LeetCode

Learning & Solving Problems on LeetCode

Table of Content

• Problems
• Challenge
  • May Challenge
  • June Challenge
  • July Challenge
  • August Challenge
• Author
• Contributors
• License

Problems [Swift]

• 1_TwoSum

• 7_ReverseInteger

• 9_PalindromeNumber

• 15_3Sum

• 35_SearchInsertPosition

• 50_Pow(x, n)

• 53_MaximumSubarray

• 60_PermutationSequence

• 62_UniquePaths

• 66_PlusOne

• 67_AddBinary

• 69_Sqrt(x)

• 70_ClimbingStairs

• 73_SetMatrixZeroes

• 78_Subsets

• 79_WordSearch

• 96_UniqueBinarySearchTrees

• 100_SameTree

• 103_BinaryTreeZigzagLevelOrderTraversal

• 106_ConstructBinaryTreeFromInorderAndPostorderTraversal

• 107_BinaryTreeLevelOrderTraversal-II

• 119_Pascal'sTriangle-II

• 125_ValidPalindrome

• 136_SingleNumber.playground

• 137_SingleNumber-II

• 140_WordBreak-II

• 151_ReverseWordsInAString

• 154_FindMinimumInRotatedSortedArray-II

• 171_ExcelSheetColumnNumber

• 174_DungeonGame

• 190_ReverseBits

• 203_RemoveLinkedListElements

• 206_ReverseLinkedList

• 210_CourseSchedule-II

• 211_AddAndSearchWord_DataStructureDesign

• 215_KthLargestElementInAnArray

• 220_ContainsDuplicate-III

• 222_CountCompleteTreeNodes

• 258_AddDigits

• 260_SingleNumber-III

• 264_UglyNumber-II

• 274_H-Index

• 287_FindTheDuplicateNumber

• 289_GameOfLife

• 309_BestTimeToBuyAndSellStockWithCooldown

• 342_PowerOfFour

• 345_ReverseVowelsOfAString

• 347_TopKFrequentElements

• 371_SumOfTwoIntegers

• 404_SumOfLeftLeaves

• 406_QueueReconstructionByHeight

• 412_FizzBuzz

• 430_FlattenAMultilevelDoublyLinkedList

• 436_FindRightInterval

• 437_PathSum-III

• 441_ArrangingCoins

• 442_FindAllDuplicatesInAnArray

• 450_DeleteNodeInABST

• 459_RepeatedSubstringPattern

• 463_IslandPerimeter

• 470_ImplementRand10()UsingRand7()

• 476_NumberComplement

• 497_RandomPointInNonOverlappingRectangles

• 518_CoinChange2

• 621_TaskScheduler

• 662_MaximumWidthOfBinaryTree

• 680_ValidPalindrome-II

• 705_DesignHashSet

• 709_ToLowerCase

• 763_PartitionLabels

• 797_AllPathsFromSourceToTarget

• 835_Image_Overlap

• 917_ReverseOnlyLetters

• 952_LargestComponentSizeByCommonFactor

• 957_PrisonCellsAfterNDays

• 969_PancakeSorting

• 983_MinimumCostForTickets

• 987_VerticalOrderTraversalOfABinaryTree

• 993_CousinsInBinaryTree

• 994_RottingOranges

• 1032_StreamOfCharacters

• 1305_AllElementsInTwoBinarySearchTrees

• 1344_AngleBetweenHandsOfAClock

• 1470_ShuffleTheArray

• 1480_RunningSumOf1DArray

• 1507_ReformatDate

• 1512_NumberOfGoodPairs

Challenge

May Challenge [Swift]

Week 1: May 1st–May 7th	Week 2: May 8th–May 14th	Week 3: May 15th–May 21st	Week 4: May 22nd–May 28th	Week 5: May 29th–May 31st
First Bad Version	Check Straight Line	Maximum Sum Circular Subarray	Sort Characters by Frequency	Course Schedule
Jewels and Stones	Valid Perfect Square	Odd Even LinkedList	Interval List Intersections	K Closest Points to Origin
Ransom Note	Find The Town Judge	Find All Anagrams In a String	Construct Binary Search Tree From Preorder Traversal	Edit Distance
Number Complement	Flood Fill	Permutation In String	Uncrossed Lines
First Unique Character In String	Single Element In A Sorted Array	Online Stock Span	Contiguous Array
Majority Element	Remove K Digits	Kth Smallest Element In a BST	Possible Bipartition
Cousins In Binary Tree	Implement Trie Prefix Tree	Count Square Submatrices With All Ones	Counting Bits

June Challenge [Swift, Python, CPP]

Week 1: June 1st–June 7th	Week 2: June 8th–June 14th	Week 3: June 15th–June 21st	Week 4: June 22nd–June 28th	Week 5: June 29th–June 30th
Invert Binary Tree	Power of Two	Search in a Binary Search Tree	Single Number II	Unique Paths
Delete Node	Is Subsequence	Validate IP Address	Count Complete Tree Nodes	Word Search II
Two City Scheduling	Search Insert Position	Surrounded Regions	Unique Binary Search Trees
Reverse String	Sort Colors	H Index-II	Find the Duplicate Number
Random Pick With Weight	Insert Delete Get Random	Longest Duplicate Substring	Sum Root to Leaf Numbers
Queue Reconstruction By Height	Largest Divisible Subset	Permutation Sequence	Perfect Squares
Coin Change 2	Cheapest Flights Within K Stops	Dungeon Game	Reconstruct Itinerary

July Challenge [Swift]

Week 1: July 1st–July 7th	Week 2: July 8th–July 14th	Week 3: July 15th–July 21st	Week 4: July 22nd–July 28th	Week 5: July 29th–July 31st
Arranging Coins	3 Sum	Reverse Words In a String	Binary Tree Zigzag Level Order Traversal	Best Time to Buy and Sell Stock With Cooldown
Binary Tree Level Order Traversal-II	Maximum Width of Binary Tree	Pow(x,n)	Single Number-III	Word Break II
Prison Cells After N Days	Flatten a Multilevel Doubly LinkedList	Top K Frequent Elements	All Paths From Source To Target	ClimbingStairs
Ugly Number-II	Subsets	Course Schedule - II	Find Minimum In Rotated Sorted Array II
Hamming Distance	Reverse Bits	Remove LinkedList Elements	Add Digits
Plus One	Same Tree	Word Search	Construct Binary Tree from Inorder and Postorder Traversal
Island Perimeter	Angle Between Hands of a Clock	Binary Tree Zigzag Level Order Traversal	Task Scheduler

August Challenge [Swift]

Week 1: Aug 1st–Aug 7th	Week 2: Aug 8th–Aug 14th	Week 3: Aug 15th–Aug 21st	Week 4: Aug 22nd–Aug 28th	Week 5: Aug 29th–Aug 31st
Detect Capital	Path Sum - III	Non Overlapping Intervals	Random Point In Non Overlapping Rectangles	Pancake Sorting
Design HashSet	Rotting Oranges	Best Time To Buy And Sell Stocks - III	Stream Of Characters	Largest Component Size By Common Factor
Valid Palindrome	Excel Sheet Column Number	Distribute Candies To People	Sum Of Left Leaves	Delete Node In a BST
Power Of Four	H-Index	Numbers With Same Consecutive Differences	Minimum Cost For Tickets
Add and Search Word Data Structure Design	Pascal's Triangle - II	Goat Latin	Fizz Buzz
Find All Duplicates In An Array	Iterator For Combination	Reorder List	Find Right Interval
Vertical Order Traversal Of A Binary Tree	Longest Palindrome	Sort Array By Parity	Implement Rand10() Using Rand7()

Author

Milan Panchal, follow me on:

1. Twitter (@milan_panchal24)
2. Github (/milanpanchal)
3. Medium (https://medium.com/@milanpanchal24)
4. LinkedIn (/in/milanpanchal/)
5. LeedCode (/milanpanchal)

Contributors

• Milan Panchal

• Chintan Patel

License

MIT

Free Software, Hell Yeah!