1 TwoSum solution 2 AddTwoNumbers solution 3 LongestSubstringWithoutRepeatingCharacters solution 7 ReverseInteger solution 8 StringToInteger solution 9 PalindromeNumber solution 12 IntegerToRoman solution 13 RomanToInteger solution 14 LongestCommonPrefix solution 15 3Sum solution 19 RemoveNthNodeFromEndOfList solution 20 ValidParentheses solution solution 21 MergeTwoSortedLists solution solution 24 SwapNodesInPairs solution 26 RemoveDuplicatesFromSortedArray solution solution 27 RemoveElement solution solution 28 ImplementStrStr solution 31 NextPermutation solution solution 33 SearchInRotatedSortedArray solution 34 FindFirstAndLastPositionOfElementInSortedArray solution 35 SearchInsertPosition solution 36 ValidSudoku solution 38 CountAndSay solution 45 JumpGameII solution 46 Permutation solution 47 PermutationsII solution 49 GroupAnagrams solution 50 Powxn solution 53 MaximumSubarray solution 54 SpiralMatrix solution 55 JumpGame solution 56 MergeIntervals solution 58 LengthOfLastWord solution 59 SpiralMatrixII solution 60 PermutationSequence solution 61 RotateList solution 62 UniquePaths solution 64 MinimumPathSum solution 66 PlusOne solution 67 AddBinary solution 69 Sqrtx solution 70 ClimbingStairs solution 72 EditDistance solution 74 SearchA2dMatrix solution solution 75 SortColors solution 78 Subsets solution 79 WordSearch solution 80 RemoveDuplicatesFromSortedArrayII solution 83 RemoveDuplicatesFromSortedList solution 88 MergeSortedArray solution solution 94 BinaryTreeInorderTraversal solution 96 UniqueBinarySearchTrees solution 98 ValidateBinarySearchTree solution 100 SameTree solution 101 SymmetricTree solution 102 BinaryTreeLevelOrderTraversal solution 103 BinaryTreeZigzagLevelOrderTraversal solution 104 MaximumDepthOfBinaryTree solution 106 ConstructBinaryTreeFromInorderAndPostorderTraversal solution 107 BinaryTreeLevelOrderTraversalII solution 108 ConvertSortedArrayToBinarySearchTree solution 111 MinimumDepthOfBinaryTree solution 112 PathSum solution 116 PopulatingNextRightPointersInEachNode solution 118 PascalsTriangle solution 119 PascalsTriangleII solution 121 BestTimeToBuyAndSellStock solution 122 BestTimeToBuyAndSellStockII solution 123 BestTimeToBuyAndSellStockIII solution 124 BinaryTreeMaximumPathSum solution 125 ValidPalindrome solution 129 SumRootToLeafNumbers solution 130 SurroundedRegions solution 133 CloneGraph solution 136 SingleNumber solution 137 SingleNumberII solution 138 CopyListWithRandomPointer solution 140 WordBreakII solution 141 LinkedListCycle solution 142 LinkedListCycleII solution 143 ReorderList solution 146 LRUCache solution 150 EvaluateReversePolishNotation solution 151 ReverseWordsInAString solution 153 FindMinimumInRotatedSortedArray solution 154 FindMinimumInRotatedSortedArrayII solution 155 MinStack solution solution 160 IntersectionOfTwoLinkedLists solution 162 FindPeakElement solution 167 TwoSumII solution 169 MajorityElement solution 171 ExcelSheetColumnNumber solution 172 FactorialTrailingZeroes solution 174 DungeonGame solution 187 RepeatedDNASequences solution 189 RotateArray solution 190 ReverseBits solution 191 NumberOf1Bits solution solution 198 HouseRobber solution 200 NumberOfIslands solution 201 BitwiseANDOfNumbersRange solution 202 HappyNumber solution 203 RemoveLinkedListElements solution 204 CountPrimes solution 205 IsomorphicStrings solution 206 ReverseLinkedList solution 207 CourseSchedule solution 208 ImplementTriePrefixTree solution 209 MinimumSizeSubarraySum solution 210 CourseScheduleII solution 211 AddAndSearchWord_DataStructureDesign solution 212 WordSearchII solution 215 KthLargestElementInAnArray solution 217 ContainsDuplicate solution 219 ContainsDuplicateII solution 221 MaximalSquare solution 222 CountCompleteTreeNodes solution 225 ImplementStackUsingQueues solution 226 InvertBinaryTree solution 230 KthSmallestElementInABST solution 231 PowerOfTwo solution 232 ImplementQueueUsingStacks solution 234 PalindromeLinkedList solution solution 237 DeleteNodeInALinkedList solution 238 ProductOfArrayExceptSelf solution 242 ValidAnagram solution 257 BinaryTreePaths solution 258 AddDigits solution 260 SingleNumberIII solution 264 UglyNumberII solution 268 MissingNumber solution 274 HIndex solution 275 HIndexII solution 278 FirstBadVersion solution solution 279 PerfectSquares solution 283 MoveZeroes solution solution 287 FindTheDuplicateNumber solution 289 GameOfLife solution solution 292 NimGame solution 300 LongestIncreasingSubsequence solution 303 RangeSumQueryImmutable solution 309 BestTimeToBuyAndSellStockWithCooldown solution 322 CoinChange solution 326 PowerOfThree solution 328 OddEvenLinkedList solution 332 ReconstructItinerary solution 338 CountingBits solution 342 PowerOfFour solution 344 ReverseString solution solution 345 ReverseVowelsOfAString solution 347 TopKFrequentElements solution solution 349 IntersectionOfTwoArrays solution 350 IntersectionOfTwoArraysIi solution solution 357 ComplexNumberMultiplication solution 367 ValidPerfectSquare solution 368 LargestDivisibleSubset solution 371 SumOfTwoIntegers solution 374 GuessNumberHigherOrLower solution 380 InsertDeleteGetRandomO1 solution 382 LinkedListRandomNode solution 383 RansomNote solution solution 384 ShuffleAnArray solution 387 FirstUniqueCharacterInAString solution solution 389 FindTheDifference solution 392 IsSubsequence solution 394 DecodeString solution 402 RemoveKDigits solution 406 QueueReconstructionByHeight solution 409 LongestPalindrome solution 412 FizzBuzz solution solution 414 ThirdMaximumNumber solution 430 FlattenAMultilevelDoublyLinkedList solution 434 NumberOfSegmentsInAString solution 435 NonOverlappingIntervals solution 437 PathSumIII solution 438 FindAllAnagramsInAString solution 441 ArrangingCoins solution 442 FindAllDuplicatesInAnArray solution 443 StringCompression solution 445 AddTwoNumbersII solution 448 FindAllNumbersDisappearedInAnArray solution solution 451 SortCharactersByFrequency solution 453 MinimumMovesToEqualArrayElements solution 454 4SumII solution 456 132Pattern solution 461 HammingDistance solution 463 IslandPerimeter solution 468 ValidateIPAddress solution 476 NumberComplement solution 485 MaxConsecutiveOnes solution solution 494 TargetSum solution 496 NextGreaterElementI solution 497 RandomPointInNonOverlappingRectangles solution 498 DiagonalTraverse solution 509 FibonacciNumber solution 518 CoinChange2 solution 520 DetectCapital solution 521 LongestUncommonSubsequenceI solution 525 ContiguousArray solution 526 BeautifulArrangement solution 528 RandomPickWithWeight solution 535 EncodeAndDecodeTinyURL solution 538 ConvertBSTToGreaterTree solution 540 SingleElementInASortedArray solution 541 ReverseStringII solution 542 01Matrix solution 543 DiameterOfBinaryTree solution 551 StudentAttendanceRecordI solution 557 ReverseWordsInAStringIII solution 559 MaximumDepthOfNAryTree solution 560 SubarraySumEqualsK solution 561 ArrayPartitionI solution 563 BinaryTreeTilt solution 566 ReshapeTheMatrix solution 567 PermutationInString solution 572 SubtreeOfAnotherTree solution 575 DistributeCandies solution 581 ShortestUnsortedContinuousSubarray solution 589 NAryTreePreorderTraversal solution 590 NAryTreePostorderTraversal solution 598 RangeAdditionII solution 599 MinimumIndexSumOfTwoLists solution 605 CanPlaceFlowers solution 606 ConstructStringFromBinaryTree solution 617 MergeTwoBinaryTrees solution 621 TaskScheduler solution 622 DesignCircularQueue solution 628 MaximumProductOfThreeNumbers solution 633 SumOfSquareNumbers solution 637 AverageOfLevelsInBinaryTree solution 643 MaximumAverageSubarrayI solution 645 SetMismatch solution 652 FindDuplicateSubtrees solution 653 TwoSumIV solution 657 RobotReturnToOrigin solution 658 FindKClosestElements solution 661 ImageSmoother solution 662 MaximumWidthOfBinaryTree solution 665 NonDecreasingArray solution 669 TrimABinarySearchTree solution 673 NumberOfLongestIncreasingSubsequence solution 674 LongestContinuousIncreasingSubsequence solution 678 ValidParenthesisString solution 682 BaseballGame solution 686 RepeatedStringMatch solution 690 EmployeeImportance solution 693 BinaryNumberWithAlternatingBits solution 695 MaxAreaofIsland solution 696 CountBinarySubstrings solution 697 DegreeOfAnArray solution 700 SearchInABinarySearchTree solution 703 KthLargestElementInAStream solution 704 BinarySearch solution solution 705 DesignHashSet solution 706 DesignHashMap solution 707 DesignLinkedList solution solution 709 ToLowerCase solution 717 1BitAnd2BitCharacters solution 720 LongestWordInDictionary solution 724 FindPivotIndex solution 728 SelfDividingNumbers solution 733 FloodFill solution 735 AsteroidCollision solution 739 DailyTemperatures solution 744 FindSmallestLetterGreaterThanTarget solution 746 MinCostClimbingStairs solution 747 LargestNumberAtLeastTwiceOfOthers solution 748 ShortestCompletingWord solution 752 OpenTheLock solution 762 PrimeNumberOfSetBitsInBinaryRepresentation solution 763 PartitionLabels solution 766 ToeplitzMatrix solution 771 JewelsAndStones solution 783 MinimumDistanceBetweenBSTNodes solution 784 LetterCasePermutation solution 787 CheapestFlightsWithinKStops solution 788 RotatedDigits solution 791 CustomSortString solution 796 RotateString solution 797 AllPathsFromSourceToTarget solution 804 UniqueMorseCodeWords solution 806 NumberOfLinesToWriteString solution 807 MaxIncreaseToKeepCitySkyline solution 811 SubdomainVisitCount solution 812 LargestTriangleArea solution 813 LargestSumOfAverages solution 819 MostCommonWord solution 821 ShortestDistanceToACharacter solution 824 GoatLatin solution 830 PositionsOfLargeGroups solution 832 FlippingAnImage solution 836 RectangleOverlap solution 840 MagicSquaresInGrid solution 841 KeysAndRooms solution 844 BackspaceStringCompare solution 849 MaximizeDistanceToClosestPerson solution 852 PeakIndexInAMountainArray solution 860 LemonadeChange solution 865 SmallestSubtreeWithAllTheDeepestNodes solution 867 TransposeMatrix solution 868 BinaryGap solution 872 LeafSimilarTrees solution 876 MiddleOfTheLinkedList solution solution 881 BoatsToSavePeople solution 883 ProjectionAreaOf3DShapes solution 884 UncommonWordsFromTwoSentences solution 886 PossibleBipartition solution 888 FairCandySwap solution 890 FindAndReplacePattern solution 892 SurfaceAreaOf3DShapes solution 893 GroupsOfSpecialEquivalentStrings solution 896 MonotonicArray solution 897 IncreasingOrderSearchTree solution 901 OnlineStockSpan solution 905 SortArrayByParity solution solution 908 SmallestRangeI solution 912 SortAnArray solution 917 ReverseOnlyLetters solution 918 MaximumSumCircularSubarray solution 921 MinimumAddToMakeParenthesesValid solution 922 SortArrayByParityII solution 925 LongPressedName solution 929 UniqueEmailAddresses solution 933 NumberOfRecentCalls solution 937 ReorderDataInLogFiles solution 938 RangeSumOfBST solution 941 ValidMountainArray solution solution 942 DIStringMatch solution 944 DeleteColumnsToMakeSorted solution 946 ValidateStackSequences solution 948 BagOfTokens solution 949 LargestTimeForGivenDigits solution 953 VerifyingAnAlienDictionary solution 957 PrisonCellsAfterNDays solution 961 NRepeatedElementInSize2NArray solution 965 UnivaluedBinaryTree solution 967 NumbersWithSameConsecutiveDifferences solution 970 PowerfulIntegers solution 973 KClosestPointsToOrigin solution 976 LargestPerimeterTriangle solution 977 SquaresOfASortedArray solution solution 985 SumOfEvenNumbersAfterQueries solution 986 IntervalListIntersections solution 987 VerticalOrderTraversalOfABinaryTree solution 989 AddToArrayFormOfInteger solution 991 BrokenCalculator solution 993 CousinsInBinaryTree solution 994 RottingOranges solution 997 FindTheTownJudge solution 1002 FindCommonCharacters solution 1007 MinimumDominoRotationsForEqualRow solution 1008 ConstructBinarySearchTreeFromPreorderTraversal solution 1009 ComplementOfBase10Integer solution 1010 PairsOfSongsWithTotalDurationsDivisibleBy60 solution 1021 RemoveOutermostParentheses solution 1026 MaximumDifferenceBetweenNodeAndAncestor solution 1029 TwoCityScheduling solution 1030 MatrixCellsInDistanceOrder solution 1035 UncrossedLines solution 1044 LongestDuplicateSubstring solution 1046 LastStoneWeight solution 1047 RemoveAllAdjacentDuplicatesInString solution 1051 HeightChecker solution solution 1071 GreatestCommonDivisorOfStrings solution 1089 DuplicateZeros solution solution 1091 ShortestPathInBinaryMatrix solution 1103 DistributeCandiesToPeople solution 1108 DefangingAnIPAddress solution 1122 RelativeSortArray solution 1137 NthTribonacciNumber solution 1143 LongestCommonSubsequence solution solution 1160 FindWordsThatCanBeFormedByCharacters solution 1189 MaximumNumberOfBalloons solution 1207 UniqueNumberOfOccurrences solution 1217 MinimumCostToMoveChipsToTheSamePosition solution 1221 SplitAStringInBalancedStrings solution 1227 CountSquareSubmatricesWithAllOnes solution 1232 CheckIfItIsAStraightLine solution 1254 NumberOfClosedIslands solution 1260 Shift2dGrid solution solution 1266 MinimumTimeVisitingAllPoints solution 1281 SubtractTheProductAndSumOfDigitsOfAnInteger solution solution 1282 GroupThePeopleGivenTheGroupSizeTheyBelongTo solution 1283 FindTheSmallestDivisorGivenAThreshold solution 1286 IteratorForCombination solution 1290 ConvertBinaryNumberInALinkedListToInteger solution 1295 FindNumbersWithEvenNumberOfDigits solution solution 1299 ReplaceElementsWithGreatestElementOnRightSide solution 1302 DeepestLeavesSum solution 1304 FindNUniqueIntegersSumUpToZero solution 1306 JumpGameIII solution 1309 DecryptStringFromAlphabetToIntegerMapping solution 1314 MatrixBlockSum solution 1317 ConvertIntegerToTheSumOfTwoNoZeroIntegers solution 1323 Maximum69Number solution 1329 SortTheMatrixDiagonally solution 1332 RemovePalindromicSubsequences solution 1337 TheKWeakestRowsInAMatrix solution 1342 NumberOfStepsToReduceANumberToZero solution solution 1344 AngleBetweenHandsOfAClock solution 1346 CheckIfNAndItsDoubleExist solution 1347 MinimumNumberOfStepsToMakeTwoStringsAnagram solution 1351 CountNegativeNumbersInASortedMatrix solution 1356 SortIntegersByTheNumberOf1Bits solution 1365 HowManyNumbersAreSmallerThanTheCurrentNumber solution 1370 IncreasingDecreasingString solution 1374 GenerateAStringWithCharactersThatHaveOddCounts solution 1379 FindACorrespondingNodeOfABinaryTreeInACloneOfThatTree solution 1380 LuckyNumbersInAMatrix solution 1387 SortIntegersByThePowerValue solution 1389 CreateTargetArrayInTheGivenOrder solution 1394 FindLuckyIntegerInAnArray solution 1400 ConstructKPalindromeStrings solution 1403 MinimumSubsequenceInNonIncreasingOrder solution 1408 StringMatchingInAnArray solution 1417 ReformatTheString solution 1431 KidsWithTheGreatestNumberOfCandies solution 1437 CheckIfAll1sAreAtLeastLengthKPlacesAway solution 1446 ConsecutiveCharacters solution 1451 RearrangeWordsInASentence solution 1460 MakeTwoArraysEqualByReversingSubArrays solution 1461 CheckIfAStringContainsAllBinaryCodesOfSizeK solution 1464 MaximumProductOfTwoElementsInAnArray solution 1475 FinalPricesWithASpecialDiscountInAShop solution 1476 SubrectangleQueries solution 1480 RunningSumOf1dArray solution solution 1491 AverageSalaryExcludingTheMinimumAndMaximumSalary solution solution 1492 TheKthFactorOfN solution 1510 StoneGameIV solution 1512 NumberOfGoodPairs solution 1523 CountOddNumbersInAnIntervalRange solution solution 1525 NumberOfGoodWaysToSplitAString solution 1539 KthMissingPositiveNumber solution 1550 ThreeConsecutiveOdds solution 1556 ThousandSeparator solution 1561 MaximumNumberOfCoinsYouCanGet solution 1572 MatrixDiagonalSum solution 1582 SpecialPositionsInABinaryMatrix solution 1588 SumOfAllOddLengthSubarrays solution 1605 FindValidMatrixGivenRowAndColumnSums solution 1624 LargestSubstringBetweenTwoEqualCharacters solution 1640 CheckArrayFormationThroughConcatenation solution 1646 GetMaximumInGeneratedArray solution 1657 DetermineIfTwoStringsAreClose solution 1662 CheckIfTwoStringArraysAreEquivalent solution 1663 SmallestStringWithAGivenNumericValue solution 1669 MergeInBetweenLinkedLists solution 1672 RichestCustomerWealth solution solution 1684 CountTheNumberOfConsistentStrings solution 1694 ReformatPhoneNumber solution 1848 MinimumDistanceToTheTargetElement solution 1925 CountSquareSumTriples solution