My Solutions of some LeetCode problems

(This item is generated with update-readme.py.)

409 solved problems from 13 categories:

• Array And Hashtable - 64 problems
• Backtracking - 33 problems
• Binary Search - 19 problems
• Concurrency - 3 problems
• Database - 7 problems
• Design - 18 problems
• Dynamic Programming - 42 problems
• Linkedlist - 25 problems
• Math - 27 problems
• Others - 53 problems
• Stack - 14 problems
• String - 18 problems
• Tree - 86 problems

Array And Hashtable

Index	Problem Description	My Solution
1	3Sum	Sum3.java
2	3Sum Closest	SumClosest3.java
3	4Sum	Sum4.java
4	Add to Array-Form of Integer	AddToArrayFormOfInteger.java
5	Array Partition I	ArrayPartition1.java
6	Bulls And Cows	BullsAndCows.java
7	Check If N and Its Double Exist	CheckIfNAndItsDoubleExist.java
8	Contiguous Array	ContiguousArray.java
9	Counting Elements	CountingElements.java
10	Duplicate Zeros	DuplicateZeros.java
11	Find All Anagrams in a String	FindAllAnagramsInString.java
12	Find All Duplicates in an Array	FindAllDuplicatesInAnArray.java
13	Find All Numbers Disappeared in an Array	FindAllNumbersDisappearedInAnArray.java
14	Find Common Characters	FindCommonCharacters.java
15	Find Numbers with Even Number of Digits	FindNumbersWithEvenNumberOfDigits.java
16	Find The Difference	FindTheDifference.java
17	Find the Duplicate Number	FindTheDuplicateNumber.java
18	First Unique Character in a String	FirstUniqueCharacterinString.java
19	Game of Life	GameOfLife.java
20	Group Anagrams	GroupAnagrams.java
21	H-Index	HIndex.java
22	Height Checker	HeightChecker.java
23	Intersection Of Two Arrays	IntersectionOfTwoArrays.java
24	Intersection of Two Arrays II	IntersectionOfTwoArrays2.java
25	Is Subsequence	IsSubsequence.java
26	Island Perimeter	IslandPerimeter.java
27	Isomorphic Strings	IsomorphicStrings.java
28	Jewels and Stones	JewelsAndStones.java
29	K-diff Pairs in an Array	KdiffPairsInAnArray.java
30	Longest Continuous Increasing Subsequence	LongestContinuousIncreasingSubsequence.java
31	Longest Palindrome	LongestPalindrom.java
32	Longest Substring Without Repeating Characters	LongestSubstringWithoutRepeatingCharacters.java
33	Longest Word in Dictionary	LongestWordInDictionary.java
34	Majority Element	MajorityElement.java
35	Majority Element II	MajorityElement2.java
36	Max Consecutive Ones	MaxConsecutiveOnes.java
37	Maximum Sum Circular Subarray	MaximumSumCircularSubarray.java
38	MaximumAverageSubarray II	MaximumAverageSubarray1.java
39	Merge Intervals	MergeIntervals.java
40	Minimum Index Sum of Two Lists	MinimumIndexSumOfTwoLists.java
41	Monotonic Array	MonotonicArray.java
42	Move Zeroes	MoveZeroes.java
43	Pairs of Songs With Total Durations Divisible by 60	PairsOfSongsWithTotalDurationsDivisibleBy60.java
44	Plus One	PlusOne.java
45	Product of Array Except Self	ProductOfArrayExceptSelf.java
46	Ransom Note	RansomNote.java
47	Remove Duplicates from Sorted Array	RemoveDuplicatesFromSortedArray.java
48	Remove Element	RemoveElement.java
49	Rotate Array	RotateArray.java
50	Sort Array By Parity	SortArrayByParity.java
51	Sort Characters By Frequency	SortCharactersByFrequency.java
52	Spiral Matrix	SpiralMatrix.java
53	Spiral Matrix II	SpiralMatrix2.java
54	Squares of a Sorted Array	SquaresOfSortedArray.java
55	Subarray Sum Equals K	SubarraySumEqualsK.java
56	Subarray Sums Divisible by K	SubarraySumsDivisiblebyK.java
57	Summary Ranges	SummaryRanges.java
58	Two Sum II - Input array is sorted	Sum2InputArrayIsSorted.java
59	Two sum	TwoSum.java
60	Unique Number of Occurrences	UniqueNumberOfOccurrences.java
61	Valid Anagram	ValidAnagram.java
62	Valid Mountain Array	ValidMountainArray.java
63	Valid Sudoku	ValidSudoku.java
64	Word Pattern	WordPattern.java

Backtracking

Index	Problem Description	My Solution
1	Additive Number	AdditiveNumber.java
2	All Paths From Source to Target	AllPathsFromSourceToTarget.java
3	Beautiful Arrangement	BeautifulArrangement.java
4	Combination Sum	CombinationSum.java
5	Combination Sum II	CombinationSum2.java
6	Combination Sum III	CombinationSum3.java
7	Combinations	Combinations.java
8	Generate Parentheses	GenerateParentheses.java
9	Gray Code	GrayCode.java
10	Increasing Subsequences	IncreasingSubsequences.java
11	Iterator for Combination	IteratorForCombination.java
12	Letter Case Permutation	LetterCasePermutation.java
13	Letter Combinations of a Phone Number	LetterCombinationsOfPhoneNumber.java
14	Letter Tile Possibilities	LetterTilePossibilities.java
15	Maximum Length of a Concatenated String with Unique Characters	MaximumLengthOfConcatenatedStringWithUniqueCharacters.java
16	N-Queens	NQueens.java
17	N-Queens II	NQueens2.java
18	Number of Squareful Arrays	NumberOfSquarefulArrays.java
19	Palindrome Partitioning	PalindromePartitioning.java
20	Path with Maximum Gold	PathWithMaximumGold.java
21	Permutation Sequence	PermutationSequence.java
22	Permutations	Permutations.java
23	Permutations II	Permutations2.java
24	Restore IP Addresses	RestoreIPAddresses.java
25	Sequential Digits	SequentialDigits.java
26	Split Array into Fibonacci Sequence	SplitArrayIntoFibonacciSequence.java
27	Subsets	Subsets.java
28	Subsets II	Subsets2.java
29	Sudoku Solver	SudokuSolver.java
30	The k-th Lexicographical String of All Happy Strings of Length n	TheKthLexicographicalStringOfAllHappyStringsOfLengthN.java
31	Unique Paths III	UniquePaths3.java
32	Word Search	WordSearch.java
33	Word Search II	WordSearch2.java

Binary Search

Index	Problem Description	My Solution
1	Binary Search	BinarySearch.java
2	Count Negative Numbers in a Sorted Matrix	CountNegativeNumbersInSortedMatrix.java
3	Find First and Last Position of Element in Sorted Array	FindFirstAndLastPositionOfElementInSortedArray.java
4	Find Minimum in Rotated Sorted Array	FindMinimumInRotatedSortedArray.java
5	Find Minimum in Rotated Sorted Array II	FindMinimumInRotatedSortedArray2.java
6	Find Peak Element	FindPeakElement.java
7	Find Positive Integer Solution for a Given Equation	FindPositiveIntegerSolutionforGivenEquation.java
8	First Bad Version	FirstBadVersion.java
9	Guess Number Higher or Lower	GuessNumberHigherOrLower.java
10	Kth Smallest Element in a Sorted Matrix	KthSmallestElementInSortedMatrix.java
11	Leftmost Column with at Least a One	LeftmostColumnWithAtLeastOne.java
12	Random Pick with Weight	RandomPickWithWeight.java
13	Search Insert Position	SearchInsertPosition.java
14	Search a 2D Matrix	Search2DMatrix.java
15	Search a 2D Matrix II	Search2DMatrix2.java
16	Search in Rotated Sorted Array	SearchInRotatedSortedArray.java
17	Search in Rotated Sorted Array II	SearchInRotatedSortedArray2.java
18	Single Element in a Sorted Array	SingleElementInSortedArray.java
19	Time Based Key-Value Store	TimeBasedKeyValueStore.java

Concurrency

Index	Problem Description	My Solution
1	Print Foobar Alternately	PrintFooBarAlternately.java
2	Print Zero Even Odd	PrintZeroEvenOdd.java
3	Print in Order	PrintInOrder.java

Database

Index	Problem Description	My Solution
1	Big Countries	BigCountries.sql
2	Classes More Than 5 Students	ClassesMoreThan5Students.sql
3	Combine Two Tables	CombineTwoTables.sql
4	Customers Who Never Order	CustomersWhoNeverOrder.sql
5	Duplicate Emails	DuplicateEmails.sql
6	Employees Earning More Than Their Managers	EmployeesEarningMoreThanTheirManagers.sql
7	Not Boring Movies	NotBoringMovies.sql

Design

Index	Problem Description	My Solution
1	Construct Quad Tree	ConstructQuadTree.java
2	Design Add and Search Words Data Structure	DesignAndSearchWordDataStructure.java
3	Design Circular Deque	DesignCircularDeque.java
4	Design Circular Queue	DesignCircularQueue.java
5	Design HashMap	DesignHashMap.java
6	Design HashSet	DesignHashSet.java
7	Design Linked List	DesignLinkedList.java
8	Design a Stack With Increment Operation	DesignStackWithIncrementOperation.java
9	First Unique Number	FirstUniqueNumber.java
10	Flatten Nested List Iterator	FlattenNestedListIterator.java
11	Implement Queue using Stacks	ImplementQueueUsingStacks.java
12	Implement Stack using Queues	ImplementStackUsingQueues.java
13	Implement Trie (Prefix Tree)	ImplementTriePrefixTree.java
14	Insert Delete GetRandom O(1)	InsertDeleteGetRandomO1.java
15	LRU Cache	LRUCache.java
16	Product of the Last K Numbers	ProductOfTheLastKNumbers.java
17	Range Sum Query - Mutable	RangeSumQueryMutable.java
18	Shuffle an Array	ShuffleAnArray.java

Dynamic Programming

Index	Problem Description	My Solution
1	2 Keys Keyboard	TwoKeysKeyboard.java
2	Climbing Stairs	ClimbingStairs.java
3	Coin Change	CoinChange.java
4	Coin Change 2	CoinChange2.java
5	Count Square Submatrices with All Ones	CountSquareSubmatricesWithAllOnes.java
6	Counting Bits	CountingBits.java
7	Edit Distance	EditDistance.java
8	House Robber	HouseRobber.java
9	House Robber II	HouseRobber2.java
10	Jump Game	JumpGame.java
11	Knight Probability in Chessboard	KnightProbabilityInChessboard.java
12	Largest Divisible Subset	LargestDivisibleSubset.java
13	Longest Arithmetic Sequence	LongestArithmeticSequence.java
14	Longest Arithmetic Subsequence of Given Difference	LongestArithmeticSubsequenceOfGivenDifference.java
15	Longest Common Subsequence	LongestCommonSubsequence.java
16	Longest Increasing Subsequence	LongestIncreasingSubsequence.java
17	Longest Palindromic Subsequence	LongestPalindromicSubsequence.java
18	Longest Palindromic Substring	LongestPalindromicSubstring.java
19	Matrix Block Sum	MatrixBlockSum.java
20	Maximal Square	MaximalSquare.java
21	Maximum Length of Pair Chain	MaximumLengthOfPairChain.java
22	Maximum Product Subarray	MaximumProductSubarray.java
23	Maximum Subarray	MaximumSubarray.java
24	Min Cost Climbing Stairs	MinCostClimbingStairs.java
25	Minimum Falling Path Sum	MinimumFallingPathSum.java
26	Minimum Path Sum	MinimumPathSum.java
27	N-th Tribonacci Number	NthTribonacciNumber.java
28	Number of Dice Rolls With Target Sum	NumberOfDiceRollsWithTargetSum.java
29	Number of Longest Increasing Subsequence	NumberOfLongestIncreasingSubsequence.java
30	Out of Boundary Paths	OutOfBoundaryPaths.java
31	Palindromic Substrings	PalindromicSubstrings.java
32	Partition Equal Subset Sum	PartitionEqualSubsetSum.java
33	Perfect Squares	PerfectSquares.java
34	Range Sum Query - Immutable	RangeSumQueryImmutable.java
35	Range Sum Query 2D - Immutable	RangeSumQuery2DImmutable.java
36	Target Sum	TargetSum.java
37	Triangle	Triangle.java
38	Uncrossed Lines	UncrossedLines.java
39	Unique Paths	UniquePaths.java
40	Unique Paths II	UniquePaths2.java
41	Word Break	WordBreak.java
42	WordBreak II	WordBreak2.java

Linkedlist

Index	Problem Description	My Solution
1	Add Two Numbers	AddTwoNumbers.java
2	Add Two Numbers II	AddTwoNumbers2.java
3	Convert Binary Number in a Linked List to Integer	BinaryNumberToInteger.java
4	Copy List with Random Pointer	CopyListWithRandomPointer.java
5	Delete Node in a Linked List	DeleteNodeLinkeList.java
6	Intersection of Two Linked Lists	IntersectionofTwoLinkedLists.java
7	Linked List Cycle	LinkedListCycle.java
8	Linked List Cycle II	LinkedListCycle2.java
9	Merge Two Sorted Lists	MergeTwoSortedLists.java
10	Merge k Sorted Lists	MergeKsortedLists.java
11	Middle Of The Linked List	MiddleOfLinkedList.java
12	Odd Even Linked List	OddEvenLinkedList.java
13	Palindrome Linked List	PalindromeLinkedList.java
14	Partition List	PartitionList.java
15	Remove Duplicates From Sorted List	RemoveDuplicatesFromSortedList.java
16	Remove Duplicates from Sorted List II	RemoveDuplicatesFromSortedList2.java
17	Remove LinkedList Elements	RemoveLinkedListElements.java
18	Remove Nth Node From End of List	RemoveNthNodeFromEndOfList.java
19	Remove Zero Sum Consecutive Nodes from Linked List	RemoveZeroSumConsecutiveNodesFromLinkedList.java
20	Reorder List	ReorderList.java
21	Reverse Linked List	ReverseLinkedList.java
22	Reverse Linked List II	ReverseLinkedList2.java
23	Rotate List	RotateList.java
24	Split Linked List in Parts	SplitLinkedListInParts.java
25	Swap Nodes in Pairs	SwapNodesInPairs.java

Math

Index	Problem Description	My Solution
1	Add Digits	AddDigits.java
2	Angle Between Hands of a Clock	AngleBetweenHandsOfClock.java
3	Arranging Coins	ArrangingCoins.java
4	Check If It Is a Straight Line	CheckIfItIsStraightLine.java
5	Count Numbers with Unique Digits	CountNumbersWithUniqueDigits.java
6	Count Primes	CountPrimes.java
7	Divisible and Non-divisible Sums Difference	DivisibleAndNonDivisibleSumsDifference.java
8	Excel Sheet Column Number	ExcelSheetColumnNumber.java
9	Happy Number	HappyNumber.java
10	Integer to Roman	IntegerToRoman.java
11	Largest Perimeter Triangle	LargestPerimeterTriangle.java
12	Largest Time for Given Digits	LargestTimeForGivenDigits.java
13	Missing Number	MissingNumber.java
14	Palindrome Number	PalindromeNumber.java
15	Power of Four	PowerOfFour.java
16	Power of Three	PowerOfThree.java
17	Power of Two	PowerOfTwo.java
18	Rectangle Area	RectangleArea.java
19	Rectangle Overlap	RectangleOverlap.java
20	Reverse Integer	ReverseInteger.java
21	Roman to Integer	RomanToInteger.java
22	Rotate Image	RotateImage.java
23	Sqrt(x)	Sqrt.java
24	String to Integer (atoi)	StringToIntegerAtoi.java
25	Sum of Square Numbers	SumOfSquareNumbers.java
26	The kth Factor of n	TheKthFactorOfN.java
27	ValidPerfectSquare	ValidPerfectSquare.java

Others

Index	Problem Description	My Solution
1	01 Matrix	Matrix01.java
2	Base 7	Base7.java
3	Best Time to Buy and Sell Stock	BestTimeToBuyAndSellStock.java
4	Best Time to Buy and Sell Stock II	BestTimeToBuyAndSellStock2.java
5	Binary Gap	BinaryGap.java
6	Bitwise AND of Numbers Range	BitwiseAndOfNumbersRange.java
7	Car Pooling	CarPooling.java
8	Clone Graph	CloneGraph.java
9	Container With Most Water	ContainerWithMostWater.java
10	Contains Duplicate	ContainsDuplicate.java
11	Contains Duplicate II	ContainsDuplicate2.java
12	Contains Duplicate III	ContainsDuplicate3.java
13	Count and Say	CountAndSay.java
14	Course Schedule	CourseSchedule.java
15	Day of the Week	DayOfTheWeek.java
16	Find the Town Judge	FindTheTownJudge.java
17	Flood Fill	FloodFill.java
18	K Closest Points to Origin	KClosestPointsToOrigin.java
19	K-th Symbol in Grammar	KthSymbolInGrammar.java
20	Kth Largest Element in a Stream	KthLargestElementInStream.java
21	Kth Largest Element in an Array	KthLargestElementInArray.java
22	Last Stone Weight	LastStoneWeight.java
23	Maximum Points You Can Obtain from Cards	MaximumPointsYouCanObtainFromCards.java
24	Minimum Deletion Cost to Avoid Repeating Letters	MinimumDeletionCostToAvoidRepeatingLetters.java
25	Minimum Size Subarray Sum	MinimumSizeSubarraySum.java
26	Number Complement	NumberComplement.java
27	Number of 1 Bits	NumberOf1Bits.java
28	Number of Islands	NumberOfIslands.java
29	Numbers With Same Consecutive Differences	NumbersWithSameConsecutiveDifferences.java
30	Pancake Sorting	PancakeSorting.java
31	Partition Labels	PartitionLabels.java
32	Pascal's Triangle	PascalTriangle.java
33	Pascal's Triangle II	PascalTriangle2.java
34	Perform String Shifts	PerformStringShifts.java
35	Permutation in String	PermutationInString.java
36	Possible Bipartition	PossibleBipartition.java
37	Queue Reconstruction by Height	QueueReconstructionByHeight.java
38	Reconstruct Itinerary	ReconstructItinerary.java
39	Redundant Connection	RedundantConnection.java
40	Reverse Bits	ReverseBits.java
41	Rotting Oranges	RottingOranges.java
42	Shortest Path in Binary Matrix	ShortestPathInBinaryMatrix.java
43	Single Number	SingleNumber.java
44	Single Number	SingleNumber.java
45	Sort Colors	SortColors.java
46	Sort an Array	SortAnArray.java
47	Surrounded Regions	SurroundedRegions.java
48	Time Needed to Inform All Employees	TimeNeededToInformAllEmployees.java
49	Top K Frequent Elements	TopKFrequentElements.java
50	Top K Frequent Words	TopKFrequentWords.java
51	Two City Scheduling	TwoCityScheduling.java
52	Ugly Number	UglyNumber.java
53	Ugly Number II	UglyNumber2.java

Stack

Index	Problem Description	My Solution
1	132 Pattern	Pattern132.java
2	Backspace String Compare	BackspaceStringCompare.java
3	Baseball Game	BaseballGame.java
4	Evaluate Reverse Polish Notation	EvaluateReversePolishNotation.java
5	Min Stack	MinStack.java
6	Next Greater Element I	NextGreaterElement1.java
7	Next Greater Element II	NextGreaterElement2.java
8	Next Greater Node In Linked List	NextGreaterNodeInLinkedList.java
9	Online Stock Span	OnlineStockSpan.java
10	Remove All Adjacent Duplicates In String	RemoveAllAdjacentDuplicatesInString.java
11	Remove K Digits	RemoveKdigits.java
12	Remove Outermost Parentheses	RemoveOutermostParentheses.java
13	Simplify Path	SimplifyPath.java
14	Valid Parentheses	ValidParentheses.java

String

Index	Problem Description	My Solution
1	Add Binary	AddBinary.java
2	Add Strings	AddStrings.java
3	Alphabet Board Path	AlphabetBoardPath.java
4	Compare Version Numbers	CompareVersionNumbers.java
5	Detect Capital	DetectCapital.java
6	Goat Latin	GoatLatin.java
7	Implement strStr()	ImplementStrStr.java
8	Longest Common Prefix	LongestCommonPrefix.java
9	Maximum Score After Splitting a String	MaximumScoreAfterSplittingString.java
10	Multiply Strings	MultiplyStrings.java
11	Repeated Substring Pattern	RepeatedSubstringPattern.java
12	Reverse String	ReverseString.java
13	Reverse Words in a String	ReverseWordsInString.java
14	String Compression	StringCompression.java
15	Valid Palindrome	ValidPalindrome.java
16	Valid Parenthesis String	ValidParenthesisString.java
17	Verifying an Alien Dictionary	VerifyingAnAlienDictionary.java
18	ZigZag Conversion	ZigZagConversion.java

Tree

Index	Problem Description	My Solution
1	Add One Row to Tree	AddOneRowToTree.java
2	All Elements in Two Binary Search Trees	AllElementsInTwoBinarySearchTrees.java
3	All Nodes Distance K in Binary Tree	AllNodesDistanceKinBinaryTree.java
4	All Possible Full Binary Trees	AllPossibleFullBinaryTrees.java
5	Average of Levels in Binary Tree	AverageOfLevelsInBinaryTree.java
6	Balance a Binary Search Tree	BalanceBinarySearchTree.java
7	Balanced Binary Tree	BalancedBinaryTree.java
8	Binary Search Tree Iterator	BinarySearchTreeIterator.java
9	Binary Search Tree to Greater Sum Tree	BinarySearchTreeToGreaterSumTree.java
10	Binary Tree Coloring Game	BinaryTreeColoringGame.java
11	Binary Tree Inorder Traversal	BinaryTreeInorderTraversal.java
12	Binary Tree Level Order Traversal	BinaryTreeLevelOrderTraversal.java
13	Binary Tree Level Order Traversal II	BinaryTreeLevelOrderTraversal2.java
14	Binary Tree Maximum Path Sum	BinaryTreeMaximumPathSum.java
15	Binary Tree Paths	BinaryTreePaths.java
16	Binary Tree Postorder Traversal	BinaryTreePostorderTraversal.java
17	Binary Tree Preorder Traversal	BinaryTreePreorderTraversal.java
18	Binary Tree Pruning	BinaryTreePruning.java
19	Binary Tree Right Side View	BinaryTreeRightSideView.java
20	Binary Tree Tilt	BinaryTreeTilt.java
21	Binary Tree Zigzag Level Order Traversal	BinaryTreeZigzagLevelOrderTraversal.java
22	Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree	CheckIfStringIsValidSequenceFromRootToLeavesPath.java
23	Construct Binary Search Tree from Preorder Traversal	ConstructBinarySearchTreeFromPreorderTraversal.java
24	Construct String from Binary Tree	ConstructStringFromBinaryTree.java
25	Convert BST to Greater Tree	ConvertBSTToGreaterTree.java
26	Convert Sorted Array to Binary Search Tree	ConvertSortedArrayToBinarySearchTree.java
27	Convert Sorted List to Binary Search Tree	ConvertSortedListToBinarySearchTree.java
28	Count Complete Tree Nodes	CountCompleteTreeNodes.java
29	Cousins in Binary Tree	CousinsInBinaryTree.java
30	Deepest Leaves Sum	DeepestLeavesSum.java
31	Delete Leaves With a Given Value	DeleteLeavesWithGivenValue.java
32	Delete Node in a BST	DeleteNodeInBST.java
33	Delete Nodes And Return Forest	DeleteNodesAndReturnForest.java
34	Diameter of Binary Tree	DiameterOfBinaryTree.java
35	Find Duplicate Subtrees	FindDuplicateSubtrees.java
36	Find Largest Value in Each Tree Row	FindLargestValueInEachTreeRow.java
37	Find Mode in Binary Search Tree	FindModeInBinarySearchTree.java
38	Find a Corresponding Node of a Binary Tree in a Clone of That Tree	FindCorrespondingNodeOfBinaryTreeInCloneOfThatTree.java
39	Flatten Binary Tree to Linked List	FlattenBinaryTreeToLinkedList.java
40	Increasing Order Search Tree	IncreasingOrderSearchTree.java
41	Insert into a Binary Search Tree	InsertIntoBinarySearchTree.java
42	Invert Binary Tree	InvertBinaryTree.java
43	Kth Smallest Element in a BST	KthSmallestElementInBST.java
44	Leaf-Similar Trees	LeafSimilarTrees.java
45	Lowest Common Ancestor of Deepest Leaves	LowestCommonAncestorOfDeepestLeaves.java
46	Lowest Common Ancestor of a Binary Search Tree	LowestCommonAncestorOfBinarySearchTree.java
47	Lowest Common Ancestor of a Binary Tree	LowestCommonAncestorOfBinaryTree.java
48	Lowest Common Ancestor of a Binary Tree	LowestCommonAncestorOfBinaryTree.java
49	Maximum Binary Tree	MaximumBinaryTree.java
50	Maximum Binary Tree II	MaximumBinaryTree2.java
51	Maximum Depth Of Binary Tree	MaximumDepthOfBinaryTree.java
52	Maximum Depth of N-ary Tree	MaximumDepthOfNaryTree.java
53	Maximum Difference Between Node and Ancestor	MaximumDifferenceBetweenNodeAndAncestor.java
54	Maximum Product of Splitted Binary Tree	MaximumProductOfSplittedBinaryTree.java
55	Maximum Sum BST in Binary Tree	MaximumSumBSTinBinaryTree.java
56	Merge Two Binary Trees	MergeTwoBinaryTrees.java
57	Minimum Absolute Difference in BST	MinimumAbsoluteDifferenceInBST.java
58	Minimum Depth of BinaryTree	MinimumDepthOfBinaryTree.java
59	Minimum Distance Between BST Nodes	MinimumDistanceBetweenBSTNodes.java
60	Most Frequent Subtree Sum	MostFrequentSubtreeSum.java
61	N-ary Tree Level Order Traversal	NaryTreeLevelOrderTraversal.java
62	N-ary Tree Postorder Traversal	NaryTreePostorderTraversal.java
63	N-ary Tree Preorder Traversal	NaryTreePreorderTraversal.java
64	Path Sum	PathSum.java
65	Path Sum II	PathSum2.java
66	Path Sum III	PathSum3.java
67	Populating Next Right Pointers in Each Node	PopulatingNextRightPointersInEachNode2.java
68	Populating Next Right Pointers in Each Node II	PopulatingNextRightPointersInEachNode2.java
69	Range Sum of BST	RangeSumOfBST.java
70	Recover Binary Search Tree	RecoverBinarySearchTree.java
71	Same Tree	SameTree.java
72	Search in a Binary Search Tree	SearchBinarySearchTree.java
73	Second Minimum Node In a Binary Tree	SecondMinimumNodeInBinaryTree.java
74	Serialize and Deserialize BST	SerializeAndDeserializeBST.java
75	Serialize and Deserialize Binary Tree	SerializeAndDeserializeBinaryTree.java
76	Smallest String Starting From Leaf	SmallestStringStartingFromLeaf.java
77	Smallest Subtree with all the Deepest Nodes	SmallestSubtreeWithallTheDeepestNodes.java
78	Subtree of Another Tree	SubtreeOfAnotherTree.java
79	Sum Root to Leaf Numbers	SumRootToLeafNumbers.java
80	Sum of Left Leaves	SumOfLeftLeaves.java
81	Sum of Root To Leaf Binary Numbers	SumOfRootToLeafBinaryNumbers.java
82	Symmetric Tree	SymmetricTree.java
83	Two Sum IV - Input is a BST	TwoSum4InputBST.java
84	Univalued Binary Tree	UnivaluedBinaryTree.java
85	Validate Binary Search Tree	ValidateBinarySearchTree.java
86	Vertical Order Traversal of a Binary Tree	VerticalOrderTraversalOfBinaryTree.java

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