├── .github ├── ISSUE_TEMPLATE │ ├── bug_report.md │ └── feature_request.md ├── pull_request_template.md └── workflows │ └── format.yml ├── .gitignore ├── .vscode └── settings.json ├── AlgoExSolutions ├── Easy │ ├── BinarySearch │ │ └── Program.java │ ├── BranchSums │ │ └── Program.java │ ├── BubbleSort │ │ └── Program.java │ ├── CaesarCipherEncryptor │ │ └── Program.java │ ├── ClassPhotos │ │ └── Program.java │ ├── DepthFirstSearch │ │ └── Program.java │ ├── FindClosestValueInBST │ │ └── Program.java │ ├── FindThreeLargestNumbers │ │ └── Program.java │ ├── FirstNonRepeatingCharacter │ │ └── Program.java │ ├── GenerateDocument │ │ └── Program.java │ ├── InsertionSort │ │ └── Program.java │ ├── MinimumWaitingTime │ │ └── Program.java │ ├── NodeDepths │ │ └── Program.java │ ├── NonConstructibleChange │ │ └── Program.java │ ├── NthFibonacci │ │ └── Program.java │ ├── PalindromeCheck │ │ └── Program.java │ ├── ProductSum │ │ └── Program.java │ ├── RemoveDuplicatesFromLinkedList │ │ └── Program.java │ ├── RunLengthEncoding │ │ └── Program.java │ ├── SelectionSort │ │ └── Program.java │ ├── SortedSquaredArray │ │ └── Program.java │ ├── TandemBicycle │ │ └── Program.java │ ├── TournamentWinner │ │ └── Program.java │ ├── TwoNumberSum │ │ └── Program.java │ └── ValidateSubSequence │ │ └── Program.java ├── Hard │ ├── AmbiguousMeasurements │ │ └── Program.java │ ├── BoggleBoard │ │ └── Program.java │ ├── ContinuousMedian │ │ └── Program.java │ ├── DijkstrasAlgorithm │ │ └── Program.java │ ├── DiskStacking │ │ └── Program.java │ ├── FindLoop │ │ └── Program.java │ ├── FindNodesDistanceK │ │ └── Program.java │ ├── FourNumberSum │ │ └── Program.java │ ├── GenerateDivTags │ │ └── Program.java │ ├── HeapSort │ │ └── Program.java │ ├── IndexEqualsValue │ │ └── Program.java │ ├── InterweavingStrings │ │ └── Program.java │ ├── KnapsackProblem │ │ └── Program.java │ ├── LaptopRentals │ │ └── Program.java │ ├── LargestRange │ │ └── Program.java │ ├── LargestRectangleUnderSkyline │ │ └── Program.java │ ├── LongestCommonSubsequence │ │ └── Program.java │ ├── LongestSubstringWithoutDuplication │ │ └── Program.java │ ├── LowestCommonManager │ │ └── Program.java │ ├── MaxPathSumInBinaryTree │ │ └── Program.java │ ├── MaxSumIncreasingSubsequence │ │ └── Program.java │ ├── MaximizeExpression │ │ └── Program.java │ ├── MaximumSumSubmatrix │ │ └── Program.java │ ├── MergeLinkedList │ │ └── Program.java │ ├── MinNumberOfJumps │ │ └── Program.java │ ├── MinRewards │ │ └── Program.java │ ├── MultiStringSearch │ │ └── Program.java │ ├── NumbersInPi │ │ └── Program.java │ ├── PatternMatcher │ │ └── Program.java │ ├── QuickSort │ │ └── Program.java │ ├── Quickselect │ │ └── Program.java │ ├── RadixSort │ │ └── Program.java │ ├── ReverseLinkedList │ │ └── Program.java │ ├── SameBSTs │ │ └── Program.java │ ├── SearchForRange │ │ └── Program.java │ ├── ShiftLinkedList │ │ └── Program.java │ ├── ShiftedBinarySearch │ │ └── Program.java │ ├── ShortenPath │ │ └── Program.java │ ├── SolveSudoku │ │ └── Program.java │ ├── SortKSortedArray │ │ └── Program.java │ ├── SubarraySort │ │ └── Program.java │ ├── TopologicalSort │ │ └── Program.java │ ├── UnderscorifySubstring │ │ └── Program.java │ ├── ValidateThreeNodes │ │ └── Program.java │ ├── WaterArea │ │ └── Program.java │ └── ZigzagTraverse │ │ └── Program.java ├── Medium │ ├── ArrayofProducts │ │ └── Program.java │ ├── BSTConstruction │ │ └── Program.java │ ├── BSTTraversal │ │ └── Program.java │ ├── BalancedBrackets │ │ └── Program.java │ ├── BinaryTreeDiameter │ │ └── Program.java │ ├── BreadthFirstSearch │ │ └── Program.java │ ├── CycleInGraph │ │ └── Program.java │ ├── FindKthLargestValueInBST │ │ └── Program.java │ ├── FindSuccessor │ │ └── Program.java │ ├── FirstDuplicateValue │ │ └── Program.java │ ├── GroupAnagrams │ │ └── Program.java │ ├── HeightBalancedBinaryTree │ │ └── Program.java │ ├── InvertBinaryTree │ │ └── Program.java │ ├── KadanesAlgorithm │ │ └── Program.java │ ├── LevenshteinDistance │ │ └── Program.java │ ├── LinkedListConstruction │ │ └── Program.java │ ├── LongestPalindromicSubstring │ │ └── Program.java │ ├── LongestPeak │ │ └── Program.java │ ├── MaximumSubsetSumNoAdjacent │ │ └── Program.java │ ├── MergeOverlappingIntervals │ │ └── Program.java │ ├── MinHeapConstruction │ │ └── Program.java │ ├── MinHeightBST │ │ └── Program.java │ ├── MinMaxStackConstruction │ │ └── Program.java │ ├── MinNumberofCoinsForChange │ │ └── Program.java │ ├── MinimumCharactersForWords │ │ └── Program.java │ ├── MinimumPassesOfMatrix │ │ └── Program.java │ ├── MonotonicArray │ │ └── Program.java │ ├── MoveElementToEnd │ │ └── Program.java │ ├── NextGreaterElement │ │ └── Program.java │ ├── NumberofWaysToMakeChange │ │ └── Program.java │ ├── NumberofWaysToTraverseGraph │ │ └── Program.java │ ├── Permutations │ │ └── Program.java │ ├── PhoneNumberMnemonics │ │ └── Program.java │ ├── PowerSet │ │ └── Program.java │ ├── ReconstructBST │ │ └── Program.java │ ├── RemoveIslands │ │ └── Program.java │ ├── RemoveKthNodeFromTheEnd │ │ └── Program.java │ ├── ReverseWordsInAString │ │ └── Program.java │ ├── RiverSizes │ │ └── Program.java │ ├── SearchInSortedMatrix │ │ └── Program.java │ ├── SingleCycleCheck │ │ └── Program.java │ ├── SmallestDifference │ │ └── Program.java │ ├── SortStack │ │ └── Program.java │ ├── SpiralTraverse │ │ └── Program.java │ ├── StaircaseTraversal │ │ └── Program.java │ ├── SuffixTrieConstruction │ │ └── Program.java │ ├── SumofLinkedLists │ │ └── Program.java │ ├── SunsetViews │ │ └── Program.java │ ├── TaskAssignment │ │ └── Program.java │ ├── ThreeNumberSort │ │ └── Program.java │ ├── ThreeNumberSum │ │ └── Program.java │ ├── ValidIPAddresses │ │ └── Program.java │ ├── ValidStartingCity │ │ └── Program.java │ ├── ValidateBST │ │ └── Program.java │ └── YoungestCommonAncestor │ │ └── Program.java ├── README.md ├── VeryHard │ ├── AStarAlgorithm │ │ └── Program.java │ ├── AirportConnections │ │ └── Program.java │ ├── AllKindsOfNodeDepths │ │ └── Program.java │ ├── ApartmentHunting │ │ └── Program.java │ ├── CalendarMatching │ │ └── Program.java │ ├── CompareLeafTraversal │ │ └── Program.java │ ├── DetectArbitrage │ │ └── Program.java │ ├── FlattenBinaryTree │ │ └── Program.java │ ├── IterativeInorderTraversal │ │ └── Program.java │ ├── KnuthMorrisPrattAlgorithm │ │ └── Program.java │ ├── LRUCache │ │ └── Program.java │ ├── LineThroughPoints │ │ └── Program.java │ ├── LinkedListPalindrome │ │ └── Program.java │ ├── LongestBalancedSubstring │ │ └── Program.java │ ├── LongestIncreasingSubsequence │ │ └── Program.java │ ├── LongestStringChain │ │ └── Program.java │ ├── MaxProfitWithKTransactions │ │ └── Program.java │ ├── MergeSort │ │ └── Program.java │ ├── MergeSortedArrays │ │ └── Program.java │ ├── MinimumAreaRectangle │ │ └── Program.java │ ├── NodeSwap │ │ └── Program.java │ ├── NonAttackingQueens │ │ └── Program.java │ ├── NumberOfBinaryTreeTopologies │ │ └── Program.java │ ├── PalindromePartitioningMinCuts │ │ └── Program.java │ ├── RearrangeLinkedList │ │ └── Program.java │ ├── RectangleMania │ │ └── Program.java │ ├── RightSiblingTree │ │ └── Program.java │ ├── RightSmallerThan │ │ └── Program.java │ ├── SmallestSubstringContaining │ │ └── Program.java │ ├── SquareOfZeroes │ │ └── Program.java │ ├── TwoEdgeConnectedGraph │ │ └── Program.java │ ├── WaterfallStreams │ │ └── Program.java │ └── ZipLinkedList │ │ └── Program.java └── img │ └── algoexpert.png ├── Arrays ├── AnagramChecker │ ├── AnagramChecker.java │ └── AnagramCheckerTest.java ├── ArrayPairSum │ ├── ArrayPairSum.java │ └── ArrayPairSumTest.java ├── DynamicArray │ ├── DynamicArray.java │ └── DynamicArrayTest.java ├── FindMissingElement │ ├── FindMissingElement.java │ └── FindMissingElementTest.java ├── LargestContinuousSum │ ├── LargestContinuousSum.java │ └── LargestContinuousSumTest.java ├── SentenceReversal │ ├── SentenceReversal.java │ └── SentenceReversalTest.java ├── StringCompression │ ├── StringCompression.java │ └── StringCompressionTest.java └── UniqueCharacters │ ├── UniqueCharacters.java │ └── UniqueCharactersTest.java ├── CODE_OF_CONDUCT.md ├── CONTRIBUTING.md ├── DynamicProgramming ├── BuildingBridges │ └── Solution.java ├── CoinChangeProblem_I │ └── Solution.java ├── CoinChangeProblem_II │ └── Solution.java ├── CountOfSubsetSumsEqualToGivenSum │ └── Solution.java ├── CountOfSubsetsWithAGivenDifference │ └── Solution.java ├── EqualSumPartitionProblem │ └── Solution.java ├── KnapsackProblem │ └── Solution.java ├── LongestCommonSubsequence │ └── Solution.java ├── LongestCommonSubstring │ └── Solution.java ├── LongestIncreasingSubsequence │ └── Solution.java ├── LongestPalindromicSubsequence │ └── Solution.java ├── LongestRepeatingSubsequence │ └── Solution.java ├── MaximumLengthChainOfPairs │ └── Solution.java ├── MaximumSumIncreasingSubsequence │ └── Solution.java ├── MinimumNoOfInsertionsAndDeletions │ └── Solution.java ├── MinimumNumberOfDeletionsToMakeAStringPalindrome │ └── Solution.java ├── MinimumNumberOfInsertionsToMakeAStringPalindrome │ └── Solution.java ├── MinimumSubsetSumDifference │ └── Solution.java ├── RodCuttingProblem │ └── Solution.java ├── SequencePatternMatching │ └── Solution.java ├── ShortestCommonSupersequence │ └── Solution.java ├── SubsetSumProblem │ └── Solution.java ├── TargetSum │ └── Solution.java └── UnboundedKnapsackProblem │ └── Solution.java ├── Graphs ├── AdjacencyListImpl │ ├── Graph.java │ └── GraphTest.java ├── BFS │ ├── Graph.java │ └── GraphTest.java └── DFS │ ├── Graph.java │ └── GraphTest.java ├── LICENSE ├── LeetCode ├── Easy │ ├── AddBinary │ │ └── Solution.java │ ├── BalancedBinaryTree │ │ └── Solution.java │ ├── BestTimeToBuyAndSellStock │ │ └── Solution.java │ ├── BestTimeToBuyAndSellStock_II │ │ └── Solution.java │ ├── BinaryTreeTraversal_II │ │ └── Solution.java │ ├── ClimbingStairs │ │ └── Solution.java │ ├── ContainsDuplicate │ │ └── Solution.java │ ├── ContainsDuplicate_II │ │ └── Solution.java │ ├── CountAndSay │ │ └── Solution.java │ ├── CountPrimes │ │ └── Solution.java │ ├── ExcelSheetColumnNumber │ │ └── Solution.java │ ├── ExcelSheetColumnTitle │ │ └── Solution.java │ ├── FactorialTrailingZeroes │ │ └── Solution.java │ ├── HappyNumber │ │ └── Solution.java │ ├── ImplementQueueUsingStacks │ │ └── Solution.java │ ├── ImplementStackUsingQueues │ │ └── Solution.java │ ├── IntersectionofTwoLinkedLists │ │ └── Solution.java │ ├── InvertBinaryTree │ │ └── Solution.java │ ├── IsomorphicStrings │ │ └── Solution.java │ ├── LongestCommonPrefix │ │ └── Solution.java │ ├── LowestCommonAncestorofABST │ │ └── Solution.java │ ├── MajorityElement │ │ └── Solution.java │ ├── MaximumDepthofBinaryTree │ │ └── Solution.java │ ├── MaximumSubarray │ │ └── Solution.java │ ├── MergeSortedArray │ │ └── Solution.java │ ├── MergeTwoSortedLists │ │ └── Solution.java │ ├── MinStack │ │ ├── MinStack.java │ │ └── Solution.java │ ├── MinimumDepthofBinaryTree │ │ └── Solution.java │ ├── NumberOf1Bits │ │ └── Solution.java │ ├── PalindromeLinkedList │ │ └── Solution.java │ ├── PascalTriangle │ │ └── Solution.java │ ├── PascalTriangle_II │ │ └── Solution.java │ ├── PathSum │ │ └── Solution.java │ ├── PlusOne │ │ └── Solution.java │ ├── PowerofTwo │ │ └── Solution.java │ ├── RemoveDuplicates │ │ └── Solution.java │ ├── RemoveDuplicatesFromSortedList │ │ └── Solution.java │ ├── RemoveElement │ │ └── Solution.java │ ├── RemoveLinkedListElements │ │ └── Solution.java │ ├── ReverseBits │ │ └── Solution.java │ ├── ReverseInteger │ │ └── Solution.java │ ├── ReverseLinkedList │ │ └── Solution.java │ ├── RomanToInteger │ │ └── Solution.java │ ├── SameTree │ │ └── Solution.java │ ├── SearchInsertPosition │ │ └── Solution.java │ ├── SortedArrayToBST │ │ └── Solution.java │ ├── SummaryRanges │ │ └── Solution.java │ ├── SymmetricTree │ │ └── Solution.java │ ├── TwoSum │ │ └── Solution.java │ ├── TwoSum_II │ │ └── Solution.java │ ├── ValidAnagram │ │ └── Solution.java │ ├── ValidPalindrome │ │ └── Solution.java │ └── strStr │ │ └── Solution.java ├── Medium │ ├── AddTwoNumbers │ │ └── Solution.java │ ├── CombinationSum │ │ └── Solution.java │ ├── CombinationSum_II │ │ └── Solution.java │ ├── ContainerWithMostWater │ │ └── Solution.java │ ├── DivideTwoIntegers │ │ └── Solution.java │ ├── FirstAndLastPositionOfElementInSortedArray │ │ └── Solution.java │ ├── FourSum │ │ └── Solution.java │ ├── GenerateParenthesis │ │ └── Solution.java │ ├── GroupAnagrams │ │ └── Solution.java │ ├── IntToRoman │ │ └── Solution.java │ ├── JumpGame │ │ └── Solution.java │ ├── LetterCombinationsOfAPhoneNumber │ │ └── Solution.java │ ├── LongestPalindromicSubstring │ │ └── Solution.java │ ├── LongestSubstringWithoutRepeatingCharacters │ │ └── Solution.java │ ├── MultiplyStrings │ │ └── Solution.java │ ├── NextPermutation │ │ └── Solution.java │ ├── Permutations │ │ └── Solution.java │ ├── Permutations_II │ │ └── Solution.java │ ├── Pow_X_N │ │ └── Solution.java │ ├── RemoveNthNodeFromEndOfList │ │ └── Solution.java │ ├── RotateImage │ │ └── Solution.java │ ├── SearchInRotatedSortedArray │ │ └── Solution.java │ ├── SpiralMatrix │ │ └── Solution.java │ ├── StringToInteger │ │ └── Solution.java │ ├── SwapNodesInPairs │ │ └── Solution.java │ ├── ThreeSum │ │ └── Solution.java │ ├── ThreeSumClosest │ │ └── Solution.java │ ├── ValidSudoku │ │ └── Solution.java │ └── ZigZagConversion │ │ └── Solution.java ├── README.md └── img │ └── leetcode.png ├── LinkedLists ├── CycleChecker │ ├── CycleChecker.java │ ├── CycleCheckerTest.java │ └── Node.java ├── DoublyLinkedList │ ├── Node.java │ └── NodeTest.java ├── NthToLast │ ├── Node.java │ ├── NthToLast.java │ └── NthToLastTest.java ├── Reverser │ ├── Node.java │ ├── Reverser.java │ └── ReverserTest.java └── SinglyLinkedList │ ├── Node.java │ └── NodeTest.java ├── README.md ├── Recursion ├── CoinChange_I │ ├── CoinChange.java │ └── CoinChangeTest.java ├── CoinChange_II │ ├── CoinChange.java │ └── CoinChangeTest.java ├── DeleteMiddleElementofAStack │ └── Solution.java ├── Factorial │ ├── Factorial.java │ └── FactorialTest.java ├── Fibonacci │ ├── Fibonacci.java │ └── FibonacciTest.java ├── GenerateBalancedParentheses │ └── Solution.java ├── JosephusProblem │ └── Solution.java ├── KthSymbolInGrammar │ └── Solution.java ├── LetterCasePermutation │ └── Solution.java ├── NBitBinaryNumberHavingMore1sThan0s │ └── Solution.java ├── Permutation │ ├── Permutation.java │ └── PermutationTest.java ├── PermutationWithCaseChange │ └── Solution.java ├── PermutationWithSpaces │ └── Solution.java ├── PowerSetofAString │ └── Solution.java ├── ReverseAStack │ └── Solution.java ├── SortArray │ └── Solution.java ├── SortStack │ └── Solution.java ├── SplitPhrase │ ├── SplitPhrase.java │ └── SplitPhraseTest.java ├── StringReverser │ ├── Reverser.java │ └── ReverserTest.java ├── TowerofHanoi │ └── Solution.java └── UniqueSubsetsofAString │ └── Solution.java ├── Searching ├── BinarySearch │ ├── BinarySearch.java │ └── BinarySearchTest.java └── HashingImpl │ ├── HashTable.java │ └── HashTableTest.java ├── Sorting ├── BubbleSort │ ├── Bubble.java │ └── BubbleTest.java ├── HeapSort │ ├── Heap.java │ └── HeapTest.java ├── InsertionSort │ ├── Insertion.java │ └── InsertionTest.java ├── MergeSort │ ├── Merge.java │ └── MergeTest.java ├── QuickSort │ ├── Quick.java │ └── QuickTest.java ├── SelectionSort │ ├── Selection.java │ └── SelectionTest.java └── ShellSort │ ├── Shell.java │ └── ShellTest.java ├── StacksAndQueues ├── BalancedParenthesesCheck │ ├── BalancedParenthesesCheck.java │ └── BalancedParenthesesCheckTest.java ├── Deque │ ├── Deque.java │ └── DequeTest.java ├── Queue │ ├── Queue.java │ └── QueueTest.java ├── QueueWithTwoStacks │ ├── QueueWithTwoStacks.java │ └── QueueWithTwoStacksTest.java └── Stack │ ├── Stack.java │ └── StackTest.java └── Trees ├── BST ├── BinarySearchTree.java └── BinarySearchTreeTest.java ├── BSTChecker ├── BSTChecker.java └── BSTCheckerTest.java ├── LevelOrderTraversal ├── Traverser.java └── TraverserTest.java ├── 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