├── .gitignore ├── README.md ├── SwordToOffer ├── countDigitOne.java ├── countDigitOne.md ├── exist.java ├── exist.md ├── fib.java ├── fib.md ├── findNthDigit.java ├── findNthDigit.md ├── findNumberIn2DArray.java ├── findNumberIn2DArray.md ├── findRepeatNumber.java ├── findRepeatNumber.md ├── firstUniqChar.java ├── firstUniqChar.md ├── getIntersectionNode.java ├── getIntersectionNode.md ├── isStraight.java ├── isStraight.md ├── lowestCommonAncestor.java ├── lowestCommonAncestor.md ├── lowestCommonAncestor2.java ├── lowestCommonAncestor2.md ├── replaceSpace.java ├── replaceSpace.md ├── reverseLeftWords.java ├── reverseLeftWords.md ├── reversePrint.java └── reversePrint.md ├── WeekContest ├── CustomStack.java ├── CustomStack.md ├── UndergroundSystem.java ├── UndergroundSystem.md ├── balanceBST.java ├── balanceBST.md ├── buildArray.java ├── buildArray.md ├── countTriplets.java ├── countTriplets.md ├── createTargetArray.java ├── createTargetArray.md ├── destCity.java ├── destCity.md ├── displayTable.java ├── displayTable.md ├── entityParser.java ├── entityParser.md ├── findDiagonalOrder2.java ├── findDiagonalOrder2.md ├── findLucky.java ├── findLucky.md ├── frogPosition.java ├── frogPosition.md ├── generateTheString.java ├── generateTheString.md ├── getTriggerTime.java ├── getTriggerTime.md ├── kLengthApart.java ├── kLengthApart.md ├── longestSubarray.java ├── longestSubarray.md ├── luckyNumbers.java ├── luckyNumbers.md ├── maxScore.java ├── maxScore.md ├── maxScore2.java ├── maxScore2.md ├── minCount.java ├── minCount.md ├── minNumberOfFrogs.java ├── minNumberOfFrogs.md ├── minSubsequence.java ├── minSubsequence.md ├── minTime.java ├── minTime.md ├── numOfMinutes.java ├── numOfMinutes.md ├── numSteps.java ├── numSteps.md ├── numTeams.java ├── numTeams.md ├── numTimesAllBlue.java ├── numTimesAllBlue.md ├── numWays.java ├── numWays.md ├── processQueries.java ├── processQueries.md ├── reformat.java ├── reformat.md ├── stringMatching.java ├── stringMatching.md ├── sumFourDivisors.java └── sumFourDivisors.md ├── easy ├── ArrayAndMatrix │ ├── canThreePartsEqualSum.java │ ├── canThreePartsEqualSum.md │ ├── containsDuplicate.java │ ├── containsDuplicate.md │ ├── distributeCandies.java │ ├── distributeCandies.md │ ├── findErrorNums.java │ ├── findErrorNums645.md │ ├── findLHS.java │ ├── findLHS.jpg │ ├── findLHS.md │ ├── findMaxConsecutiveOnes.java │ ├── findMaxConsecutiveOnes485.md │ ├── findShortestSubArray.java │ ├── findShortestSubArray.md │ ├── hasGroupsSizeX.java │ ├── hasGroupsSizeX.md │ ├── isToeplitzMatrix.java │ ├── isToeplitzMatrix.md │ ├── matrixReshape.java │ ├── matrixReshape.md │ ├── merge88.java │ ├── merge88.md │ ├── moveZeroes.java │ ├── moveZeroes.md │ ├── removeDuplicates.java │ ├── removeDuplicates.md │ ├── removeDuplicates图示.png │ ├── removeElement.java │ ├── removeElement.md │ ├── rotate.java │ ├── rotate.md │ ├── surfaceArea.java │ ├── surfaceArea.md │ └── surfaceArea图示.png ├── BinarySearch │ ├── findTheDistanceValue.java │ ├── findTheDistanceValue.md │ ├── findTheDistanceValue图示.png │ ├── mySqrt.java │ ├── mySqrt.md │ ├── mySqrt图示.png │ ├── nextGreatestLetter.java │ ├── nextGreatestLetter.md │ ├── searchInsert.java │ ├── searchInsert.md │ └── searchInsert图示.png ├── BitOperation │ ├── findComplement.java │ ├── findComplement.md │ ├── getSum.java │ ├── getSum.md │ ├── hammingDistance.java │ ├── hammingDistance.md │ ├── hammingWeight.java │ ├── hammingWeight.md │ ├── hasAlternatingBits.java │ ├── hasAlternatingBits.md │ ├── isPowerOfFour.java │ ├── isPowerOfFour.md │ ├── isPowerOfTwo.java │ ├── isPowerOfTwo.md │ ├── missingNumber.java │ ├── missingNumber.md │ ├── reverseBits.java │ ├── reverseBits.md │ ├── singleNumber.java │ └── singleNumber.md ├── DP │ ├── climbStairs.java │ ├── climbStairs.md │ ├── massage.java │ ├── massage.md │ ├── maxSubArray.java │ ├── maxSubArray.md │ ├── rob198.java │ └── rob198.md ├── LinkedList │ ├── ListNode.java │ ├── deleteDuplicates.java │ ├── deleteDuplicates.jpg │ ├── deleteDuplicates.md │ ├── deleteNode.java │ ├── deleteNode.md │ ├── getIntersectionNode.java │ ├── getIntersectionNode.md │ ├── hasCycle.java │ ├── hasCycle.md │ ├── isPalindrome.java │ ├── isPalindrome.md │ ├── isPalindrome1.jpg │ ├── isPalindrome2.jpg │ ├── mergeTwoLists.java │ ├── mergeTwoLists.jpg │ ├── mergeTwoLists.md │ ├── middleNode.java │ ├── middleNode.jpg │ ├── middleNode.md │ ├── removeElements.java │ ├── removeElements.md │ ├── reverseList.java │ ├── reverseList.jpg │ └── reverseList.md ├── Sort │ ├── getLeastNumbers.java │ ├── getLeastNumbers.md │ ├── intersect350.java │ ├── intersect350.md │ ├── intersection349.java │ ├── intersection349.md │ ├── majorityElement.java │ └── majorityElement.md ├── StackAndQueue │ ├── MinStack155.java │ ├── MinStack155.md │ ├── MyQueue232.java │ ├── MyQueue232.jpg │ ├── MyQueue232.md │ ├── MyStack225.1.jpg │ ├── MyStack225.2.jpg │ ├── MyStack225.java │ ├── MyStack225.md │ ├── getLeastNumbers.java │ ├── getLeastNumbers.md │ ├── isValid20.java │ └── isValid20.md ├── String │ ├── canConstruct.java │ ├── canConstruct.md │ ├── compressString.java │ ├── compressString.md │ ├── countBinarySubstrings.java │ ├── countBinarySubstrings.md │ ├── countCharacters.java │ ├── countCharacters.md │ ├── gcdOfStrings.java │ ├── gcdOfStrings.md │ ├── isAnagram.java │ ├── isAnagram.md │ ├── isIsomorphic.java │ ├── isIsomorphic.md │ ├── isPalindrome.java │ ├── isPalindrome.md │ ├── lengthOfLastWord.java │ ├── lengthOfLastWord.md │ ├── longestPalindrome.java │ ├── longestPalindrome.md │ ├── sortString.java │ └── sortString.md ├── Tree │ ├── averageOfLevels.java │ ├── averageOfLevels.md │ ├── binaryTreePaths.java │ ├── binaryTreePaths.md │ ├── convertBST.java │ ├── convertBST.md │ ├── diameterOfBinaryTree543.java │ ├── diameterOfBinaryTree543.md │ ├── findMode.java │ ├── findMode.md │ ├── findSecondMinimumValue.java │ ├── findSecondMinimumValue.md │ ├── findTarget.java │ ├── findTarget.md │ ├── hasPathSum112.java │ ├── hasPathSum112.md │ ├── invertTree.java │ ├── invertTree.md │ ├── isBalanced110.java │ ├── isBalanced110.md │ ├── isSameTree100.java │ ├── isSameTree100.md │ ├── isSubtree.java │ ├── isSubtree.md │ ├── isSymmetric.java │ ├── isSymmetric.md │ ├── longestUnivaluePath.java │ ├── longestUnivaluePath.md │ ├── lowestCommonAncestor.java │ ├── lowestCommonAncestor.md │ ├── maxDepth106.java │ ├── maxDepth106.md │ ├── mergeTrees.java │ ├── mergeTrees.md │ ├── minDepth.java │ ├── minDepth.md │ ├── pathSum437.java │ ├── pathSum437.md │ ├── sortedArrayToBST.java │ ├── sortedArrayToBST.md │ ├── sumOfLeftLeaves404.java │ ├── sumOfLeftLeaves404.md │ ├── trimBST.java │ └── trimBST.md ├── TwoPoint │ ├── findContinuousSequence.java │ ├── findContinuousSequence.md │ ├── isHappy.java │ ├── isHappy.md │ ├── reverseVowels.java │ ├── reverseVowels.md │ ├── twoSum167.java │ ├── twoSum167.md │ ├── validPalindrome.java │ └── validPalindrome.md └── other │ ├── TwoSum.java │ ├── TwoSum.md │ ├── isRectangleOverlap.java │ ├── isRectangleOverlap.md │ ├── isRectangleOverlap图示.png │ ├── judgeSquareSum633.java │ ├── judgeSquareSum633.md │ ├── numRookCaptures.java │ ├── numRookCaptures.md │ ├── orangesRotting.java │ └── orangesRotting.md ├── hard └── Greedy │ ├── jump.java │ ├── jump.md │ └── jump图示.png └── medium ├── ArrayAndMatrix ├── arrayNesting.java ├── arrayNesting565.md ├── checkSubarraySum.java ├── checkSubarraySum.md ├── constructArray.java ├── constructArray.md ├── kthSmallest.java ├── kthSmallest.md ├── kthSmallest图示.png ├── longestWPI.java ├── longestWPI.md ├── maxChunksToSorted.java ├── maxChunksToSorted.md ├── maxChunksToSorted图示.png ├── nextPermutation.java ├── nextPermutation.md ├── searchMatrix.java ├── searchMatrix.md └── searchMatrix图示.png ├── BFSorDFS ├── findCircleNum.java ├── findCircleNum.md ├── ladderLength.java ├── ladderLength.md ├── ladderLength.png ├── maxDistance.java ├── maxDistance.md ├── pacificAtlantic.java ├── pacificAtlantic.md ├── shortestPathBinaryMatrix.java ├── shortestPathBinaryMatrix.md ├── updateMatrix.java └── updateMatrix.md ├── BackTracking ├── combinationSum.java ├── combinationSum.md ├── combinationSum2.java ├── combinationSum2.md ├── combinationSum3.java ├── combinationSum3.md ├── combine77.java ├── combine77.md ├── exist.java ├── exist.md ├── findSubsequences491.java ├── findSubsequences491.md ├── generateParenthesis.java ├── generateParenthesis.md ├── letterCombinations17.java ├── letterCombinations17.md ├── maxAreaOfIsland.java ├── maxAreaOfIsland.md ├── numIslands.java ├── numIslands.md ├── partition131.java ├── partition131.md ├── permute46.java ├── permute46.md ├── permuteUnique47.java ├── permuteUnique47.md ├── restoreIpAddresses.java ├── restoreIpAddresses.md ├── solve130.java ├── solve130.md ├── subsets78.java ├── subsets78.md ├── subsetsWithDup90.java └── subsetsWithDup90.md ├── BinarySearch ├── findDuplicate.java ├── findDuplicate.md ├── singleNonDuplicate.java └── singleNonDuplicate.md ├── BitOperation ├── singleNumber260.java └── singleNumber260.md ├── DP ├── maxProduct.java ├── maxProduct.md ├── minPathSum64.java ├── minPathSum64.md ├── rob213.java ├── rob213.md ├── rob337.java ├── rob337.md ├── uniquePaths62.java ├── uniquePaths62.md ├── uniquePathsWithObstacles.md └── uniquePathsWithObstacles63.java ├── LinkedList ├── addTwoNumbers.java ├── addTwoNumbers.md ├── deleteDuplicates82.java ├── deleteDuplicates82.jpg ├── deleteDuplicates82.md ├── oddEvenList.java ├── oddEvenList.jpg ├── oddEvenList.md ├── removeNthFromEnd.java ├── removeNthFromEnd.md ├── rotateRight.java ├── rotateRight.md ├── rotateRight图示.png ├── splitListToParts.java ├── splitListToParts.jpg ├── splitListToParts.md ├── swapPairs.java ├── swapPairs.md └── swapPairs图示.png ├── Sort ├── findKthLargest.java ├── findKthLargest.md ├── frequencySort.java ├── frequencySort.md ├── sortColors.java ├── sortColors.md ├── topKFrequent.java └── topKFrequent.md ├── StackAndQueue ├── dailyTemperatures739.java ├── 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