	420 - Strong Password Checker.
Solution	421 - Maximum XOR of Two Numbers in an Array.
Solution	423 - Reconstruct Original Digits from English.
Solution	424 - Longest Repeating Character Replacement.
Solution	427 - Construct Quad Tree.
Solution	429 - N-ary Tree Level Order Traversal.
Solution	430 - Flatten a Multilevel Doubly Linked List.
Solution	433 - Minimum Genetic Mutation.
Solution	434 - Number of Segments in a String.
Solution	435 - Non-overlapping Intervals.
Solution	436 - Find Right Interval.
Solution	437 - Path Sum III.
Solution	438 - Find All Anagrams in a String.
Solution	440 - K-th Smallest in Lexicographical Order.
Solution	441 - Arranging Coins.
Solution	442 - Find All Duplicates in an Array.
Solution	443 - String Compression.
Solution	445 - Add Two Numbers II.
Solution	446 - Arithmetic Slices II - Subsequence.
Solution	447 - Number of Boomerangs.
Solution	448 - Find All Numbers Disappeared in an Array.
Solution	450 - Delete Node in a BST.
Solution	451 - Sort Characters By Frequency.
Solution	452 - Minimum Number of Arrows to Burst Balloons.
Solution	453 - Minimum Moves to Equal Array Elements.
Solution	454 - 4Sum II.
Solution	455 - Assign Cookies.
Solution	456 - 132 Pattern.
Solution	457 - Circular Array Loop.
Solution	458 - Poor Pigs.
Solution	459 - Repeated Substring Pattern.
Solution	461 - Hamming Distance.
Solution	462 - Minimum Moves to Equal Array Elements II.
Solution	463 - Island Perimeter.
Solution	464 - Can I Win.
Solution	466 - Count The Repetitions.
Solution	467 - Unique Substrings in Wraparound String.
Solution	468 - Validate IP Address.
Solution	470 - Implement Rand10() Using Rand7().
Solution	472 - Concatenated Words.
Solution	473 - Matchsticks to Square.
Solution	474 - Ones and Zeroes.
Solution	475 - Heaters.
Solution	476 - Number Complement.
Solution	477 - Total Hamming Distance.
Solution	478 - Generate Random Point in a Circle.
Solution	479 - Largest Palindrome Product.
Solution	480 - Sliding Window Median.
Solution	481 - Magical String.
Solution	482 - License Key Formatting.
Solution	483 - Smallest Good Base.
Solution	485 - Max Consecutive Ones.
Solution	486 - Predict the Winner.
Solution	488 - Zuma Game.
Solution	491 - Increasing Subsequences.
Solution	492 - Construct the Rectangle.
Solution	493 - Reverse Pairs.
Solution	494 - Target Sum.
Solution	495 - Teemo Attacking.
Solution	496 - Next Greater Element I.
Solution	497 - Random Point in Non-overlapping Rectangles.
Solution	498 - Diagonal Traverse.
Solution	500 - Keyboard Row.
Solution	501 - Find Mode in Binary Search Tree.
Solution	502 - IPO.
Solution	503 - Next Greater Element II.
Solution	504 - Base 7.
Solution	506 - Relative Ranks.
Solution	507 - Perfect Number.
Solution	508 - Most Frequent Subtree Sum.
Solution	509 - Fibonacci Number.
Solution	513 - Find Bottom Left Tree Value.
Solution	514 - Freedom Trail.
Solution	515 - Find Largest Value in Each Tree Row.
Solution	516 - Longest Palindromic Subsequence.
Solution	517 - Super Washing Machines.
Solution	518 - Coin Change 2.
Solution	519 - Random Flip Matrix.
Solution	520 - Detect Capital.
Solution	521 - Longest Uncommon Subsequence I.
Solution	522 - Longest Uncommon Subsequence II.
Solution	523 - Continuous Subarray Sum.
Solution	524 - Longest Word in Dictionary through Deleting.
Solution	525 - Contiguous Array.
Solution	526 - Beautiful Arrangement.
Solution	528 - Random Pick with Weight.
Solution	529 - Minesweeper.
Solution	530 - Minimum Absolute Difference in BST.
Solution	532 - K-diff Pairs in an Array.
Solution	537 - Complex Number Multiplication.
Solution	538 - Convert BST to Greater Tree.
Solution	539 - Minimum Time Difference.
Solution	540 - Single Element in a Sorted Array.
Solution	541 - Reverse String II.
Solution	542 - 01 Matrix.
Solution	543 - Diameter of Binary Tree.
Solution	546 - Remove Boxes.
Solution	547 - Number of Provinces.
Solution	551 - Student Attendance Record I.
Solution	552 - Student Attendance Record II.
Solution	553 - Optimal Division.
Solution	554 - Brick Wall.
Solution	556 - Next Greater Element III.
Solution	557 - Reverse Words in a String III.
Solution	558 - Logical OR of Two Binary Grids Represented as Quad-Trees.
Solution	559 - Maximum Depth of N-ary Tree.
Solution	560 - Subarray Sum Equals K.
Solution	561 - Array Partition I.
Solution	563 - Binary Tree Tilt.
Solution	564 - Find the Closest Palindrome.
Solution	565 - Array Nesting.
Solution	566 - Reshape the Matrix.
Solution	567 - Permutation in String.
Solution	572 - Subtree of Another Tree.
Solution	575 - Distribute Candies.
Solution	576 - Out of Boundary Paths.
Solution	581 - Shortest Unsorted Continuous Subarray.
Solution	583 - Delete Operation for Two Strings.
Solution	587 - Erect the Fence.
Solution	589 - N-ary Tree Preorder Traversal.
Solution	590 - N-ary Tree Postorder Traversal.
Solution	591 - Tag Validator.
Solution	592 - Fraction Addition and Subtraction.
Solution	593 - Valid Square.
Solution	594 - Longest Harmonious Subsequence.
Solution	598 - Range Addition II.
Solution	599 - Minimum Index Sum of Two Lists.
Solution	600 - Non-negative Integers without Consecutive Ones.
Solution	605 - Can Place Flowers.
Solution	606 - Construct String from Binary Tree.
Solution	609 - Find Duplicate File in System.
Solution	611 - Valid Triangle Number.
Solution	617 - Merge Two Binary Trees.
Solution	621 - Task Scheduler.
Solution	623 - Add One Row to Tree.
Solution	628 - Maximum Product of Three Numbers.
Solution	629 - K Inverse Pairs Array.
Solution	630 - Course Schedule III.
Solution
Solution	633 - Sum of Square Numbers.
Solution	636 - Exclusive Time of Functions.
Solution	637 - Average of Levels in Binary Tree.
Solution	638 - Shopping Offers.
Solution	639 - Decode Ways II.
Solution	640 - Solve the Equation.
Solution	643 - Maximum Average Subarray I.
Solution	645 - Set Mismatch.
Solution	646 - Maximum Length of Pair Chain.
Solution	647 - Palindromic Substrings.
Solution	648 - Replace Words.
Solution	649 - Dota2 Senate.
Solution	650 - 2 Keys Keyboard.
Solution	652 - Find Duplicate Subtrees.
Solution	653 - Two Sum IV - Input is a BST.
Solution	654 - Maximum Binary Tree.
Solution	655 - Print Binary Tree.
Solution	657 - Robot Return to Origin.
Solution	658 - Find K Closest Elements.
Solution	659 - Split Array into Consecutive Subsequences.
Solution	661 - Image Smoother.
Solution	662 - Maximum Width of Binary Tree.
Solution	664 - Strange Printer.
Solution	665 - Non-decreasing Array.
Solution	667 - Beautiful Arrangement II.
Solution	668 - Kth Smallest Number in Multiplication Table.
Solution	669 - Trim a Binary Search Tree.
Solution	670 - Maximum Swap.
Solution	671 - Second Minimum Node In a Binary Tree.
Solution	672 - Bulb Switcher II.
Solution	673 - Number of Longest Increasing Subsequence.
Solution	674 - Longest Continuous Increasing Subsequence.
Solution	675 - Cut Off Trees for Golf Event.
Solution	678 - Valid Parenthesis String.
Solution	679 - 24 Game.
Solution	680 - Valid Palindrome II.
Solution	682 - Baseball Game.
Solution	684 - Redundant Connection.
Solution	685 - Redundant Connection II.
Solution	686 - Repeated String Match.
Solution	687 - Longest Univalue Path.
Solution	688 - Knight Probability in Chessboard.
Solution	689 - Maximum Sum of 3 Non-Overlapping Subarrays.
Solution	690 - Employee Importance.
Solution	691 - Stickers to Spell Word.
Solution	692 - Top K Frequent Words.
Solution	693 - Binary Number with Alternating Bits.
Solution	695 - Max Area of Island.
Solution	696 - Count Binary Substrings.
Solution	697 - Degree of an Array.
Solution	698 - Partition to K Equal Sum Subsets.
Solution	699 - Falling Squares.
Solution	700 - Search in a Binary Search Tree.
Solution	701 - Insert into a Binary Search Tree.
Solution	704 - Binary Search.
Solution	709 - To Lower Case.
Solution	710 - Random Pick with Blacklist.
Solution	712 - Minimum ASCII Delete Sum for Two Strings.
Solution	713 - Subarray Product Less Than K.
Solution	714 - Best Time to Buy and Sell Stock with Transaction Fee.
Solution	717 - 1-bit and 2-bit Characters.
Solution	718 - Maximum Length of Repeated Subarray.
Solution	719 - Find K-th Smallest Pair Distance.
Solution	720 - Longest Word in Dictionary.
Solution	721 - Accounts Merge.
Solution	722 - Remove Comments.
Solution	724 - Find Pivot Index.
Solution	725 - Split Linked List in Parts.
Solution	726 - Number of Atoms.
Solution	728 - Self Dividing Numbers.
Solution	730 - Count Different Palindromic Subsequences.
Solution	733 - Flood Fill.
Solution	735 - Asteroid Collision.
Solution	736 - Parse Lisp Expression.
Solution	738 - Monotone Increasing Digits.
Solution	739 - Daily Temperatures.
Solution	740 - Delete and Earn.
Solution	741 - Cherry Pickup.
Solution	743 - Network Delay Time.
Solution	744 - Find Smallest Letter Greater Than Target.
Solution	746 - Min Cost Climbing Stairs.
Solution	747 - Largest Number At Least Twice of Others.
Solution	748 - Shortest Completing Word.
Solution	749 - Contain Virus.
Solution	752 - Open the Lock.
Solution	753 - Cracking the Safe.
Solution	754 - Reach a Number.
Solution	756 - Pyramid Transition Matrix.
Solution	757 - Set Intersection Size At Least Two.
Solution	761 - Special Binary String.
Solution	762 - Prime Number of Set Bits in Binary Representation.
Solution	763 - Partition Labels.
Solution	764 - Largest Plus Sign.
Solution	765 - Couples Holding Hands.
Solution	766 - Toeplitz Matrix.
Solution	767 - Reorganize String.
Solution	768 - Max Chunks To Make Sorted II.
Solution	769 - Max Chunks To Make Sorted.
Solution	770 - Basic Calculator IV.
Solution	771 - Jewels and Stones.
Solution	773 - Sliding Puzzle.
Solution	775 - Global and Local Inversions.
Solution	777 - Swap Adjacent in LR String.
Solution	778 - Swim in Rising Water.
Solution	779 - K-th Symbol in Grammar.
Solution	780 - Reaching Points.
Solution	781 - Rabbits in Forest.
Solution	782 - Transform to Chessboard.
Solution	783 - Minimum Distance Between BST Nodes.
Solution	784 - Letter Case Permutation.
Solution	785 - Is Graph Bipartite?
Solution	786 - K-th Smallest Prime Fraction.
Solution	787 - Cheapest Flights Within K Stops.
Solution	788 - Rotated Digits.
Solution	789 - Escape The Ghosts.
Solution	790 - Domino and Tromino Tiling.
Solution	791 - Custom Sort String.
Solution	792 - Number of Matching Subsequences.
Solution	793 - Preimage Size of Factorial Zeroes Function.
Solution	794 - Valid Tic-Tac-Toe State.
Solution	795 - Number of Subarrays with Bounded Maximum.
Solution	796 - Rotate String.
Solution	797 - All Paths From Source to Target.
Solution	798 - Smallest Rotation with Highest Score.
Solution	799 - Champagne Tower.
Solution	801 - Minimum Swaps To Make Sequences Increasing.
Solution	802 - Find Eventual Safe States.
Solution	803 - Bricks Falling When Hit.
Solution	804 - Unique Morse Code Words.
Solution	805 - Split Array With Same Average.
Solution	806 - Number of Lines To Write String.
Solution	807 - Max Increase to Keep City Skyline.
Solution	808 - Soup Servings.
Solution	809 - Expressive Words.
Solution	810 - Chalkboard XOR Game.
Solution	811 - Subdomain Visit Count.
Solution	812 - Largest Triangle Area.
Solution	813 - Largest Sum of Averages.
Solution	814 - Binary Tree Pruning.
Solution	815 - Bus Routes.
Solution	816 - Ambiguous Coordinates.
Solution	817 - Linked List Components.
Solution	818 - Race Car.
Solution	819 - Most Common Word.
Solution	820 - Short Encoding of Words.
Solution	821 - Shortest Distance to a Character.
Solution	822 - Card Flipping Game.
Solution	823 - Binary Trees With Factors.
Solution	824 - Goat Latin.
Solution	825 - Friends Of Appropriate Ages.
Solution	826 - Most Profit Assigning Work.
Solution	827 - Making A Large Island.
Solution	828 - Count Unique Characters of All Substrings of a Given String.
Solution	829 - Consecutive Numbers Sum.
Solution	830 - Positions of Large Groups.
Solution	831 - Masking Personal Information.
Solution	832 - Flipping an Image.
Solution	833 - Find And Replace in String.
Solution	834 - Sum of Distances in Tree.
Solution	835 - Image Overlap.
Solution	836 - Rectangle Overlap.
Solution	837 - New 21 Game.
Solution	838 - Push Dominoes.
Solution	839 - Similar String Groups.
Solution	840 - Magic Squares In Grid.
Solution	841 - Keys and Rooms.
Solution	842 - Split Array into Fibonacci Sequence.
Solution	843 - Guess the Word.
Solution	844 - Backspace String Compare.
Solution	845 - Longest Mountain in Array.
Solution	846 - Hand of Straights.
Solution	847 - Shortest Path Visiting All Nodes.
Solution	848 - Shifting Letters.
Solution	849 - Maximize Distance to Closest Person.
Solution	850 - Rectangle Area II.
Solution	851 - Loud and Rich.
Solution	852 - Peak Index in a Mountain Array.
Solution	853 - Car Fleet.
Solution	854 - K-Similar Strings.
Solution	856 - Score of Parentheses.
Solution	857 - Minimum Cost to Hire K Workers.
Solution	858 - Mirror Reflection.
Solution	859 - Buddy Strings.
Solution	860 - Lemonade Change.
Solution	861 - Score After Flipping Matrix.
Solution	862 - Shortest Subarray with Sum at Least K.
Solution	863 - All Nodes Distance K in Binary Tree.
Solution	864 - Shortest Path to Get All Keys.
Solution	865 - Smallest Subtree with all the Deepest Nodes.
Solution	866 - Prime Palindrome.
Solution	867 - Transpose Matrix.
Solution	868 - Binary Gap.
Solution	869 - Reordered Power of 2.
Solution	870 - Advantage Shuffle.
Solution	871 - Minimum Number of Refueling Stops.
Solution	872 - Leaf-Similar Trees.
Solution	873 - Length of Longest Fibonacci Subsequence.
Solution	874 - Walking Robot Simulation.
Solution	875 - Koko Eating Bananas.
Solution	876 - Middle of the Linked List.
Solution	877 - Stone Game.
Solution	878 - Nth Magical Number.
Solution	879 - Profitable Schemes.
Solution	880 - Decoded String at Index.
Solution	881 - Boats to Save People.
Solution	882 - Reachable Nodes In Subdivided Graph.
Solution	883 - Projection Area of 3D Shapes.
Solution	884 - Uncommon Words from Two Sentences.
Solution	885 - Spiral Matrix III.
Solution	886 - Possible Bipartition.
Solution	887 - Super Egg Drop.
Solution	888 - Fair Candy Swap.
Solution	889 - Construct Binary Tree from Preorder and Postorder Traversal.
Solution	890 - Find and Replace Pattern.
Solution	891 - Sum of Subsequence Widths.
Solution	892 - Surface Area of 3D Shapes.
Solution	893 - Groups of Special-Equivalent Strings.
Solution	896 - Monotonic Array.
Solution	897 - Increasing Order Search Tree.
Solution	898 - Bitwise ORs of Subarrays.
Solution	899 - Orderly Queue.
Solution	902 - Numbers At Most N Given Digit Set.
Solution	903 - Valid Permutations for DI Sequence.
Solution	904 - Fruit Into Baskets.
Solution	905 - Sort Array By Parity.
Solution	906 - Super Palindromes.
Solution	907 - Sum of Subarray Minimums.
Solution	908 - Smallest Range I.
Solution	909 - Snakes and Ladders.
Solution	910 - Smallest Range II.
Solution	912 - Sort an Array.
Solution	913 - Cat and Mouse.
Solution	914 - X of a Kind in a Deck of Cards.
Solution	915 - Partition Array into Disjoint Intervals.
Solution	916 - Word Subsets.
Solution	917 - Reverse Only Letters.
Solution	918 - Maximum Sum Circular Subarray.
Solution	920 - Number of Music Playlists.
Solution	921 - Minimum Add to Make Parentheses Valid.
Solution	922 - Sort Array By Parity II.
Solution	923 - 3Sum With Multiplicity.
Solution	924 - Minimize Malware Spread.
Solution	925 - Long Pressed Name.
Solution	926 - Flip String to Monotone Increasing.
Solution	927 - Three Equal Parts.
Solution	928 - Minimize Malware Spread II.
Solution	929 - Unique Email Addresses.
Solution	930 - Binary Subarrays With Sum.
Solution	931 - Minimum Falling Path Sum.
Solution	932 - Beautiful Array.
Solution	934 - Shortest Bridge.
Solution	935 - Knight Dialer.
Solution	936 - Stamping The Sequence.
Solution	937 - Reorder Data in Log Files.
Solution	938 - Range Sum of BST.
Solution	939 - Minimum Area Rectangle.
Solution	940 - Distinct Subsequences II.
Solution	941 - Valid Mountain Array.
Solution	942 - DI String Match.
Solution	943 - Find the Shortest Superstring.
Solution	944 - Delete Columns to Make Sorted.
Solution	945 - Minimum Increment to Make Array Unique.
Solution	946 - Validate Stack Sequences.
Solution	947 - Most Stones Removed with Same Row or Column.
Solution	948 - Bag of Tokens.
Solution	949 - Largest Time for Given Digits.
Solution	950 - Reveal Cards In Increasing Order.
Solution	951 - Flip Equivalent Binary Trees.
Solution	952 - Largest Component Size by Common Factor.
Solution	953 - Verifying an Alien Dictionary.
Solution	954 - Array of Doubled Pairs.
Solution	955 - Delete Columns to Make Sorted II.
Solution	956 - Tallest Billboard.
Solution	957 - Prison Cells After N Days.
Solution	958 - Check Completeness of a Binary Tree.
Solution	959 - Regions Cut By Slashes.
Solution	960 - Delete Columns to Make Sorted III.
Solution	961 - N-Repeated Element in Size 2N Array.
Solution	962 - Maximum Width Ramp.
Solution	963 - Minimum Area Rectangle II.
Solution	964 - Least Operators to Express Number.
Solution	965 - Univalued Binary Tree.
Solution	966 - Vowel Spellchecker.
Solution	967 - Numbers With Same Consecutive Differences.
Solution	968 - Binary Tree Cameras.
Solution	969 - Pancake Sorting.
Solution	970 - Powerful Integers.
Solution	971 - Flip Binary Tree To Match Preorder Traversal.
Solution	972 - Equal Rational Numbers.
Solution	973 - K Closest Points to Origin.
Solution	974 - Subarray Sums Divisible by K.
Solution	975 - Odd Even Jump.
Solution	976 - Largest Perimeter Triangle.
Solution	977 - Squares of a Sorted Array.
Solution	978 - Longest Turbulent Subarray.
Solution	979 - Distribute Coins in Binary Tree.
Solution	980 - Unique Paths III.
Solution	982 - Triples with Bitwise AND Equal To Zero.
Solution	983 - Minimum Cost For Tickets.
Solution	984 - String Without AAA or BBB.
Solution	985 - Sum of Even Numbers After Queries.
Solution	986 - Interval List Intersections.
Solution	987 - Vertical Order Traversal of a Binary Tree.
Solution	988 - Smallest String Starting From Leaf.
Solution	989 - Add to Array-Form of Integer.
Solution	990 - Satisfiability of Equality Equations.
Solution	991 - Broken Calculator.
Solution	992 - Subarrays with K Different Integers.
Solution	993 - Cousins in Binary Tree.
Solution	994 - Rotting Oranges.
Solution	995 - Minimum Number of K Consecutive Bit Flips.
Solution	996 - Number of Squareful Arrays.
Solution	997 - Find the Town Judge.
Solution	998 - Maximum Binary Tree II.
Solution	999 - Available Captures for Rook.
Solution	1000 - Minimum Cost to Merge Stones.
Solution	1001 - Grid Illumination.
Solution	1002 - Find Common Characters.
Solution	1003 - Check If Word Is Valid After Substitutions.
Solution	1004 - Max Consecutive Ones III.
Solution	1005 - Maximize Sum Of Array After K Negations.
Solution	1006 - Clumsy Factorial.
Solution	1007 - Minimum Domino Rotations For Equal Row.
Solution	1008 - Construct Binary Search Tree from Preorder Traversal.
Solution	1009 - Complement of Base 10 Integer.
Solution	1010 - Pairs of Songs With Total Durations Divisible by 60.
Solution	1011 - Capacity To Ship Packages Within D Days.
Solution	1012 - Numbers With Repeated Digits.
Solution	1013 - Partition Array Into Three Parts With Equal Sum.
Solution	1014 - Best Sightseeing Pair.
Solution	1015 - Smallest Integer Divisible by K.
Solution	1016 - Binary String With Substrings Representing 1 To N.
Solution	1017 - Convert to Base -2.
Solution	1018 - Binary Prefix Divisible By 5.
Solution	1019 - Next Greater Node In Linked List.
Solution	1020 - Number of Enclaves.
Solution	1021 - Remove Outermost Parentheses.
Solution	1022 - Sum of Root To Leaf Binary Numbers.
Solution	1023 - Camelcase Matching.
Solution	1024 - Video Stitching.
Solution	1025 - Divisor Game.
Solution	1026 - Maximum Difference Between Node and Ancestor.
Solution	1027 - Longest Arithmetic Subsequence.
Solution	1028 - Recover a Tree From Preorder Traversal.
Solution	1029 - Two City Scheduling.
Solution	1030 - Matrix Cells in Distance Order.
Solution	1031 - Maximum Sum of Two Non-Overlapping Subarrays.
Solution	1033 - Moving Stones Until Consecutive.
Solution	1034 - Coloring A Border.
Solution	1035 - Uncrossed Lines.
Solution	1036 - Escape a Large Maze.
Solution	1037 - Valid Boomerang.
Solution	1038 - Binary Search Tree to Greater Sum Tree.
Solution	1039 - Minimum Score Triangulation of Polygon.
Solution	1040 - Moving Stones Until Consecutive II.
Solution	1041 - Robot Bounded In Circle.
Solution	1042 - Flower Planting With No Adjacent.
Solution	1043 - Partition Array for Maximum Sum.
Solution	1044 - Longest Duplicate Substring.
Solution	1046 - Last Stone Weight.
Solution	1047 - Remove All Adjacent Duplicates In String.
Solution	1048 - Longest String Chain.
Solution	1049 - Last Stone Weight II.
Solution	1051 - Height Checker.
Solution	1052 - Grumpy Bookstore Owner.
Solution	1053 - Previous Permutation With One Swap.
Solution	1054 - Distant Barcodes.
Solution	1071 - Greatest Common Divisor of Strings.
Solution	1072 - Flip Columns For Maximum Number of Equal Rows.
Solution	1073 - Adding Two Negabinary Numbers.
Solution	1074 - Number of Submatrices That Sum to Target.
Solution	1078 - Occurrences After Bigram.
Solution	1079 - Letter Tile Possibilities.
Solution	1080 - Insufficient Nodes in Root to Leaf Paths.
Solution	1081 - Smallest Subsequence of Distinct Characters.
Solution	1089 - Duplicate Zeros.
Solution	1090 - Largest Values From Labels.
Solution	1091 - Shortest Path in Binary Matrix.
Solution	1092 - Shortest Common Supersequence.
Solution	1093 - Statistics from a Large Sample.
Solution	1094 - Car Pooling.
Solution	1095 - Find in Mountain Array.
Solution	1096 - Brace Expansion II.
Solution	1103 - Distribute Candies to People.
Solution	1104 - Path In Zigzag Labelled Binary Tree.
Solution	1105 - Filling Bookcase Shelves.
Solution	1106 - Parsing A Boolean Expression.
Solution	1108 - Defanging an IP Address.
Solution	1109 - Corporate Flight Bookings.
Solution	1110 - Delete Nodes And Return Forest.
Solution	1111 - Maximum Nesting Depth of Two Valid Parentheses Strings.
Solution	1122 - Relative Sort Array.
Solution	1123 - Lowest Common Ancestor of Deepest Leaves.
Solution	1124 - Longest Well-Performing Interval.
Solution	1125 - Smallest Sufficient Team.
Solution	1128 - Number of Equivalent Domino Pairs.
Solution	1129 - Shortest Path with Alternating Colors.
Solution	1130 - Minimum Cost Tree From Leaf Values.
Solution	1131 - Maximum of Absolute Value Expression.
Solution	1137 - N-th Tribonacci Number.
Solution	1138 - Alphabet Board Path.
Solution	1139 - Largest 1-Bordered Square.
Solution	1140 - Stone Game II.
Solution	1143 - Longest Common Subsequence.
Solution	1144 - Decrease Elements To Make Array Zigzag.
Solution	1145 - Binary Tree Coloring Game.
Solution	1147 - Longest Chunked Palindrome Decomposition.
Solution	1154 - Day of the Year.
Solution	1155 - Number of Dice Rolls With Target Sum.
Solution	1156 - Swap For Longest Repeated Character Substring.
Solution	1160 - Find Words That Can Be Formed by Characters.
Solution	1161 - Maximum Level Sum of a Binary Tree.
Solution	1162 - As Far from Land as Possible.
Solution	1163 - Last Substring in Lexicographical Order.
Solution	1169 - Invalid Transactions.
Solution	1170 - Compare Strings by Frequency of the Smallest Character.
Solution	1171 - Remove Zero Sum Consecutive Nodes from Linked List.
Solution	1175 - Prime Arrangements.
Solution	1177 - Can Make Palindrome from Substring.
Solution	1178 - Number of Valid Words for Each Puzzle.
Solution	1184 - Distance Between Bus Stops.
Solution	1185 - Day of the Week.
Solution	1186 - Maximum Subarray Sum with One Deletion.
Solution	1187 - Make Array Strictly Increasing.
Solution	1189 - Maximum Number of Balloons.
Solution	1190 - Reverse Substrings Between Each Pair of Parentheses.
Solution	1191 - K-Concatenation Maximum Sum.
Solution	1192 - Critical Connections in a Network.
Solution	1200 - Minimum Absolute Difference.
Solution	1201 - Ugly Number III.
Solution	1202 - Smallest String With Swaps.
Solution	1203 - Sort Items by Groups Respecting Dependencies.
Solution	1207 - Unique Number of Occurrences.
Solution	1208 - Get Equal Substrings Within Budget.
Solution	1209 - Remove All Adjacent Duplicates in String II.
Solution	1210 - Minimum Moves to Reach Target with Rotations.
Solution	1217 - Minimum Cost to Move Chips to The Same Position.
Solution	1218 - Longest Arithmetic Subsequence of Given Difference.
Solution	1219 - Path with Maximum Gold.
Solution	1220 - Count Vowels Permutation.
Solution	1221 - Split a String in Balanced Strings.
Solution	1222 - Queens That Can Attack the King.
Solution	1223 - Dice Roll Simulation.
Solution	1224 - Maximum Equal Frequency.
Solution	1227 - Airplane Seat Assignment Probability.
Solution	1232 - Check If It Is a Straight Line.
Solution	1233 - Remove Sub-Folders from the Filesystem.
Solution	1234 - Replace the Substring for Balanced String.
Solution	1235 - Maximum Profit in Job Scheduling.
Solution	1237 - Find Positive Integer Solution for a Given Equation.
Solution	1238 - Circular Permutation in Binary Representation.
Solution	1239 - Maximum Length of a Concatenated String with Unique Characters.
Solution	1240 - Tiling a Rectangle with the Fewest Squares.
Solution	1247 - Minimum Swaps to Make Strings Equal.
Solution	1248 - Count Number of Nice Subarrays.
Solution	1249 - Minimum Remove to Make Valid Parentheses.
Solution	1250 - Check If It Is a Good Array.
Solution	1252 - Cells with Odd Values in a Matrix.
Solution	1253 - Reconstruct a 2-Row Binary Matrix.
Solution	1254 - Number of Closed Islands.
Solution	1255 - Maximum Score Words Formed by Letters.
Solution	1260 - Shift 2D Grid.
Solution	1262 - Greatest Sum Divisible by Three.
Solution	1263 - Minimum Moves to Move a Box to Their Target Location.
Solution	1266 - Minimum Time Visiting All Points.
Solution	1267 - Count Servers that Communicate.
Solution	1268 - Search Suggestions System.
Solution	1269 - Number of Ways to Stay in the Same Place After Some Steps.
Solution	1275 - Find Winner on a Tic Tac Toe Game.
Solution	1276 - Number of Burgers with No Waste of Ingredients.
Solution	1277 - Count Square Submatrices with All Ones.
Solution	1278 - Palindrome Partitioning III.
Solution	1281 - Subtract the Product and Sum of Digits of an Integer.
Solution	1282 - Group the People Given the Group Size They Belong To.
Solution	1283 - Find the Smallest Divisor Given a Threshold.
Solution	1284 - Minimum Number of Flips to Convert Binary Matrix to Zero Matrix.
Solution	1287 - Element Appearing More Than 25% In Sorted Array.
Solution	1288 - Remove Covered Intervals.
Solution	1289 - Minimum Falling Path Sum II.
Solution	1290 - Convert Binary Number in a Linked List to Integer.
Solution	1291 - Sequential Digits.
Solution	1292 - Maximum Side Length of a Square with Sum Less than or Equal to Threshold.
Solution	1293 - Shortest Path in a Grid with Obstacles Elimination.
Solution	1295 - Find Numbers with Even Number of Digits.
Solution	1296 - Divide Array in Sets of K Consecutive Numbers.
Solution	1297 - Maximum Number of Occurrences of a Substring.
Solution	1298 - Maximum Candies You Can Get from Boxes.
Solution	1299 - Replace Elements with Greatest Element on Right Side.
Solution	1300 - Sum of Mutated Array Closest to Target.
Solution	1301 - Number of Paths with Max Score.
Solution	1302 - Deepest Leaves Sum.
Solution	1304 - Find N Unique Integers Sum up to Zero.
Solution	1305 - All Elements in Two Binary Search Trees.
Solution	1306 - Jump Game III.
Solution	1307 - Verbal Arithmetic Puzzle.
Solution	1309 - Decrypt String from Alphabet to Integer Mapping.
Solution	1310 - XOR Queries of a Subarray.
Solution	1311 - Get Watched Videos by Your Friends.
Solution	1312 - Minimum Insertion Steps to Make a String Palindrome.
Solution	1313 - Decompress Run-Length Encoded List.
Solution	1314 - Matrix Block Sum.
Solution	1315 - Sum of Nodes with Even-Valued Grandparent.
Solution	1316 - Distinct Echo Substrings.
Solution	1317 - Convert Integer to the Sum of Two No-Zero Integers.
Solution	1318 - Minimum Flips to Make a OR b Equal to c.
Solution	1319 - Number of Operations to Make Network Connected.
Solution	1320 - Minimum Distance to Type a Word Using Two Fingers.
Solution	1323 - Maximum 69 Number.
Solution	1324 - Print Words Vertically.
Solution	1325 - Delete Leaves With a Given Value.
Solution	1326 - Minimum Number of Taps to Open to Water a Garden.
Solution	1328 - Break a Palindrome.
Solution	1329 - Sort the Matrix Diagonally.
Solution	1330 - Reverse Subarray To Maximize Array Value.
Solution	1331 - Rank Transform of an Array.
Solution	1332 - Remove Palindromic Subsequences.
Solution	1333 - Filter Restaurants by Vegan-Friendly, Price and Distance.
Solution	1334 - Find the City With the Smallest Number of Neighbors at a Threshold Distance.
Solution	1335 - Minimum Difficulty of a Job Schedule.
Solution	1337 - The K Weakest Rows in a Matrix.
Solution	1338 - Reduce Array Size to The Half.
Solution	1339 - Maximum Product of Splitted Binary Tree.
Solution	1340 - Jump Game V.
Solution	1342 - Number of Steps to Reduce a Number to Zero.
Solution	1343 - Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold.
Solution	1344 - Angle Between Hands of a Clock.
Solution	1345 - Jump Game IV.
Solution	1346 - Check If N and Its Double Exist.
Solution	1347 - Minimum Number of Steps to Make Two Strings Anagram.
Solution	1349 - Maximum Students Taking Exam.
Solution	1351 - Count Negative Numbers in a Sorted Matrix.
Solution	1353 - Maximum Number of Events That Can Be Attended.
Solution	1354 - Construct Target Array With Multiple Sums.
Solution	1356 - Sort Integers by The Number of 1 Bits.
Solution	1358 - Number of Substrings Containing All Three Characters.
Solution	1359 - Count All Valid Pickup and Delivery Options.
Solution	1360 - Number of Days Between Two Dates.
Solution	1361 - Validate Binary Tree Nodes.
Solution	1362 - Closest Divisors.
Solution	1363 - Largest Multiple of Three.
Solution	1365 - How Many Numbers Are Smaller Than the Current Number.
Solution	1366 - Rank Teams by Votes.
Solution	1367 - Linked List in Binary Tree.
Solution	1368 - Minimum Cost to Make at Least One Valid Path in a Grid.
Solution	1370 - Increasing Decreasing String.
Solution	1371 - Find the Longest Substring Containing Vowels in Even Counts.
Solution	1372 - Longest ZigZag Path in a Binary Tree.
Solution	1373 - Maximum Sum BST in Binary Tree.
Solution	1374 - Generate a String With Characters That Have Odd Counts.
Solution	1375 - Number of Times Binary String Is Prefix-Aligned.
Solution	1376 - Time Needed to Inform All Employees.
Solution	1377 - Frog Position After T Seconds.
Solution	1379 - Find a Corresponding Node of a Binary Tree in a Clone of That Tree.
Solution	1380 - Lucky Numbers in a Matrix.
Solution	1382 - Balance a Binary Search Tree.
Solution	1383 - Maximum Performance of a Team.
Solution	1385 - Find the Distance Value Between Two Arrays.
Solution	1386 - Cinema Seat Allocation.
Solution	1387 - Sort Integers by The Power Value.
Solution	1388 - Pizza With 3n Slices.
Solution	1389 - Create Target Array in the Given Order.
Solution	1390 - Four Divisors.
Solution	1391 - Check if There is a Valid Path in a Grid.
Solution	1392 - Longest Happy Prefix.
Solution	1394 - Find Lucky Integer in an Array.
Solution	1395 - Count Number of Teams.
Solution	1397 - Find All Good Strings.
Solution	1399 - Count Largest Group.
Solution	1400 - Construct K Palindrome Strings.
Solution	1401 - Circle and Rectangle Overlapping.
Solution	1402 - Reducing Dishes.
Solution	1403 - Minimum Subsequence in Non-Increasing Order.
Solution	1404 - Number of Steps to Reduce a Number in Binary Representation to One.
Solution	1405 - Longest Happy String.
Solution	1406 - Stone Game III.
Solution	1408 - String Matching in an Array.
Solution	1409 - Queries on a Permutation With Key.
Solution	1410 - HTML Entity Parser.
Solution	1411 - Number of Ways to Paint N × 3 Grid.
Solution	1413 - Minimum Value to Get Positive Step by Step Sum.
Solution	1414 - Find the Minimum Number of Fibonacci Numbers Whose Sum Is K.
Solution	1415 - The k-th Lexicographical String of All Happy Strings of Length n.
Solution	1416 - Restore The Array.
Solution	1417 - Reformat The String.
Solution	1418 - Display Table of Food Orders in a Restaurant.
Solution	1419 - Minimum Number of Frogs Croaking.
Solution	1420 - Build Array Where You Can Find The Maximum Exactly K Comparisons.
Solution	1422 - Maximum Score After Splitting a String.
Solution	1423 - Maximum Points You Can Obtain from Cards.
Solution	1424 - Diagonal Traverse II.
Solution	1425 - Constrained Subsequence Sum.
Solution	1431 - Kids With the Greatest Number of Candies.
Solution	1432 - Max Difference You Can Get From Changing an Integer.
Solution	1433 - Check If a String Can Break Another String.
Solution	1434 - Number of Ways to Wear Different Hats to Each Other.
Solution	1436 - Destination City.
Solution	1437 - Check If All 1’s Are at Least Length K Places Away.
Solution	1438 - Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit.
Solution	1439 - Find the Kth Smallest Sum of a Matrix With Sorted Rows.
Solution	1441 - Build an Array With Stack Operations.
Solution	1442 - Count Triplets That Can Form Two Arrays of Equal XOR.
Solution	1443 - Minimum Time to Collect All Apples in a Tree.
Solution	1444 - Number of Ways of Cutting a Pizza.
Solution	1446 - Consecutive Characters.
Solution	1447 - Simplified Fractions.
Solution	1448 - Count Good Nodes in Binary Tree.
Solution	1449 - Form Largest Integer With Digits That Add up to Target.
Solution	1450 - Number of Students Doing Homework at a Given Time.
Solution	1451 - Rearrange Words in a Sentence.
Solution	1452 - People Whose List of Favorite Companies Is Not a Subset of Another List.
Solution	1453 - Maximum Number of Darts Inside of a Circular Dartboard.
Solution	1455 - Check If a Word Occurs As a Prefix of Any Word in a Sentence.
Solution	1456 - Maximum Number of Vowels in a Substring of Given Length.
Solution	1457 - Pseudo-Palindromic Paths in a Binary Tree.
Solution	1458 - Max Dot Product of Two Subsequences.
Solution	1460 - Make Two Arrays Equal by Reversing Sub-arrays.
Solution	1461 - Check If a String Contains All Binary Codes of Size K.
Solution	1462 - Course Schedule IV.
Solution	1463 - Cherry Pickup II.
Solution	1464 - Maximum Product of Two Elements in an Array.
Solution	1465 - Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts.
Solution	1466 - Reorder Routes to Make All Paths Lead to the City Zero.
Solution	1467 - Probability of a Two Boxes Having The Same Number of Distinct Balls.
Solution	1470 - Shuffle the Array.
Solution	1471 - The k Strongest Values in an Array.
Solution	1473 - Paint House III.
Solution	1475 - Final Prices With a Special Discount in a Shop.
Solution	1477 - Find Two Non-overlapping Sub-arrays Each With Target Sum.
Solution	1478 - Allocate Mailboxes.
Solution	1480 - Running Sum of 1d Array.
Solution	1481 - Least Number of Unique Integers after K Removals.
Solution	1482 - Minimum Number of Days to Make m Bouquets.
Solution	1486 - XOR Operation in an Array.
Solution	1487 - Making File Names Unique.
Solution	1488 - Avoid Flood in The City.
Solution	1489 - Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree.
Solution	1491 - Average Salary Excluding the Minimum and Maximum Salary.
Solution	1492 - The kth Factor of n.
Solution	1493 - Longest Subarray of 1’s After Deleting One Element.
Solution	1494 - Parallel Courses II.
Solution	1496 - Path Crossing.
Solution	1497 - Check If Array Pairs Are Divisible by k.
Solution	1498 - Number of Subsequences That Satisfy the Given Sum Condition.
Solution	1499 - Max Value of Equation.
Solution	1502 - Can Make Arithmetic Progression From Sequence.
Solution	1503 - Last Moment Before All Ants Fall Out of a Plank.
Solution	1504 - Count Submatrices With All Ones.
Solution	1505 - Minimum Possible Integer After at Most K Adjacent Swaps On Digits.
Solution	1507 - Reformat Date.
Solution	1508 - Range Sum of Sorted Subarray Sums.
Solution	1509 - Minimum Difference Between Largest and Smallest Value in Three Moves.
Solution	1510 - Stone Game IV.
Solution	1512 - Number of Good Pairs.
Solution	1513 - Number of Substrings With Only 1s.
Solution	1514 - Path with Maximum Probability.
Solution	1515 - Best Position for a Service Centre.
Solution	1518 - Water Bottles.
Solution	1519 - Number of Nodes in the Sub-Tree With the Same Label.
Solution	1520 - Maximum Number of Non-Overlapping Substrings.
Solution	1521 - Find a Value of a Mysterious Function Closest to Target.
Solution	1523 - Count Odd Numbers in an Interval Range.
Solution	1524 - Number of Sub-arrays With Odd Sum.
Solution	1525 - Number of Good Ways to Split a String.
Solution	1526 - Minimum Number of Increments on Subarrays to Form a Target Array.
Solution	1528 - Shuffle String.
Solution	1529 - Minimum Suffix Flips.
Solution	1530 - Number of Good Leaf Nodes Pairs.
Solution	1531 - String Compression II.
Solution	1534 - Count Good Triplets.
Solution	1535 - Find the Winner of an Array Game.
Solution	1536 - Minimum Swaps to Arrange a Binary Grid.
Solution	1537 - Get the Maximum Score.
Solution	1539 - Kth Missing Positive Number.
Solution	1540 - Can Convert String in K Moves.
Solution	1541 - Minimum Insertions to Balance a Parentheses String.
Solution	1542 - Find Longest Awesome Substring.
Solution	1544 - Make The String Great.
Solution	1545 - Find Kth Bit in Nth Binary String.
Solution	1546 - Maximum Number of Non-Overlapping Subarrays With Sum Equals Target.
Solution	1547 - Minimum Cost to Cut a Stick.
Solution	1550 - Three Consecutive Odds.
Solution	1551 - Minimum Operations to Make Array Equal.
Solution	1552 - Magnetic Force Between Two Balls.
Solution	1553 - Minimum Number of Days to Eat N Oranges.
Solution	1556 - Thousand Separator.
Solution	1557 - Minimum Number of Vertices to Reach All Nodes.
Solution	1558 - Minimum Numbers of Function Calls to Make Target Array.
Solution	1559 - Detect Cycles in 2D Grid.
Solution	1560 - Most Visited Sector in a Circular Track.
Solution	1561 - Maximum Number of Coins You Can Get.
Solution	1562 - Find Latest Group of Size M.
Solution	1563 - Stone Game V.
Solution	1566 - Detect Pattern of Length M Repeated K or More Times.
Solution	1567 - Maximum Length of Subarray With Positive Product.
Solution	1568 - Minimum Number of Days to Disconnect Island.
Solution	1569 - Number of Ways to Reorder Array to Get Same BST.
Solution	1572 - Matrix Diagonal Sum.
Solution	1573 - Number of Ways to Split a String.
Solution	1574 - Shortest Subarray to be Removed to Make Array Sorted.
Solution	1575 - Count All Possible Routes.
Solution	1576 - Replace All ?’
Solution	1577 - Number of Ways Where Square of Number Is Equal to Product of Two Numbers.
Solution	1578 - Minimum Time to Make Rope Colorful.
Solution	1579 - Remove Max Number of Edges to Keep Graph Fully Traversable.
Solution	1582 - Special Positions in a Binary Matrix.
Solution	1583 - Count Unhappy Friends.
Solution	1584 - Min Cost to Connect All Points.
Solution	1585 - Check If String Is Transformable With Substring Sort Operations.
Solution	1588 - Sum of All Odd Length Subarrays.
Solution	1589 - Maximum Sum Obtained of Any Permutation.
Solution	1590 - Make Sum Divisible by P.
Solution	1591 - Strange Printer II.
Solution	1592 - Rearrange Spaces Between Words.
Solution	1593 - Split a String Into the Max Number of Unique Substrings.
Solution	1594 - Maximum Non Negative Product in a Matrix.
Solution	1595 - Minimum Cost to Connect Two Groups of Points.
Solution	1598 - Crawler Log Folder.
Solution	1599 - Maximum Profit of Operating a Centennial Wheel.
Solution	1601 - Maximum Number of Achievable Transfer Requests.
Solution	1604 - Alert Using Same Key-Card Three or More Times in a One Hour Period.
Solution	1605 - Find Valid Matrix Given Row and Column Sums.
Solution	1606 - Find Servers That Handled Most Number of Requests.
Solution	1608 - Special Array With X Elements Greater Than or Equal X.
Solution	1609 - Even Odd Tree.
Solution	1610 - Maximum Number of Visible Points.
Solution	1611 - Minimum One Bit Operations to Make Integers Zero.
Solution	1614 - Maximum Nesting Depth of the Parentheses.
Solution	1615 - Maximal Network Rank.
Solution	1616 - Split Two Strings to Make Palindrome.
Solution	1617 - Count Subtrees With Max Distance Between Cities.
Solution	1619 - Mean of Array After Removing Some Elements.
Solution	1620 - Coordinate With Maximum Network Quality.
Solution	1621 - Number of Sets of K Non-Overlapping Line Segments.
Solution	1624 - Largest Substring Between Two Equal Characters.
Solution	1625 - Lexicographically Smallest String After Applying Operations.
Solution	1626 - Best Team With No Conflicts.
Solution	1627 - Graph Connectivity With Threshold.
Solution	1629 - Slowest Key.
Solution	1630 - Arithmetic Subarrays.
Solution	1631 - Path With Minimum Effort.
Solution	1632 - Rank Transform of a Matrix.
Solution	1636 - Sort Array by Increasing Frequency.
Solution	1637 - Widest Vertical Area Between Two Points Containing No Points.
Solution	1638 - Count Substrings That Differ by One Character.
Solution	1639 - Number of Ways to Form a Target String Given a Dictionary.
Solution	1640 - Check Array Formation Through Concatenation.
Solution	1641 - Count Sorted Vowel Strings.
Solution	1642 - Furthest Building You Can Reach.
Solution	1643 - Kth Smallest Instructions.
Solution	1646 - Get Maximum in Generated Array.
Solution	1647 - Minimum Deletions to Make Character Frequencies Unique.
Solution	1648 - Sell Diminishing-Valued Colored Balls.
Solution	1649 - Create Sorted Array through Instructions.
Solution	1652 - Defuse the Bomb.
Solution	1653 - Minimum Deletions to Make String Balanced.
Solution	1654 - Minimum Jumps to Reach Home.
Solution	1655 - Distribute Repeating Integers.
Solution	1657 - Determine if Two Strings Are Close.
Solution	1658 - Minimum Operations to Reduce X to Zero.
Solution	1659 - Maximize Grid Happiness.
Solution	1662 - Check If Two String Arrays are Equivalent.
Solution	1663 - Smallest String With A Given Numeric Value.
Solution	1664 - Ways to Make a Fair Array.
Solution	1665 - Minimum Initial Energy to Finish Tasks.
Solution	1668 - Maximum Repeating Substring.
Solution	1669 - Merge In Between Linked Lists.
Solution	1671 - Minimum Number of Removals to Make Mountain Array.
Solution	1672 - Richest Customer Wealth.
Solution	1673 - Find the Most Competitive Subsequence.
Solution	1674 - Minimum Moves to Make Array Complementary.
Solution	1675 - Minimize Deviation in Array.
Solution	1678 - Goal Parser Interpretation.
Solution	1679 - Max Number of K-Sum Pairs.
Solution	1680 - Concatenation of Consecutive Binary Numbers.
Solution	1681 - Minimum Incompatibility.
Solution	1684 - Count the Number of Consistent Strings.
Solution	1685 - Sum of Absolute Differences in a Sorted Array.
Solution	1686 - Stone Game VI.
Solution	1687 - Delivering Boxes from Storage to Ports.
Solution	1688 - Count of Matches in Tournament.
Solution	1689 - Partitioning Into Minimum Number Of Deci-Binary Numbers.
Solution	1690 - Stone Game VII.
Solution	1691 - Maximum Height by Stacking Cuboids.
Solution	1694 - Reformat Phone Number.
Solution	1695 - Maximum Erasure Value.
Solution	1696 - Jump Game VI.
Solution	1697 - Checking Existence of Edge Length Limited Paths.
Solution	1700 - Number of Students Unable to Eat Lunch.
Solution	1701 - Average Waiting Time.
Solution	1702 - Maximum Binary String After Change.
Solution	1703 - Minimum Adjacent Swaps for K Consecutive Ones.
Solution	1704 - Determine if String Halves Are Alike.
Solution	1705 - Maximum Number of Eaten Apples.
Solution	1706 - Where Will the Ball Fall.
Solution	1707 - Maximum XOR With an Element From Array.
Solution	1710 - Maximum Units on a Truck.
Solution	1711 - Count Good Meals.
Solution	1712 - Ways to Split Array Into Three Subarrays.
Solution	1713 - Minimum Operations to Make a Subsequence.
Solution	1716 - Calculate Money in Leetcode Bank.
Solution	1717 - Maximum Score From Removing Substrings.
Solution	1718 - Construct the Lexicographically Largest Valid Sequence.
Solution	1719 - Number Of Ways To Reconstruct A Tree.
Solution	1720 - Decode XORed Array.
Solution	1721 - Swapping Nodes in a Linked List.
Solution	1722 - Minimize Hamming Distance After Swap Operations.
Solution	1723 - Find Minimum Time to Finish All Jobs.
Solution	1725 - Number Of Rectangles That Can Form The Largest Square.
Solution	1726 - Tuple with Same Product.
Solution	1727 - Largest Submatrix With Rearrangements.
Solution	1728 - Cat and Mouse II.
Solution	1732 - Find the Highest Altitude.
Solution	1733 - Minimum Number of People to Teach.
Solution	1734 - Decode XORed Permutation.
Solution	1735 - Count Ways to Make Array With Product.
Solution	1736 - Latest Time by Replacing Hidden Digits.
Solution	1737 - Change Minimum Characters to Satisfy One of Three Conditions.
Solution	1738 - Find Kth Largest XOR Coordinate Value.
Solution	1739 - Building Boxes.
Solution	1742 - Maximum Number of Balls in a Box.
Solution	1743 - Restore the Array From Adjacent Pairs.
Solution	1744 - Can You Eat Your Favorite Candy on Your Favorite Day?
Solution	1745 - Palindrome Partitioning IV.
Solution	1748 - Sum of Unique Elements.
Solution	1749 - Maximum Absolute Sum of Any Subarray.
Solution	1750 - Minimum Length of String After Deleting Similar Ends.
Solution	1751 - Maximum Number of Events That Can Be Attended II.
Solution	1752 - Check if Array Is Sorted and Rotated.
Solution	1753 - Maximum Score From Removing Stones.
Solution	1754 - Largest Merge Of Two Strings.
Solution	1755 - Closest Subsequence Sum.
Solution	1758 - Minimum Changes To Make Alternating Binary String.
Solution	1759 - Count Number of Homogenous Substrings.
Solution	1760 - Minimum Limit of Balls in a Bag.
Solution	1761 - Minimum Degree of a Connected Trio in a Graph.
Solution	1763 - Longest Nice Substring.
Solution	1764 - Form Array by Concatenating Subarrays of Another Array.
Solution	1765 - Map of Highest Peak.
Solution	1766 - Tree of Coprimes.
Solution	1768 - Merge Strings Alternately.
Solution	1769 - Minimum Number of Operations to Move All Balls to Each Box.
Solution	1770 - Maximum Score from Performing Multiplication Operations.
Solution	1771 - Maximize Palindrome Length From Subsequences.
Solution	1773 - Count Items Matching a Rule.
Solution	1774 - Closest Dessert Cost.
Solution	1775 - Equal Sum Arrays With Minimum Number of Operations.
Solution	1776 - Car Fleet II.
Solution	1779 - Find Nearest Point That Has the Same X or Y Coordinate.
Solution	1780 - Check if Number is a Sum of Powers of Three.
Solution	1781 - Sum of Beauty of All Substrings.
Solution	1782 - Count Pairs Of Nodes.
Solution	1784 - Check if Binary String Has at Most One Segment of Ones.
Solution	1785 - Minimum Elements to Add to Form a Given Sum.
Solution	1786 - Number of Restricted Paths From First to Last Node.
Solution	1787 - Make the XOR of All Segments Equal to Zero.
Solution	1790 - Check if One String Swap Can Make Strings Equal.
Solution	1791 - Find Center of Star Graph.
Solution	1792 - Maximum Average Pass Ratio.
Solution	1793 - Maximum Score of a Good Subarray.
Solution	1796 - Second Largest Digit in a String.
Solution	1798 - Maximum Number of Consecutive Values You Can Make.
Solution	1799 - Maximize Score After N Operations.
Solution	1800 - Maximum Ascending Subarray Sum.
Solution	1801 - Number of Orders in the Backlog.
Solution	1802 - Maximum Value at a Given Index in a Bounded Array.
Solution	1803 - Count Pairs With XOR in a Range.
Solution	1805 - Number of Different Integers in a String.
Solution	1806 - Minimum Number of Operations to Reinitialize a Permutation.
Solution	1807 - Evaluate the Bracket Pairs of a String.
Solution	1808 - Maximize Number of Nice Divisors.
Solution	1812 - Determine Color of a Chessboard Square.
Solution	1813 - Sentence Similarity III.
Solution	1814 - Count Nice Pairs in an Array.
Solution	1815 - Maximum Number of Groups Getting Fresh Donuts.
Solution	1816 - Truncate Sentence.
Solution	1817 - Finding the Users Active Minutes.
Solution	1818 - Minimum Absolute Sum Difference.
Solution	1819 - Number of Different Subsequences GCDs.
Solution	1822 - Sign of the Product of an Array.
Solution	1823 - Find the Winner of the Circular Game.
Solution	1824 - Minimum Sideway Jumps.
Solution	1827 - Minimum Operations to Make the Array Increasing.
Solution	1828 - Queries on Number of Points Inside a Circle.
Solution	1829 - Maximum XOR for Each Query.
Solution	1830 - Minimum Number of Operations to Make String Sorted.
Solution	1832 - Check if the Sentence Is Pangram.
Solution	1833 - Maximum Ice Cream Bars.
Solution	1834 - Single-Threaded CPU.
Solution	1835 - Find XOR Sum of All Pairs Bitwise AND.
Solution	1837 - Sum of Digits in Base K.
Solution	1838 - Frequency of the Most Frequent Element.
Solution	1839 - Longest Substring Of All Vowels in Order.
Solution	1840 - Maximum Building Height.
Solution	1844 - Replace All Digits with Characters.
Solution	1846 - Maximum Element After Decreasing and Rearranging.
Solution	1847 - Closest Room.
Solution	1848 - Minimum Distance to the Target Element.
Solution	1849 - Splitting a String Into Descending Consecutive Values.
Solution	1850 - Minimum Adjacent Swaps to Reach the Kth Smallest Number.
Solution	1851 - Minimum Interval to Include Each Query.
Solution	1854 - Maximum Population Year.
Solution	1855 - Maximum Distance Between a Pair of Values.
Solution	1856 - Maximum Subarray Min-Product.
Solution	1857 - Largest Color Value in a Directed Graph.
Solution	1859 - Sorting the Sentence.
Solution	1860 - Incremental Memory Leak.
Solution	1861 - Rotating the Box.
Solution	1862 - Sum of Floored Pairs.
Solution	1863 - Sum of All Subset XOR Totals.
Solution	1864 - Minimum Number of Swaps to Make the Binary String Alternating.
Solution	1866 - Number of Ways to Rearrange Sticks With K Sticks Visible.
Solution	1869 - Longer Contiguous Segments of Ones than Zeros.
Solution	1870 - Minimum Speed to Arrive on Time.
Solution	1871 - Jump Game VII.
Solution	1872 - Stone Game VIII.
Solution	1876 - Substrings of Size Three with Distinct Characters.
Solution	1877 - Minimize Maximum Pair Sum in Array.
Solution	1878 - Get Biggest Three Rhombus Sums in a Grid.
Solution	1879 - Minimum XOR Sum of Two Arrays.
Solution	1880 - Check if Word Equals Summation of Two Words.
Solution	1881 - Maximum Value after Insertion.
Solution	1882 - Process Tasks Using Servers.
Solution	1883 - Minimum Skips to Arrive at Meeting On Time.
Solution	1884 - Egg Drop With 2 Eggs and N Floors.
Solution	1886 - Determine Whether Matrix Can Be Obtained By Rotation.
Solution	1887 - Reduction Operations to Make the Array Elements Equal.
Solution	1888 - Minimum Number of Flips to Make the Binary String Alternating.
Solution	1889 - Minimum Space Wasted From Packaging.
Solution	1893 - Check if All the Integers in a Range Are Covered.
Solution	1894 - Find the Student that Will Replace the Chalk.
Solution	1895 - Largest Magic Square.
Solution	1896 - Minimum Cost to Change the Final Value of Expression.
Solution	1897 - Redistribute Characters to Make All Strings Equal.
Solution	1898 - Maximum Number of Removable Characters.
Solution	1899 - Merge Triplets to Form Target Triplet.
Solution	1900 - The Earliest and Latest Rounds Where Players Compete.
Solution	1901 - Find a Peak Element II.
Solution	1903 - Largest Odd Number in String.
Solution	1904 - The Number of Full Rounds You Have Played.
Solution	1905 - Count Sub Islands.
Solution	1906 - Minimum Absolute Difference Queries.
Solution	1909 - Remove One Element to Make the Array Strictly Increasing.
Solution	1910 - Remove All Occurrences of a Substring.
Solution	1911 - Maximum Alternating Subsequence Sum.
Solution	1913 - Maximum Product Difference Between Two Pairs.
Solution	1914 - Cyclically Rotating a Grid.
Solution	1915 - Number of Wonderful Substrings.
Solution	1916 - Count Ways to Build Rooms in an Ant Colony.
Solution	1920 - Build Array from Permutation.
Solution	1921 - Eliminate Maximum Number of Monsters.
Solution	1922 - Count Good Numbers.
Solution	1923 - Longest Common Subpath.
Solution	1925 - Count Square Sum Triples.
Solution	1926 - Nearest Exit from Entrance in Maze.
Solution	1927 - Sum Game.
Solution	1928 - Minimum Cost to Reach Destination in Time.
Solution	1929 - Concatenation of Array.
Solution	1930 - Unique Length-3 Palindromic Subsequences.
Solution	1931 - Painting a Grid With Three Different Colors.
Solution	1932 - Merge BSTs to Create Single BST.
Solution	1935 - Maximum Number of Words You Can Type.
Solution	1936 - Add Minimum Number of Rungs.
Solution	1937 - Maximum Number of Points with Cost.
Solution	1938 - Maximum Genetic Difference Query.
Solution	1941 - Check if All Characters Have Equal Number of Occurrences.
Solution	1942 - The Number of the Smallest Unoccupied Chair.
Solution	1943 - Describe the Painting.
Solution	1944 - Number of Visible People in a Queue.
Solution	1945 - Sum of Digits of String After Convert.
Solution	1946 - Largest Number After Mutating Substring.
Solution	1947 - Maximum Compatibility Score Sum.
Solution	1948 - Delete Duplicate Folders in System.
Solution	1952 - Three Divisors.
Solution	1953 - Maximum Number of Weeks for Which You Can Work.
Solution	1954 - Minimum Garden Perimeter to Collect Enough Apples.
Solution	1955 - Count Number of Special Subsequences.
Solution	1957 - Delete Characters to Make Fancy String.
Solution	1958 - Check if Move is Legal.
Solution	1959 - Minimum Total Space Wasted With K Resizing Operations.
Solution	1960 - Maximum Product of the Length of Two Palindromic Substrings.
Solution	1961 - Check If String Is a Prefix of Array.
Solution	1962 - Remove Stones to Minimize the Total.
Solution	1963 - Minimum Number of Swaps to Make the String Balanced.
Solution	1964 - Find the Longest Valid Obstacle Course at Each Position.
Solution	1967 - Number of Strings That Appear as Substrings in Word.
Solution	1968 - Array With Elements Not Equal to Average of Neighbors.
Solution	1969 - Minimum Non-Zero Product of the Array Elements.
Solution	1970 - Last Day Where You Can Still Cross.
Solution	1971 - Find if Path Exists in Graph.
Solution	1974 - Minimum Time to Type Word Using Special Typewriter.
Solution	1975 - Maximum Matrix Sum.
Solution	1976 - Number of Ways to Arrive at Destination.
Solution	1977 - Number of Ways to Separate Numbers.
Solution	1979 - Find Greatest Common Divisor of Array.
Solution	1980 - Find Unique Binary String.
Solution	1981 - Minimize the Difference Between Target and Chosen Elements.
Solution	1982 - Find Array Given Subset Sums.
Solution	1984 - Minimum Difference Between Highest and Lowest of K Scores.
Solution	1985 - Find the Kth Largest Integer in the Array.
Solution	1986 - Minimum Number of Work Sessions to Finish the Tasks.
Solution	1987 - Number of Unique Good Subsequences.
Solution	1991 - Find the Middle Index in Array.
Solution	1992 - Find All Groups of Farmland.
Solution	1994 - The Number of Good Subsets.
Solution	1995 - Count Special Quadruplets.
Solution	1996 - The Number of Weak Characters in the Game.
Solution	1997 - First Day Where You Have Been in All the Rooms.
Solution	1998 - GCD Sort of an Array.
Solution	2000 - Reverse Prefix of Word.
Solution	2001 - Number of Pairs of Interchangeable Rectangles.
Solution	2002 - Maximum Product of the Length of Two Palindromic Subsequences.
Solution	2003 - Smallest Missing Genetic Value in Each Subtree.
Solution	2006 - Count Number of Pairs With Absolute Difference K.
Solution	2007 - Find Original Array From Doubled Array.
Solution	2008 - Maximum Earnings From Taxi.
Solution	2009 - Minimum Number of Operations to Make Array Continuous.
Solution	2011 - Final Value of Variable After Performing Operations.
Solution	2012 - Sum of Beauty in the Array.
Solution	2014 - Longest Subsequence Repeated k Times.
Solution	2016 - Maximum Difference Between Increasing Elements.
Solution	2017 - Grid Game.
Solution	2018 - Check if Word Can Be Placed In Crossword.
Solution	2019 - The Score of Students Solving Math Expression.
Solution	2022 - Convert 1D Array Into 2D Array.
Solution	2023 - Number of Pairs of Strings With Concatenation Equal to Target.
Solution	2024 - Maximize the Confusion of an Exam.
Solution	2025 - Maximum Number of Ways to Partition an Array.
Solution	2027 - Minimum Moves to Convert String.
Solution	2028 - Find Missing Observations.
Solution	2029 - Stone Game IX.
Solution	2030 - Smallest K-Length Subsequence With Occurrences of a Letter.
Solution	2032 - Two Out of Three.
Solution	2033 - Minimum Operations to Make a Uni-Value Grid.
Solution	2035 - Partition Array Into Two Arrays to Minimize Sum Difference.
Solution	2037 - Minimum Number of Moves to Seat Everyone.
Solution	2038 - Remove Colored Pieces if Both Neighbors are the Same Color.
Solution	2039 - The Time When the Network Becomes Idle.
Solution	2040 - Kth Smallest Product of Two Sorted Arrays.
Solution	2042 - Check if Numbers Are Ascending in a Sentence.
Solution	2044 - Count Number of Maximum Bitwise-OR Subsets.
Solution	2045 - Second Minimum Time to Reach Destination.
Solution	2047 - Number of Valid Words in a Sentence.
Solution	2048 - Next Greater Numerically Balanced Number.
Solution	2049 - Count Nodes With the Highest Score.
Solution	2050 - Parallel Courses III.
Solution	2053 - Kth Distinct String in an Array.
Solution	2054 - Two Best Non-Overlapping Events.
Solution	2055 - Plates Between Candles.
Solution	2056 - Number of Valid Move Combinations On Chessboard.
Solution	2057 - Smallest Index With Equal Value.
Solution	2058 - Find the Minimum and Maximum Number of Nodes Between Critical Points.
Solution	2059 - Minimum Operations to Convert Number.
Solution	2060 - Check if an Original String Exists Given Two Encoded Strings.
Solution	2062 - Count Vowel Substrings of a String.
Solution	2063 - Vowels of All Substrings.
Solution	2064 - Minimized Maximum of Products Distributed to Any Store.
Solution	2065 - Maximum Path Quality of a Graph.
Solution	2068 - Check Whether Two Strings are Almost Equivalent.
Solution	2070 - Most Beautiful Item for Each Query.
Solution	2071 - Maximum Number of Tasks You Can Assign.
Solution	2073 - Time Needed to Buy Tickets.
Solution	2074 - Reverse Nodes in Even Length Groups.
Solution	2075 - Decode the Slanted Ciphertext.
Solution	2076 - Process Restricted Friend Requests.
Solution	2078 - Two Furthest Houses With Different Colors.
Solution	2079 - Watering Plants.
Solution	2081 - Sum of k-Mirror Numbers.
Solution	2085 - Count Common Words With One Occurrence.
Solution	2086 - Minimum Number of Buckets Required to Collect Rainwater from Houses.
Solution	2087 - Minimum Cost Homecoming of a Robot in a Grid.
Solution	2088 - Count Fertile Pyramids in a Land.
Solution	2089 - Find Target Indices After Sorting Array.
Solution	2090 - K Radius Subarray Averages.
Solution	2091 - Removing Minimum and Maximum From Array.
Solution	2092 - Find All People With Secret.
Solution	2094 - Finding 3-Digit Even Numbers.
Solution	2095 - Delete the Middle Node of a Linked List.
Solution	2096 - Step-By-Step Directions From a Binary Tree Node to Another.
Solution	2097 - Valid Arrangement of Pairs.
Solution	2099 - Find Subsequence of Length K With the Largest Sum.
Solution	2100 - Find Good Days to Rob the Bank.
Solution	2101 - Detonate the Maximum Bombs.
Solution	2103 - Rings and Rods.
Solution	2104 - Sum of Subarray Ranges.
Solution	2105 - Watering Plants II.
Solution	2106 - Maximum Fruits Harvested After at Most K Steps.
Solution	2108 - Find First Palindromic String in the Array.
Solution	2109 - Adding Spaces to a String.
Solution	2110 - Number of Smooth Descent Periods of a Stock.
Solution	2111 - Minimum Operations to Make the Array K-Increasing.
Solution	2114 - Maximum Number of Words Found in Sentences.
Solution	2115 - Find All Possible Recipes from Given Supplies.
Solution	2116 - Check if a Parentheses String Can Be Valid.
Solution	2117 - Abbreviating the Product of a Range.
Solution	2119 - A Number After a Double Reversal.
Solution	2120 - Execution of All Suffix Instructions Staying in a Grid.
Solution	2121 - Intervals Between Identical Elements.
Solution	2122 - Recover the Original Array.
Solution	2124 - Check if All A’s Appears Before All B’s.
Solution	2125 - Number of Laser Beams in a Bank.
Solution	2126 - Destroying Asteroids.
Solution	2127 - Maximum Employees to Be Invited to a Meeting.
Solution	2129 - Capitalize the Title.
Solution	2130 - Maximum Twin Sum of a Linked List.
Solution	2131 - Longest Palindrome by Concatenating Two Letter Words.
Solution	2132 - Stamping the Grid.
Solution	2133 - Check if Every Row and Column Contains All Numbers.
Solution	2134 - Minimum Swaps to Group All 1’s Together II.
Solution	2135 - Count Words Obtained After Adding a Letter.
Solution	2136 - Earliest Possible Day of Full Bloom.
Solution	2138 - Divide a String Into Groups of Size k.
Solution	2139 - Minimum Moves to Reach Target Score.
Solution	2140 - Solving Questions With Brainpower.
Solution	2141 - Maximum Running Time of N Computers.
Solution	2144 - Minimum Cost of Buying Candies With Discount.
Solution	2145 - Count the Hidden Sequences.
Solution	2146 - K Highest Ranked Items Within a Price Range.
Solution	2147 - Number of Ways to Divide a Long Corridor.
Solution	2148 - Count Elements With Strictly Smaller and Greater Elements.
Solution	2149 - Rearrange Array Elements by Sign.
Solution	2150 - Find All Lonely Numbers in the Array.
Solution	2151 - Maximum Good People Based on Statements.
Solution	2154 - Keep Multiplying Found Values by Two.
Solution	2155 - All Divisions With the Highest Score of a Binary Array.
Solution	2156 - Find Substring With Given Hash Value.
Solution	2157 - Groups of Strings.
Solution	2160 - Minimum Sum of Four Digit Number After Splitting Digits.
Solution	2161 - Partition Array According to Given Pivot.
Solution	2162 - Minimum Cost to Set Cooking Time.
Solution	2163 - Minimum Difference in Sums After Removal of Elements.
Solution	2164 - Sort Even and Odd Indices Independently.
Solution	2165 - Smallest Value of the Rearranged Number.
Solution	2167 - Minimum Time to Remove All Cars Containing Illegal Goods.
Solution	2169 - Count Operations to Obtain Zero.
Solution	2170 - Minimum Operations to Make the Array Alternating.
Solution	2171 - Removing Minimum Number of Magic Beans.
Solution	2172 - Maximum AND Sum of Array.
Solution	2176 - Count Equal and Divisible Pairs in an Array.
Solution	2177 - Find Three Consecutive Integers That Sum to a Given Number.
Solution	2178 - Maximum Split of Positive Even Integers.
Solution	2179 - Count Good Triplets in an Array.
Solution	2180 - Count Integers With Even Digit Sum.
Solution	2181 - Merge Nodes in Between Zeros.
Solution	2182 - Construct String With Repeat Limit.
Solution	2183 - Count Array Pairs Divisible by K.
Solution	2185 - Counting Words With a Given Prefix.
Solution	2186 - Minimum Number of Steps to Make Two Strings Anagram II.
Solution	2187 - Minimum Time to Complete Trips.
Solution	2188 - Minimum Time to Finish the Race.
Solution	2190 - Most Frequent Number Following Key In an Array.
Solution	2191 - Sort the Jumbled Numbers.
Solution	2192 - All Ancestors of a Node in a Directed Acyclic Graph.
Solution	2193 - Minimum Number of Moves to Make Palindrome.
Solution	2194 - Cells in a Range on an Excel Sheet.
Solution	2195 - Append K Integers With Minimal Sum.
Solution	2196 - Create Binary Tree From Descriptions.
Solution	2197 - Replace Non-Coprime Numbers in Array.
Solution	2200 - Find All K-Distant Indices in an Array.
Solution	2201 - Count Artifacts That Can Be Extracted.
Solution	2202 - Maximize the Topmost Element After K Moves.
Solution	2203 - Minimum Weighted Subgraph With the Required Paths.
Solution	2206 - Divide Array Into Equal Pairs.
Solution	2207 - Maximize Number of Subsequences in a String.
Solution	2208 - Minimum Operations to Halve Array Sum.
Solution	2209 - Minimum White Tiles After Covering With Carpets.
Solution	2210 - Count Hills and Valleys in an Array.
Solution	2211 - Count Collisions on a Road.
Solution	2212 - Maximum Points in an Archery Competition.
Solution	2213 - Longest Substring of One Repeating Character.
Solution	2215 - Find the Difference of Two Arrays.
Solution	2216 - Minimum Deletions to Make Array Beautiful.
Solution	2217 - Find Palindrome With Fixed Length.
Solution	2218 - Maximum Value of K Coins From Piles.
Solution	2220 - Minimum Bit Flips to Convert Number.
Solution	2221 - Find Triangular Sum of an Array.
Solution	2222 - Number of Ways to Select Buildings.
Solution	2223 - Sum of Scores of Built Strings.
Solution	2224 - Minimum Number of Operations to Convert Time.
Solution	2225 - Find Players With Zero or One Losses.
Solution	2226 - Maximum Candies Allocated to K Children.
Solution	2231 - Largest Number After Digit Swaps by Parity.
Solution	2232 - Minimize Result by Adding Parentheses to Expression.
Solution	2233 - Maximum Product After K Increments.
Solution	2234 - Maximum Total Beauty of the Gardens.
Solution	2235 - Add Two Integers.
Solution	2236 - Root Equals Sum of Children.
Solution	2239 - Find Closest Number to Zero.
Solution	2240 - Number of Ways to Buy Pens and Pencils.
Solution	2242 - Maximum Score of a Node Sequence.
Solution	2243 - Calculate Digit Sum of a String.
Solution	2244 - Minimum Rounds to Complete All Tasks.
Solution	2245 - Maximum Trailing Zeros in a Cornered Path.
Solution	2246 - Longest Path With Different Adjacent Characters.
Solution	2248 - Intersection of Multiple Arrays.
Solution	2249 - Count Lattice Points Inside a Circle.
Solution	2250 - Count Number of Rectangles Containing Each Point.
Solution	2251 - Number of Flowers in Full Bloom.
Solution	2255 - Count Prefixes of a Given String.
Solution	2256 - Minimum Average Difference.
Solution	2257 - Count Unguarded Cells in the Grid.
Solution	2258 - Escape the Spreading Fire.
Solution	2259 - Remove Digit From Number to Maximize Result.
Solution	2260 - Minimum Consecutive Cards to Pick Up.
Solution	2261 - K Divisible Elements Subarrays.
Solution	2262 - Total Appeal of A String.
Solution	2264 - Largest 3-Same-Digit Number in String.
Solution	2265 - Count Nodes Equal to Average of Subtree.
Solution	2266 - Count Number of Texts.
Solution	2267 - Check if There Is a Valid Parentheses String Path.
Solution	2269 - Find the K-Beauty of a Number.
Solution	2270 - Number of Ways to Split Array.
Solution	2271 - Maximum White Tiles Covered by a Carpet.
Solution	2272 - Substring With Largest Variance.
Solution	2273 - Find Resultant Array After Removing Anagrams.
Solution	2274 - Maximum Consecutive Floors Without Special Floors.
Solution	2275 - Largest Combination With Bitwise AND Greater Than Zero.
Solution	2278 - Percentage of Letter in String.
Solution	2279 - Maximum Bags With Full Capacity of Rocks.
Solution	2280 - Minimum Lines to Represent a Line Chart.
Solution	2281 - Sum of Total Strength of Wizards.
Solution	2283 - Check if Number Has Equal Digit Count and Digit Value.
Solution	2284 - Sender With Largest Word Count.
Solution	2285 - Maximum Total Importance of Roads.
Solution	2287 - Rearrange Characters to Make Target String.
Solution	2288 - Apply Discount to Prices.
Solution	2289 - Steps to Make Array Non-decreasing.
Solution	2290 - Minimum Obstacle Removal to Reach Corner.
Solution	2293 - Min Max Game.
Solution	2294 - Partition Array Such That Maximum Difference Is K.
Solution	2295 - Replace Elements in an Array.
Solution	2299 - Strong Password Checker II.
Solution	2300 - Successful Pairs of Spells and Potions.
Solution	2301 - Match Substring After Replacement.
Solution	2302 - Count Subarrays With Score Less Than K.
Solution	2303 - Calculate Amount Paid in Taxes.
Solution	2304 - Minimum Path Cost in a Grid.
Solution	2305 - Fair Distribution of Cookies.
Solution	2306 - Naming a Company.
Solution	2309 - Greatest English Letter in Upper and Lower Case.
Solution	2310 - Sum of Numbers With Units Digit K.
Solution	2311 - Longest Binary Subsequence Less Than or Equal to K.
Solution	2312 - Selling Pieces of Wood.
Solution	2315 - Count Asterisks.
Solution	2316 - Count Unreachable Pairs of Nodes in an Undirected Graph.
Solution	2317 - Maximum XOR After Operations.
Solution	2318 - Number of Distinct Roll Sequences.
Solution	2319 - Check if Matrix Is X-Matrix.
Solution	2320 - Count Number of Ways to Place Houses.
Solution	2321 - Maximum Score Of Spliced Array.
Solution	2322 - Minimum Score After Removals on a Tree.
Solution	2325 - Decode the Message.
Solution	2326 - Spiral Matrix IV.
Solution	2327 - Number of People Aware of a Secret.
Solution	2328 - Number of Increasing Paths in a Grid.
Solution	2331 - Evaluate Boolean Binary Tree.
Solution	2332 - The Latest Time to Catch a Bus.
Solution	2333 - Minimum Sum of Squared Difference.
Solution	2334 - Subarray With Elements Greater Than Varying Threshold.
Solution	2335 - Minimum Amount of Time to Fill Cups.
Solution	2337 - Move Pieces to Obtain a String.
Solution	2338 - Count the Number of Ideal Arrays.
Solution	2341 - Maximum Number of Pairs in Array.
Solution	2342 - Max Sum of a Pair With Equal Sum of Digits.
Solution	2343 - Query Kth Smallest Trimmed Number.
Solution	2344 - Minimum Deletions to Make Array Divisible.
Solution	2347 - Best Poker Hand.
Solution	2348 - Number of Zero-Filled Subarrays.
Solution	2350 - Shortest Impossible Sequence of Rolls.
Solution	2351 - First Letter to Appear Twice.
Solution	2352 - Equal Row and Column Pairs.
Solution	2354 - Number of Excellent Pairs.
Solution	2357 - Make Array Zero by Subtracting Equal Amounts.
Solution	2358 - Maximum Number of Groups Entering a Competition.
Solution	2359 - Find Closest Node to Given Two Nodes.
Solution	2360 - Longest Cycle in a Graph.
Solution	2363 - Merge Similar Items.
Solution	2364 - Count Number of Bad Pairs.
Solution	2365 - Task Scheduler II.
Solution	2366 - Minimum Replacements to Sort the Array.
Solution	2367 - Number of Arithmetic Triplets.
Solution	2368 - Reachable Nodes With Restrictions.
Solution	2369 - Check if There is a Valid Partition For The Array.
Solution	2370 - Longest Ideal Subsequence.
Solution	2373 - Largest Local Values in a Matrix.
Solution	2374 - Node With Highest Edge Score.
Solution	2375 - Construct Smallest Number From DI String.
Solution	2376 - Count Special Integers.
Solution	2379 - Minimum Recolors to Get K Consecutive Black Blocks.
Solution	2380 - Time Needed to Rearrange a Binary String.
Solution	2381 - Shifting Letters II.
Solution	2382 - Maximum Segment Sum After Removals.
Solution	2383 - Minimum Hours of Training to Win a Competition.
Solution	2384 - Largest Palindromic Number.
Solution	2385 - Amount of Time for Binary Tree to Be Infected.
Solution	2386 - Find the K-Sum of an Array.
Solution	2389 - Longest Subsequence With Limited Sum.
Solution	2390 - Removing Stars From a String.
Solution	2391 - Minimum Amount of Time to Collect Garbage.
Solution	2392 - Build a Matrix With Conditions.
Solution	2395 - Find Subarrays With Equal Sum.
Solution	2396 - Strictly Palindromic Number.
Solution	2397 - Maximum Rows Covered by Columns.
Solution	2398 - Maximum Number of Robots Within Budget.
Solution	2399 - Check Distances Between Same Letters.
Solution	2400 - Number of Ways to Reach a Position After Exactly k Steps.
Solution	2401 - Longest Nice Subarray.
Solution	2402 - Meeting Rooms III.
Solution	2404 - Most Frequent Even Element.
Solution	2405 - Optimal Partition of String.
Solution	2406 - Divide Intervals Into Minimum Number of Groups.
Solution	2407 - Longest Increasing Subsequence II.
Solution	2409 - Count Days Spent Together.
Solution	2410 - Maximum Matching of Players With Trainers.
Solution	2411 - Smallest Subarrays With Maximum Bitwise OR.
Solution	2412 - Minimum Money Required Before Transactions.
Solution	2413 - Smallest Even Multiple.
Solution	2414 - Length of the Longest Alphabetical Continuous Substring.
Solution	2415 - Reverse Odd Levels of Binary Tree.
Solution	2416 - Sum of Prefix Scores of Strings.
Solution	2418 - Sort the People.
Solution	2419 - Longest Subarray With Maximum Bitwise AND.
Solution	2420 - Find All Good Indices.
Solution	2421 - Number of Good Paths.
Solution	2423 - Remove Letter To Equalize Frequency.
Solution	2425 - Bitwise XOR of All Pairings.
Solution	2426 - Number of Pairs Satisfying Inequality.
Solution	2427 - Number of Common Factors.
Solution	2428 - Maximum Sum of an Hourglass.
Solution	2429 - Minimize XOR.
Solution	2430 - Maximum Deletions on a String.
Solution	2432 - The Employee That Worked on the Longest Task.
Solution	2433 - Find The Original Array of Prefix Xor.
Solution	2434 - Using a Robot to Print the Lexicographically Smallest String.
Solution	2435 - Paths in Matrix Whose Sum Is Divisible by K.
Solution	2437 - Number of Valid Clock Times.
Solution	2438 - Range Product Queries of Powers.
Solution	2439 - Minimize Maximum of Array.
Solution	2440 - Create Components With Same Value.
Solution	2441 - Largest Positive Integer That Exists With Its Negative.
Solution	2442 - Count Number of Distinct Integers After Reverse Operations.
Solution	2443 - Sum of Number and Its Reverse.
Solution	2444 - Count Subarrays With Fixed Bounds.
Solution	2446 - Determine if Two Events Have Conflict.
Solution	2447 - Number of Subarrays With GCD Equal to K.
Solution	2448 - Minimum Cost to Make Array Equal.
Solution	2449 - Minimum Number of Operations to Make Arrays Similar.
Solution	2451 - Odd String Difference.
Solution	2452 - Words Within Two Edits of Dictionary.
Solution	2453 - Destroy Sequential Targets.
Solution	2454 - Next Greater Element IV.
Solution	2455 - Average Value of Even Numbers That Are Divisible by Three.
Solution	2456 - Most Popular Video Creator.
Solution	2457 - Minimum Addition to Make Integer Beautiful.
Solution	2458 - Height of Binary Tree After Subtree Removal Queries.
Solution	2460 - Apply Operations to an Array.
Solution	2461 - Maximum Sum of Distinct Subarrays With Length K.
Solution	2462 - Total Cost to Hire K Workers.
Solution	2463 - Minimum Total Distance Traveled.
Solution	2465 - Number of Distinct Averages.
Solution	2466 - Count Ways To Build Good Strings.
Solution	2467 - Most Profitable Path in a Tree.
Solution	2468 - Split Message Based on Limit.
Solution	2469 - Convert the Temperature.
Solution	2470 - Number of Subarrays With LCM Equal to K.
Solution	2471 - Minimum Number of Operations to Sort a Binary Tree by Level.
Solution	2472 - Maximum Number of Non-overlapping Palindrome Substrings.
Solution	2475 - Number of Unequal Triplets in Array.
Solution	2476 - Closest Nodes Queries in a Binary Search Tree.
Solution	2477 - Minimum Fuel Cost to Report to the Capital.
Solution	2478 - Number of Beautiful Partitions.
Solution	2481 - Minimum Cuts to Divide a Circle.
Solution	2482 - Difference Between Ones and Zeros in Row and Column.
Solution	2483 - Minimum Penalty for a Shop.
Solution	2484 - Count Palindromic Subsequences.
Solution	2485 - Find the Pivot Integer.
Solution	2486 - Append Characters to String to Make Subsequence.
Solution	2487 - Remove Nodes From Linked List.
Solution	2488 - Count Subarrays With Median K.
Solution	2490 - Circular Sentence.
Solution	2491 - Divide Players Into Teams of Equal Skill.
Solution	2492 - Minimum Score of a Path Between Two Cities.
Solution	2493 - Divide Nodes Into the Maximum Number of Groups.
Solution	2496 - Maximum Value of a String in an Array.
Solution	2497 - Maximum Star Sum of a Graph.
Solution	2498 - Frog Jump II.
Solution	2499 - Minimum Total Cost to Make Arrays Unequal.
Solution	2500 - Delete Greatest Value in Each Row.
Solution	2501 - Longest Square Streak in an Array.
Solution	2503 - Maximum Number of Points From Grid Queries.
Solution	2506 - Count Pairs Of Similar Strings.
Solution	2507 - Smallest Value After Replacing With Sum of Prime Factors.
Solution	2508 - Add Edges to Make Degrees of All Nodes Even.
Solution	2509 - Cycle Length Queries in a Tree.
Solution	2511 - Maximum Enemy Forts That Can Be Captured.
Solution	2512 - Reward Top K Students.
Solution	2513 - Minimize the Maximum of Two Arrays.
Solution	2514 - Count Anagrams.
Solution	2515 - Shortest Distance to Target String in a Circular Array.
Solution	2516 - Take K of Each Character From Left and Right.
Solution.CustomFunction
SORTracker	2102 - Sequentially Ordinal Rank Tracker.
StockPrice	2034 - Stock Price Fluctuation.
StockSpanner	901 - Online Stock Span.
StreamChecker	1032 - Stream of Characters.
SubrectangleQueries	1476 - Subrectangle Queries.
SummaryRanges	352 - Data Stream as Disjoint Intervals.
TextEditor	2296 - Design a Text Editor.
ThroneInheritance	1600 - Throne Inheritance.
TimeMap	981 - Time Based Key-Value Store.
TopVotedCandidate	911 - Online Election.
Tree	212 - Word Search II.
TreeAncestor	1483 - Kth Ancestor of a Tree Node.
TreeNode
Trie	208 - Implement Trie (Prefix Tree).
TweetCounts	1348 - Tweet Counts Per Frequency.
Twitter	355 - Design Twitter.
UndergroundSystem	1396 - Design Underground System.
VersionControl	278 - First Bad Version.
WordDictionary	211 - Design Add and Search Words Data Structure.
WordFilter	745 - Prefix and Suffix Search.
ZeroEvenOdd	1116 - Print Zero Even Odd.