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ClassicalQuestions.md

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├── Array
│   ├── bestTimeToBuyAndSellStock.java
│   ├── findTheCelebrity.java
│   ├── gameOfLife.java
│   ├── increasingTripletSubsequence.java
│   ├── insertInterval.java
│   ├── longestConsecutiveSequence.java
│   ├── maximumProductSubarray.java
│   ├── maximumSubarray.java
│   ├── mergeIntervals.java
│   ├── missingRanges.java
│   ├── productOfArrayExceptSelf.java
│   ├── rotateImage.java
│   ├── searchInRotatedSortedArray.java
│   ├── spiralMatrixII.java
│   ├── subsetsII.java
│   ├── subsets.java
│   ├── summaryRanges.java
│   ├── wiggleSort.java
│   └── wordSearch.java
├── Backtracking
│   ├── androidUnlockPatterns.java
│   ├── generalizedAbbreviation.java
│   └── letterCombinationsOfAPhoneNumber.java
├── BinarySearch
│   ├── closestBinarySearchTreeValue.java
│   ├── firstBadVersion.java
│   ├── guessNumberHigherOrLower.java
│   ├── pow(x,n).java
│   └── sqrt(x).java
├── BitManipulation
│   ├── binaryWatch.java
│   ├── countingBits.java
│   ├── hammingDistance.java
│   ├── maximumProductOfWordLengths.java
│   ├── numberOf1Bits.java
│   ├── sumOfTwoIntegers.java
│   └── utf-8Validation.java
├── BreadthFirstSearch
│   ├── binaryTreeLevelOrderTraversal.java
│   ├── cloneGraph.java
│   ├── pacificAtlanticWaterFlow.java
│   ├── removeInvalidParentheses.java
│   ├── shortestDistanceFromAllBuildings.java
│   ├── symmetricTree.java
│   └── wallsAndGates.java
├── DepthFirstSearch
│   ├── balancedBinaryTree.java
│   ├── battleshipsInABoard.java
│   ├── convertSortedArrayToBinarySearchTree.java
│   ├── maximumDepthOfABinaryTree.java
│   ├── numberOfIslands.java
│   ├── populatingNextRightPointersInEachNode.java
│   └── sameTree.java
├── Design
│   └── zigzagIterator.java
├── DivideAndConquer
│   ├── expressionAddOperators.java
│   └── kthLargestElementInAnArray.java
├── DynamicProgramming
│   ├── bombEnemy.java
│   ├── climbingStairs.java
│   ├── combinationSumIV.java
│   ├── countingBits.java
│   ├── editDistance.java
│   ├── houseRobber.java
│   ├── paintFence.java
│   ├── paintHouseII.java
│   ├── regularExpressionMatching.java
│   ├── sentenceScreenFitting.java
│   ├── uniqueBinarySearchTrees.java
│   └── wordBreak.java
├── HashTable
│   ├── binaryTreeVerticalOrderTraversal.java
│   ├── findTheDifference.java
│   ├── groupAnagrams.java
│   ├── groupShiftedStrings.java
│   ├── islandPerimeter.java
│   ├── loggerRateLimiter.java
│   ├── maximumSizeSubarraySumEqualsK.java
│   ├── minimumWindowSubstring.java
│   ├── sparseMatrixMultiplication.java
│   ├── strobogrammaticNumber.java
│   ├── twoSum.java
│   └── uniqueWordAbbreviation.java
├── LinkedList
│   ├── addTwoNumbers.java
│   ├── deleteNodeInALinkedList.java
│   ├── mergeKSortedLists.java
│   ├── palindromeLinkedList.java
│   ├── plusOneLinkedList.java
│   ├── README.md
│   └── reverseLinkedList.java
├── Queue
│   └── movingAverageFromDataStream.java
├── README.md
├── Sort
│   ├── meetingRoomsII.java
│   └── meetingRooms.java
├── Stack
│   ├── binarySearchTreeIterator.java
│   ├── decodeString.java
│   ├── flattenNestedListIterator.java
│   └── trappingRainWater.java
├── String
│   ├── addBinary.java
│   ├── countAndSay.java
│   ├── decodeWays.java
│   ├── editDistance.java
│   ├── integerToEnglishWords.java
│   ├── longestPalindrome.java
│   ├── longestSubstringWithAtMostKDistinctCharacters.java
│   ├── minimumWindowSubstring.java
│   ├── multiplyString.java
│   ├── oneEditDistance.java
│   ├── palindromePermutation.java
│   ├── reverseVowelsOfAString.java
│   ├── romanToInteger.java
│   ├── validPalindrome.java
│   └── validParentheses.java
├── Tree
│   ├── binaryTreeMaximumPathSum.java
│   ├── binaryTreePaths.java
│   ├── inorderSuccessorInBST.java
│   ├── invertBinaryTree.java
│   ├── lowestCommonAncestorOfABinaryTree.java
│   ├── sumOfLeftLeaves.java
│   └── validateBinarySearchTree.java
├── Trie
│   ├── addAndSearchWordDataStructureDesign.java
│   ├── implementTrie.java
│   └── wordSquares.java
└── TwoPointers
    ├── 3Sum.java
    ├── 3SumSmaller.java
    ├── mergeSortedArray.java
    ├── minimumSizeSubarraySum.java
    ├── moveZeros.java
    ├── removeDuplicatesFromSortedArray.java
    ├── reverseString.java
    └── sortColors.java