A repository intended to register my LeetCode challenges developed with Typescript.

Table of Contents

• Table of Contents
• How to Run a Challenge
  • Installing Dependencies
  • Executing Code
• Easy Problems
• Medium Problems
• Hard Problems

How to Run a Challenge

Installing Dependencies

Almost every challenge is presented with some test cases and console logs to visualize them. So to execute the code, you can use ts-node, tsx or any Typescript compiler to execute and automatically compile code.

But firstly it's needed a version of Node to be able to install the CLI commands below.

To install and use any of them globally:

Installing tsx:

npm install -g tsx

or...

Installing ts-node:

npm install -g ts-node

Executing Code

To execute any of the code challenges presented in this repository, it's needed to comment all the remaining approach's functions in order to execute the code like below.

With tsx:

tsx ./mediumChallenges/primeSubtractionOperation.ts

With ts-node:

ts-node ./mediumChallenges/primeSubtractionOperation.ts

Easy Problems

Challenge Name	Topics	File
145. Binary Tree Postorder Traversal	Stack, Tree, Depth-First Search, Binary Tree	binaryTreePostorderTraversal.ts
1455. Check If a Word Occurs As a Prefix of Any Word in a Sentence	Two Pointers, String, String Matching	checkIfAWordOccursAsAPrefixOfAnyWordInASentence.ts
1346. Check If N and Its Double Exist	Array, Hash Table, Two Pointers, Binary Search, Sorting	checkIfNAndItsDoubleExist.ts
2490. Circular Sentence	String	circularSentence.ts
70. Climbing Stairs	Math, Dynamic Programming, Memoization	climbingStairs.ts
2022. Convert 1D Array Into 2D Array	Array, Matrix, Simulation	convert1DArrayInto2DArray.ts
3005. Count Elements With Maximum Frequency	Array, Hash Table, Counting	countElementMaxFrequency.ts
2185. Counting Words With a Given Prefix	Array, String, String Matching	countingWordsWithAGivenPrefix.ts
3042. Count Prefix and Suffix Pairs I	Array, String, Trie, Rolling Hash, String Matching, Hash Function	countPrefixAndSuffixPairsI.ts
1684. Count the Number of Consistent Strings	Array, Hash Table, String, Bit Manipulation, Counting	countTheNumberOfConsistentStrings.ts
1598. Crawler Log Folder	Array, String, Stack	crawlerLogFolder.ts
1957. Delete Characters to Make Fancy String	String	deleteCharactersToMakeFancyString.ts
2331. Evaluate Boolean Binary Tree	Tree, Depth-First Search, Binary Tree	evaluateBooleanBinaryTree.ts
509. Fibonacci Number	Math, Dynamic Programming, Recursion, Memoization	fibonacciNumber.ts
1791. Find Center of Star Graph	Graph	findCenterOfStarGraph.ts
1002. Find Common Characters	Array, Hash Table, String	findCommonCharacters.ts
2485. Find the Pivot Integer	Math, Prefix Sum	findThePivotInteger.ts
412. Fizz Buzz	Math, String, Manipulation	fizzBuzz.ts
1051. Height Checker	Array, Sorting, Counting Sort	heightChecker.ts
350. Intersection of Two Arrays II	Array, Hash Table, Two Pointers, Binary Search, Sorting	intersectionOfTwoArraysII.ts
463. Island Perimeter	Array, Depth-First Search, Breadth-First Search, Matrix	islandPerimeter.ts
2053. Kth Distinct String in an Array	Array, Hash Table, String, Counting	kthDistinctStringInAnArray.ts
703. Kth Largest Element in a Stream	Tree, Design, Binary Search Tree, Heap (Priority Queue), Binary Tree, Data Stream	kthLargestElementInAStream.ts
2373. Largest Local Values in a Matrix	Array, Matrix	largestLocalValuesInAMatrix.ts
2441. Largest Positive Integer That Exists With Its Negative	Array, Hash Table, Two Pointers, Sorting	largestPositiveIntegerThatExistsWithItsNegative.ts
860. Lemonade Change	Array, Greedy	lemonadeChange.ts
141. Linked List Cycle	Hash Table, Linked List, Two Pointers	linkedListCycle.ts
14. Longest Common Prefix	String, Trie	longestCommonPrefix.ts
409. Longest Palindrome	Hash Table, String, Greedy	longestPalindrome.ts
1380. Lucky Numbers in a Matrix	Array, Matrix	luckyNumbersInAMatrix.ts
1460. Make Two Arrays Equal by Reversing Subarrays	Array, Hash Table, Sorting	makeTwoArraysEqualByReversingSubarrays.ts
1422. Maximum Score After Splitting a String	String, Prefix Sum	maximumScoreAfterSplittingAString.ts
88. Merge Sorted Array	Array, Two Pointers, Sorting	mergeSortedArray.ts
876. Middle of the Linked List	Linked List, Two Pointers	middleOfLinkedList.ts
2037. Minimum Number of Moves to Seat Everyone	Array, Greedy, Sorting, Counting Sort	minimumNumberOfMovesToSeatEveryone.ts
2696. Minimum String Length After Removing Substrings	String, Stack, Simulation	minimumStringLengthAfterRemovingSubstrings.ts
590. N-ary Tree Postorder Traversal	Stack, Tree, Depth-First Search	n-aryTreePostorderTraversal.ts
476. Number Complement	Bit Manipulation	numberComplement.ts
191. Number of 1 Bits	Divide and Conquer, Bit Manipulation	numberOf1Bits.ts
2678. Number of Senior Citizens	Array, String	numberOfSeniorCitizens.ts
2582. Pass the Pillow	Math, Simulation	passThePillow.ts
326. Power of Three	Math, Recursion	powerOfThree.ts
303. Range Sum Query - Immutable	Array, Design, Prefix Sum	rangeSumQueryImmutable.ts
1331. Rank Transform of an Array	Array, Hash Table, Sorting	rankTransformOfAnArray.ts
506. Relative Ranks	Array, Sorting, Heap (Priority Queue)	relativeRanks.ts
1122. Relative Sort Array	Array, Hash Table, Sorting, Counting Sort	relativeSortArray.ts
26. Remove Duplicates from Sorted Array	Array, Two Pointers	removeDuplicatesFromSortedArray.ts
27. Remove Element	Array, Two Pointers	removeElement.ts
206. Reverse Linked List	Linked List, Recursion	reverseLinkedList.ts
2000. Reverse Prefix of Word	Two Pointers, String, Stack	reversePrefixOfWord.ts
344. Reverse String	Two Pointers, String	reverseString.ts
796. Rotate String	String, String Matching	rotateString.ts
3110. Score of a String	String	scoreOfAString.ts
1636. Sort Array by Increasing Frequency	Array, Hash Table, Sorting	sortArrayByIncreasingFrequency.ts
2418. Sort the People	Array, Hash Table, String, Sorting	sortThePeople.ts
1608. Special Array With X Elements Greater Than or Equal X	Array, Binary Search, Sorting	specialArrayWithXElementsGreaterThanOrEqualX.ts
1408. String Matching in an Array	Array, String, String Matching	stringMatchingInAnArray.ts
1863. Sum of All Subset XOR Totals	Array, Math, Backtracking, Bit Manipulation, Combinatorics, Enumeration	sumOfAllSubsetsXORTotals.ts
1945. Sum of Digits of String After Convert	String, Simulation	sumOfDigitsOfStringAfterConvert.ts
1550. Three Consecutive Odds	Array	threeConsecutiveOdds.ts
1. Two Sum	Array, Hash Table	twoSum.ts
884. Uncommon Words from Two Sentences	Hash Table, String, Counting	uncommonWordsFromTwoSentences.ts
242. Valid Anagram	Hash Table, String, Counting	https://leetcode.com/problems/valid-anagram/description/
125. Valid Palindrome	Two Pointers, String	validPalindrome.ts
1518. Water Bottles	Math, Simulation	waterBottles.ts
3151. Special Array I	Array	specialArrayI.ts
1752. Check if Array Is Sorted and Rotated	Array	checkIfArrayIsSortedAndRotated.ts
3105. Longest Strictly Increasing or Strictly Decreasing Subarray	Array	longestStrictlyIncreasingOrStrictlyDecreasingSubarray.ts
1800. Maximum Ascending Subarray Sum	Array	maximumAscendingSubarraySum.ts
1790. Check if One String Swap Can Make Strings Equal	Hash Table, String, Counting	checkIfOneStringSwapCanMakeStringsEqual.ts
3174. Clear Digits	String, Stack, Simulation	clearDigits.ts
2460. Apply Operations to an Array	Array, Two Pointers, Simulation	applyOperationsToAnArray.ts
1475. Final Prices With a Special Discount in a Shop	Array, Stack, Monotonic Stack	finalPricesWithASpecialDiscountInAShop.ts
2570. Merge Two 2D Arrays by Summing Values	Array, Hash Table, Two Pointers	mergeTwo2DArraysBySummingValues.ts
2558. Take Gifts From the Richest Pile	Array. Heap (Priority Queue). Simulation	takeGiftsFromTheRichestPile.ts
2965. Find Missing and Repeated Values	Array, Hash Table, Math, Matrix	findMissingAndRepeatedValues.ts
2379. Minimum Recolors to Get K Consecutive Black Blocks	String, Sliding Window	minimumRecolorsToGetKConsecutiveBlackBlocks.ts
2529. Maximum Count of Positive Integer and Negative Integer	Array, Binary Search, Counting	maximumCountOfPositiveIntegerAndNegativeInteger.ts
2206. Divide Array Into Equal Pairs	Array, Hash Table, Bit Manipulation, Counting	divideArrayIntoEqualPairs.ts
2873. Maximum Value of an Ordered Triplet I	Array	maximumValueOfAnOrderedTripletI.ts
3396. Minimum Number of Operations to Make Elements in Array Distinct	Array, Hash Table	minimumNumberOfOperationsToMakeElementsInArrayDistinct.ts
3375. Minimum Operations to Make Array Values Equal to K	Array, Hash Table	minimumOperationsToMakeArrayValuesEqualToK.ts
2843. Count Symmetric Integers	Math, Enumeration	countSymmetricIntegers.ts
2176. Count Equal and Divisible Pairs in an Array	Array	countEqualAndDivisiblePairsInAnArray.ts
1399. Count Largest Group	Hash Table, Math	countLargestGroup.ts
3392. Count Subarrays of Length Three With a Condition	Array	countSubarraysOfLengthThreeWithACondition.ts
1295. Find Numbers with Even Number of Digits	Array, Math	findNumbersWithEvenNumberOfDigits.ts
1128. Number of Equivalent Domino Pairs	Array, Hash Table, Counting	numberOfEquivalentDominoPairs.ts
1920. Build Array from Permutation	Array, Simulation	buildArrayFromPermutation.ts
2094. Finding 3-Digit Even Numbers	Array, Hash Table, Sorting, Enumeration	finding3-DigitEvenNumbers.ts
2900. Longest Unequal Adjacent Groups Subsequence I	Array, String, Dynamic Programming, Greedy	longestUnequalAdjacentGroupsSubsequenceI.ts
3024. Type of Triangle	Array, Math, Sorting	typeOfTriangle.ts
2894. Divisible and Non-divisible Sums Difference	Math	divisibleAndNonDivisibleSumsDifference.ts
2942. Find Words Containing Character	Array, String	findWordsContainingCharacter.ts
3442. Maximum Difference Between Even and Odd Frequency I	Hash Table, String, Counting	maximumDifferenceBetweenEvenAndOddFrequencyI.ts
3423. Maximum Difference Between Adjacent Elements in a Circular Array	Array	maximumDifferenceBetweenAdjacentElementsInACircularArray.ts
2016. Maximum Difference Between Increasing Elements	Array	maximumDifferenceBetweenIncreasingElements.ts
2566. Maximum Difference by Remapping a Digit	Math, Greedy	maximumDifferenceByRemappingADigit.ts
2138. Divide a String Into Groups of Size k	String, Simulation	divideAStringIntoGroupsOfSizeK.ts
2200. Find All K-Distant Indices in an Array	Array, Two Pointers	findAllKDistantIndicesInAnArray.ts
2099. Find Subsequence of Length K With the Largest Sum	Array, Hash Table, Sorting, Heap (Priority Queue)
594. Longest Harmonious Subsequence	Array, Hash Table, Sliding Window, Sorting, Counting	longestHarmoniousSubsequence.ts

Medium Problems

Challenge Name	Topics	File
650. 2 Keys Keyboard	Math, Dynamic Programming	2KeysKeyboard.ts
2109. Adding Spaces to a String	Array, Two Pointers, String, Simulation	addingSpacesToAString.ts
623. Add One Row to Tree	Tree, Depth-First Search, Breadth-First Search, Binary Tree	addOneRowToTree.ts
2486. Append Characters to String to Make Subsequence	Two Pointers, String, Greedy	appendCharactersToStringToMakeSubsequence.ts
1701. Average Waiting Time	Array, Simulation	averageWaitingTime.ts
948. Bag of Tokens	Array, Two Pointers, Greedy, Sorting	bagOfTokens.ts
1382. Balance a Binary Search Tree	Divide and Conquer, Greedy, Tree, Depth-First Search, Binary Search Tree, Binary Tree	balanceABinarySearchTree.ts
1014. Best Sightseeing Pair	Array, Dynamic Programming	bestSightseeingPair.ts
1038. Binary Search Tree to Greater Sum Tree	Tree, Depth-First Search, Binary Search Tree, Binary Tree	binarySearchTreeToGreaterSumTree.ts
2425. Bitwise XOR of All Pairings	Array, Bit Manipulation, Brainteaser	bitwiseXOROfAllPairings.ts
881. Boats to Save People	Array, Two Pointers, Greedy, Sorting	boatsToSavePeople.ts
2116. Check if a Parentheses String Can Be Valid	String, Stack, Greedy	checkIfAParenthesesStringCanBeValid.ts
1497. Check If Array Pairs Are Divisible by k	Array, Hash Table, Counting	checkIfArrayPairsAreDivisibleByK.ts
40. Combination Sum II	Array, Backtracking	combinationSumII.ts
165. Compare Version Numbers	Two Pointers, String	compareVersionNumbers.ts
1400. Construct K Palindrome Strings	Hash Table, String, Greedy, Counting	constructKPalindromeStrings.ts
523. Continuous Subarray Sum	Array, Hash Table, Math, Prefix Sum	continuousSubarraySum.ts
2044. Count Number of Maximum Bitwise-OR Subsets	Array, Backtracking, Bit Manipulation, Enumeration	countNumberOfMaximumBitwise-ORSubsets.ts
1248. Count Number of Nice Subarrays	Array, Hash Table, Math, Sliding Window, Prefix Sum	countNumberOfNiceSubarrays.ts
1395. Count Number of Teams	Array, Dynamic Programming, Binary Indexed Tree, Segment Tree	countNumberOfTeams.ts
1267. Count Servers that Communicate	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix, Counting	countServersThatCommunicate.ts
2563. Count the Number of Fair Pairs	Array, Two Pointers, Binary Search, Sorting	countTheNumberOfFairPairs.ts
1442. Count Triplets That Can Form Two Arrays of Equal XOR	Array, Hash Table, Math, Bit Manipulation, Prefix Sum	countTripletsThatCanFormTwoArraysOfEqualXOR.ts
2257. Count Unguarded Cells in the Grid	Array, Matrix, Simulation	countUnguardedCellsInTheGrid.ts
2559. Count Vowel Strings in Ranges	Array, String, Prefix Sum	countVowelStringsInRanges.ts
2466. Count Ways To Build Good Strings	Dynamic Programming	countWaysToBuildGoodStrings.ts
1462. Course Schedule IV	Depth-First Search, Breadth-First Search, Graph, Topological Sort	courseScheduleIV.ts
2641. Cousins in Binary Tree II	Hash Table, Tree, Depth-First Search, Breadth-First Search, Binary Tree	cousinsInBinaryTreeII.ts
2196. Create Binary Tree From Descriptions	Array, Hash Table, Tree, Binary Tree	createBinaryTreeFromDescriptions.ts
791. Custom Sort String	Hash Table, String, Sorting	customSortString.ts
1325. Delete Leaves With a Given Value	Tree, Depth-First Search, Binary Tree	deleteLeavesWithAGivenValue.ts
237. Delete Node in a Linked List	Linked List	deleteNodeInALinkedList.ts
1110. Delete Nodes And Return Forest	Array, Hash Table, Tree, Depth-First Search, Binary Tree	deleteNodesAndReturnForest.ts
3217. Delete Nodes From Linked List Present in Array	Array, Hash Table, Linked List	deleteNodesFromLinkedListPresentInArray.ts
1381. Design a Stack With Increment Operation	Array, Stack, Design	designAStackWithIncrementOperation.ts
241. Different Ways to Add Parentheses	Math, String, Dynamic Programming, Recursion, Memoization	differentWaysToAddParentheses.ts
979. Distribute Coins in Binary Tree	Tree, Depth-First Search, Binary Tree	distributeCoinsInBinaryTree.ts
2406. Divide Intervals Into Minimum Number of Groups	Array, Two Pointers, Greedy, Sorting, Heap (Priority Queue), Prefix Sum	divideIntervalsIntoMinimumNumberOfGroups.ts
2816. Double a Number Represented as a Linked List	Linked List, Math, Stack	doubleANumberRepresentedAsALinkedList.ts
2707. Extra Characters in a String	Array, Hash Table, String, Dynamic Programming, Trie	extraCharactersInAString.ts
1992. Find All Groups of Farmland	Array, Depth-First Search, Breadth-First Search, Matrix	findAllGroupsOfFarmland.ts
442. Find All Duplicates in an Array	Array, Hash Table	findAllTheDuplicatesInAnArray.ts
2924. Find Champion II	Graph	findChampionII.ts
3011. Find if Array Can Be Sorted	Array, Bit Manipulation, Sorting	findIfArrayCanBeSorted.ts
515. Find Largest Value in Each Tree Row	Tree, Depth-First Search, Breadth-First Search, Binary Tree	findLargestValueInEachTreeRow.ts
2028. Find Missing Observations	Array, Math, Simulation	findMissingObservations.ts
1334. Find the City With the Smallest Number of Neighbors at a Threshold Distance	Dynamic Programming. Graph. Shortest Path	findTheCityWithTheSmallestNumberOfNeighborsAtAThresholdDistance.ts
3043. Find the Length of the Longest Common Prefix	Array, Hash Table, String, Trie	findTheLengthOfTheLongestCommonPrefix.ts
2058. Find the Minimum and Maximum Number of Nodes Between Critical Points	Linked List	findTheMinimumAndMaximumNumberOfNodesBetweenCriticalPoints.ts
2657. Find the Prefix Common Array of Two Arrays	Array, Hash Table, Bit Manipulation	findThePrefixCommonArrayOfTwoArrays.ts
2812. Find the Safest Path in a Grid	Array, Binary Search, Breadth-First Search, Union Find, Heap (Priority Queue), Matrix	findTheSafestPathInAGrid.ts
1894. Find the Student that Will Replace the Chalk	Array, Binary Search, Simulation, Prefix Sum	findTheStudentThatWillReplaceTheChalk.ts
1823. Find the Winner of the Circular Game	Array, Math, Recursion, Queue, Simulation	findTheWinnerOfTheCircularGame.ts
1605. Find Valid Matrix Given Row and Column Sums	Array, Greedy, Matrix	findValidMatrixGivenRowAndColumnSums.ts
2661. First Completely Painted Row or Column	Array, Hash Table, Matrix	firstCompletelyPaintedRowOrColumn.ts
951. Flip Equivalent Binary Trees	Tree, Depth-First Search, Binary Tree	flipEquivalentBinaryTrees.ts
1208. Get Equal Substrings Within Budget	String, Binary Search, Sliding Window, Prefix Sum	getEqualSubstringsWithinBudget.ts
2017. Grid Game	Array, Matrix, Prefix Sum	gridGame.ts
1052. Grumpy Bookstore Owner	Array, Sliding Window	grumpyBookstoreOwner.ts
846. Hand of Straights	Array, Hash Table, Greedy, Sorting	handOfStraights.ts
2807. Insert Greatest Common Divisors in Linked List	Linked List, Math, Number Theory	insertGreatestCommonDivisorsInLinkedList.ts
2583. Kth Largest Sum in a Binary Tree	Tree, Breadth-First Search, Sorting, Binary Tree	kthLargestSumInABinaryTree.ts
179. Largest Number	Array, String, Greedy, Sorting	largestNumber.ts
2958. Length of Longest Subarray With at Most K Frequency	Array, Hash Table, Sliding Window	lengthOfLongestSubarrayWithAtMostKFrequency.ts
386. Lexicographical Numbers	Depth-First Search, Trie	lexicographicalNumbers.ts
1367. Linked List in Binary Tree	Linked List, Tree, Depth-First Search, Binary Tree	linkedListIinBinaryTree.ts
1438. Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Array, Queue, Sliding Window, Heap (Priority Queue), Ordered Set, Monotonic Queue	longestContinuousSubarrayWithAbsoluteDiffLessThanOrEqualToLimit.ts
1405. Longest Happy String	String, Greedy, Heap (Priority Queue)	longestHappyString.ts
1552. Magnetic Force Between Two Balls	Array, Binary Search, Sorting	magneticForceBetweenTwoBalls.ts
2825. Make String a Subsequence Using Cyclic Increments	Two Pointers, String	makeStringASubsequenceUsingCyclicIncrements.ts
1765. Map of Highest Peak	Array, Breadth-First Search, Matrix	mapOfHighestPeak.ts
769. Max Chunks To Make Sorted	Array, Stack, Greedy, Sorting, Monotonic Stack	maxChunksToMakeSorted.ts
2530. Maximal Score After Applying K Operations	Array, Greedy, Heap (Priority Queue)	maximalScoreAfterApplyingKOperations.ts
3075. Maximize Happiness of Selected Children	Array, Greedy, Sorting	maximizeHappinessOfSelectedChildren.ts
1792. Maximum Average Pass Ratio	Array, Greedy, Heap (Priority Queue)	maximumAveragePassRatio.ts
624. Maximum Distance in Arrays	Array, Greedy	maximumDistanceInArrays.ts
2554. Maximum Number of Integers to Choose From a Range I	Array, Hash Table, Binary Search, Greedy, Sorting	maximumNumberOfIntegersToChooseFromARangeI.ts
1937. Maximum Number of Points with Cost	Array, Dynamic Programming, Matrix	maximumNumberOfPointsWithCost.ts
670. Maximum Swap	Math, Greedy	maximumSwap.ts
2285. Maximum Total Importance of Roads	Greedy, Graph, Sorting, Heap (Priority Queue)	maximumTotalImportanceOfRoads.ts
1829. Maximum XOR for Each Query	Array, Bit Manipulation, Prefix Sum	maximumXORForEachQuery.ts
1669. Merge In Between Linked Lists	Linked List	mergeInBetweenLinkedLists.ts
2181. Merge Nodes in Between Zeros	Linked List, Simulation	mergeNodesInBetweenZeros.ts
2429. Minimize XOR	Greedy, Bit Manipulation	minimizeXOR.ts
983. Minimum Cost For Tickets	Array, Dynamic Programming	minimumCostForTickets.ts
1653. Minimum Deletions to Make String Balanced	String, Dynamic Programming, Stack	minimumDeletionsToMakeStringBalanced.ts
1509. Minimum Difference Between Largest and Smallest Value in Three Moves	Array, Greedy, Sorting	minimumDifferenceBetweenLargestAndSmallestValueInThreeMoves.ts
945. Minimum Increment to Make Array Unique	Array, Greedy, Sorting, Counting	minimumIncrementToMakeArrayUnique.ts
1750. Minimum Length of String After Deleting Similar Ends	Two Pointers, String	minimumLengthOfStringAfterDeletingSimilarEnds.ts
3223. Minimum Length of String After Operations	Hash Table, String, Counting	minimumLengthOfStringAfterOperations.ts
2914. Minimum Number of Changes to Make Binary String Beautiful	String	minimumNumberOfChangesToMakeBinaryStringBeautiful.ts
1482. Minimum Number of Days to Make m Bouquets	Array, Binary Search	minimumNumberOfDaysToMakeMBouquets.ts
1769. Minimum Number of Operations to Move All Balls to Each Box	Array, String, Prefix Sum	minimumNumberOfOperationsToMoveAllBallsToEachBox.ts
2471. Minimum Number of Operations to Sort a Binary Tree by Level	Tree, Breadth-First Search, Binary Tree	minimumNumberOfOperationsToSortABinaryTreeByLevel.ts
3016. Minimum Number of Pushes to Type Word II	Hash Table, String, Greedy, Sorting, Counting	minimumNumberOfPushesToTypeWordII.ts
2134. Minimum Swaps to Group All 1's Together II	Array, Sliding Window	minimumSwapsToGroupAll1sTogetherII.ts
539. Minimum Time Difference	Array, Math, String, Sorting	minimumTimeDifference.ts
826. Most Profit Assigning Work	Array, Two Pointers, Binary Search, Greedy, Sorting	mostProfitAssigningWork.ts
2337. Move Pieces to Obtain a String	Two Pointers, String	movePiecesToObtainAString.ts
729. My Calendar I	Array, Binary Search, Design, Segment Tree, Ordered Set	myCalendarI.ts
2683. Neighboring Bitwise XOR	Array, Bit Manipulation	neighboringBitwiseXOR.ts
1530. Number of Good Leaf Nodes Pairs	Tree, Depth-First Search, Binary Tree	numberOfGoodLeafNodesPairs.ts
200. Number of Islands	Array, Depth-First Search, Breadth-First Search, Union Find, Matrix	numberOfIslands.ts
1404. Number of Steps to Reduce a Number in Binary Representation to One	String, Bit Manipulation	numberOfStepsToReduceANumberInBinaryRepresentationToOne.ts
2270. Number of Ways to Split Array	Array, Prefix Sum	numberOfWaysToSplitArray.ts
131. Palindrome Partitioning	String, Dynamic Programming, Backtracking	palindromePartitioning.ts
1219. Path with Maximum Gold	Array, Backtracking, Matrix	pathWithMaximumGold.ts
567. Permutation in String	Hash Table, Two Pointers, String, Sliding Window	permutationInString.ts
2601. Prime Subtraction Operation	Array, Math, Binary Search, Greedy, Number Theory	primeSubtractionOperation.ts
1508. Range Sum of Sorted Subarray Sums	Array, Two Pointers, Binary Search, Sorting	rangeSumOfSortedSubarraySums.ts
959. Regions Cut By Slashes	Array, Hash Table, Depth-First Search, Breadth-First Search, Union Find, Matrix	regionsCutBySlashes.ts
2487. Remove Nodes From Linked List	Linked List, Stack, Recursion, Monotonic Stack	removeNodesFromLinkedList.ts
648. Replace Words	Array, Hash Table, String, Trie	replaceWords.ts
2415. Reverse Odd Levels of Binary Tree	Tree, Depth-First Search, Breadth-First Search, Binary Tree	reverseOddLevelsOfBinaryTree.ts
861. Score After Flipping Matrix	Array, Greedy, Bit Manipulation, Matrix	scoreAfterFlippingMatrix.ts
1813. Sentence Similarity III	Array, Two Pointers, String	sentenceSimilarityIII.ts
2938. Separate Black and White Balls	Two Pointers, String, Greedy	separateBlackAndWhiteBalls.ts
2381. Shifting Letters II	Array, String, Prefix Sum	shiftingLettersII.ts
3097. Shortest Subarray With OR at Least K II	Array, Bit Manipulation, Sliding Window	shortestSubarrayWithORAtLeastKII.ts
260. Single Number III	Array, Bit Manipulation	singleNumberIII.ts
912. Sort an Array	Array, Divide and Conquer, Sorting, Heap (Priority Queue), Merge Sort, Bucket Sort, Radix Sort, Counting Sort	sortAnArray.ts
75. Sort Colors	Array, Two Pointers, Sorting	sortColors.ts
2191. Sort the Jumbled Numbers	Array, Sorting	sortTheJumbledNumbers.ts
885. Spiral Matrix III	Array, Matrix, Simulation	spiralMatrixIII.ts
2326. Spiral Matrix IV	Array, Linked List, Matrix, Simulation	spiralMatrixIV.ts
1593. Split a String Into the Max Number of Unique Substrings	Hash Table, String, Backtracking	splitAStringIntoTheMaxNumberOfUniqueSubstrings.ts
725. Split Linked List in Parts	Linked List	splitLinkedListInParts.ts
2096. Step-By-Step Directions From a Binary Tree Node to Another	String, Tree, Depth-First Search, Binary Tree	StepDirectionsFromABinaryTreeNodeToAnother.ts
3163. String Compression III	String	stringCompressionIII.ts
713. Subarray Product Less Than K	Array, Binary Search, Sliding Window, Prefix Sum	subarrayProductLessThanK.ts
974. Subarray Sums Divisible by K	Array, Hash Table, Prefix Sum	subarraySumsDivisibleByK.ts
78. Subsets	Array, Backtracking, Bit Manipulation	subsets.ts
633. Sum of Square Numbers	Math, Two Pointers, Binary Search	sumOfSquareNumbers.ts
129. Sum Root to Leaf Numbers	Tree, Depth-First Search, Binary Tree	sumRootToLeafNumbers.ts
494. Target Sum	Array, Dynamic Programming, Backtracking	targetSum.ts
2597. The Number of Beautiful Subsets	Array, Hash Table, Math, Dynamic Programming, Backtracking, Sorting, Combinatorics	theNumberOfBeautifulSubsets.ts
1942. The Number of the Smallest Unoccupied Chair	Array, Hash Table, Heap (Priority Queue)	theNumberOfTheSmallestUnoccupiedChair.ts
264. Ugly Number II	Hash Table, Math, Dynamic Programming, Heap (Priority Queue)	uglyNumberII.ts
1930. Unique Length-3 Palindromic Subsequences	Hash Table, String, Bit Manipulation, Prefix Sum	uniqueLength-3PalindromicSubsequences.ts
874. Walking Robot Simulation	Array, Hash Table, Simulation	walkingRobotSimulation.ts
916. Word Subsets	Array, Hash Table, String	wordSubsets.ts
1310. XOR Queries of a Subarray	Array, Bit Manipulation, Prefix Sum	xorQueriesOfASubarray.ts
1079. Letter Tile Possibilities	Hash Table, String, Backtracking, Counting	letterTilePossibilities.ts
1726. Tuple with Same Product	Array, Hash Table, Counting	tupleWithSameProduct.ts
3160. Find the Number of Distinct Colors Among the Balls	Array, Hash Table, Simulation	findTheNumberOfDistinctColorsAmongTheBalls.ts
2364. Count Number of Bad Pairs	Array, Hash Table, Math, Counting	countNumberOfBadPairs.ts
2349. Design a Number Container System	Hash Table, Design, Heap (Priority Queue), Ordered Set	designANumberContainerSystem.ts
1910. Remove All Occurrences of a Substring	String, Stack, Simulation	removeAllOccurrencesOfASubstring.ts
2342. Max Sum of a Pair With Equal Sum of Digits	Array, Hash Table, Sorting, Heap (Priority Queue)	maxSumOfAPairWithEqualSumOfDigits.ts
3066. Minimum Operations to Exceed Threshold Value II	Array, Heap (Priority Queue), Simulation	minimumOperationsToExceedThresholdValueII.ts
1352. Product of the Last K Numbers	Array, Math, Design, Data Stream, Prefix Sum	productOfTheLastKNumbers.ts
2698. Find the Punishment Number of an Integer	Math, Backtracking	findThePunishmentNumberOfAnInteger.ts
1718. Construct the Lexicographically Largest Valid Sequence	Array, Backtracking	constructTheLexicographicallyLargestValidSequence.ts
2375. Construct Smallest Number From DI String	String, Backtracking, Stack, Greedy	constructSmallestNumberFromDIString.ts
1415. The k-th Lexicographical String of All Happy Strings of Length n	String, Backtracking	theKthLexicographicalStringOfAllHappyStringsOfLengthN.ts
1980. Find Unique Binary String	Array, Hash Table, String, Backtracking	findUniqueBinaryString.ts
1261. Find Elements in a Contaminated Binary Tree	Hash Table, Tree, Depth-First Search, Breadth-First Search, Design, Binary Tree	findElementsInAContaminatedBinaryTree.ts
1524. Number of Sub-arrays With Odd Sum	Array, Math, Dynamic Programming, Prefix Sum	numberOfSubarraysWithOddSum.ts
2467. Most Profitable Path in a Tree	Array, Tree, Depth-First Search, Breadth-First Search, Graph	mostProfitablePathInATree.ts
889. Construct Binary Tree from Preorder and Postorder Traversal	Array, Hash Table, Divide and Conquer, Tree, Binary Tree	constructBinaryTreeFromPreorderAndPostorderTraversal.ts
873. Length of Longest Fibonacci Subsequence	Array, Hash Table, Dynamic Programming	lengthOfLongestFibonacciSubsequence.ts
1749. Maximum Absolute Sum of Any Subarray	Array, Dynamic Programming	maximumAbsoluteSumOfAnySubarray.ts
2593. Find Score of an Array After Marking All Elements	Array, Hash Table, Sorting, Heap (Priority Queue), Simulation	findScoreOfAnArrayAfterMarkingAllElements.ts
2161. Partition Array According to Given Pivot	Array. Two Pointers. Simulation	partitionArrayAccordingToGivenPivot.ts
1780. Check if Number is a Sum of Powers of Three	Math	checkIfNumberIsASumOfPowersOfThree.ts
2579. Count Total Number of Colored Cells	Math	countTotalNumberOfColoredCells.ts
2523. Closest Prime Numbers in Range	Math, Number Theory	closestPrimeNumbersInRange.ts
3208. Alternating Groups II	Array, Sliding Window	alternatingGroupsII.ts
3306. Count of Substrings Containing Every Vowel and K Consonants II	Hash Table, String, Sliding Window	countOfSubstringsContainingEveryVowelAndKConsonantsII.ts
1358. Number of Substrings Containing All Three Characters	Hash Table, String, Sliding Window	numberOfSubstringsContainingAllThreeCharacters.ts
3356. Zero Array Transformation II	Array, Binary Search, Prefix Sum	zeroArrayTransformationII.ts
2226. Maximum Candies Allocated to K Children	Array, Binary Search	maximumCandiesAllocatedToKChildren.ts
2560. House Robber IV	Arra, Binary Search	houseRobberIV.ts
2401. Longest Nice Subarray	Array, Bit Manipulation, Sliding Window	longestNiceSubarray.ts
3191. Minimum Operations to Make Binary Array Elements Equal to One I	Array, Bit Manipulation, Queue, Sliding Window, Prefix Sum	minimumOperationsToMakeBinaryArrayElementsEqualToOneI.ts
2115. Find All Possible Recipes from Given Supplies	Array, Hash Table, String, Graph, Topological Sort	findAllPossibleRecipesFromGivenSupplies.ts
3169. Count Days Without Meetings	Array, Sorting	countDaysWithoutMeetings.ts
3394. Check if Grid can be Cut into Sections	Array, Sorting	checkIfGridCanBeCutIntoSections.ts
2033. Minimum Operations to Make a Uni-Value Grid	Array, Math, Sorting, Matrix	minimumOperationsToMakeAUniValueGrid.ts
2780. Minimum Index of a Valid Split	Array, Hash Table, Sorting	minimumIndexOfAValidSplit.ts
2140. Solving Questions With Brainpower	Array, Dynamic Programming	solvingQuestionsWithBrainpower.ts
2874. Maximum Value of an Ordered Triplet II	Array	maximumValueOfAnOrderedTripletII.ts
368. Largest Divisible Subset	Array, Math, Dynamic Programming, Sorting	largestDivisibleSubset.ts
416. Partition Equal Subset Sum	Array, Dynamic Programming	partitionEqualSubsetSum.ts
1922. Count Good Numbers	Math, Recursion	countGoodNumbers.ts
2070. Most Beautiful Item for Each Query	Array, Binary Search, Sorting	mostBeautifulItemForEachQuery.ts
2537. Count the Number of Good Subarrays	Array, Hash Table, Sliding Window	countTheNumberOfGoodSubarrays.ts
2145. Count the Hidden Sequences	Array, Prefix Sum	countTheHiddenSequences.ts
38. Count and Say	String	countAndSay.ts
781. Rabbits in Forest	Array, Hash Table, Math, Greedy	rabbitsInForest.ts
2145. Count the Hidden Sequences	Array, Prefix Sum	countTheHiddenSequences.ts
2799. Count Complete Subarrays in an Array	Array, Hash Table, Sliding Window	countCompleteSubarraysInAnArray.ts
2845. Count of Interesting Subarrays	Array, Hash Table, Prefix Sum	countOfInterestingSubarrays.ts
2962. Count Subarrays Where Max Element Appears at Least K Times	Array, Sliding Window	countSubarraysWhereMaxElementAppearsAtLeastKTimes.ts
1007. Minimum Domino Rotations For Equal Row	Array, Greedy	minimumDominoRotationsForEqualRow.ts
790. Domino and Tromino Tiling	Dynamic Programming
3341. Find Minimum Time to Reach Last Room I	Array, Graph, Heap (Priority Queue), Matrix, Shortest Path	findMinimumTimeToReachLastRoomI.ts
3342. Find Minimum Time to Reach Last Room II	Array, Graph, Heap (Priority Queue), Matrix, Shortest Path	findMinimumTimeToReachLastRoomII.ts
3335. Total Characters in String After Transformations I	Hash Table, Math, String, Dynamic Programming, Counting	totalCharactersInStringAfterTransformationsI.ts
3355. Zero Array Transformation I	Array, Prefix Sum	zeroArrayTransformationI.ts
73. Set Matrix Zeroes	Array, Hash Table, Matrix	setMatrixZeroes.ts
2131. Longest Palindrome by Concatenating Two Letter Words	Array, Hash Table, String, Greedy, Counting	longestPalindromeByConcatenatingTwoLetterWords.ts
3372. Maximize the Number of Target Nodes After Connecting Trees I	Tree, Depth-First Search, Breadth-First Search	maximizeTheNumberOfTargetNodesAfterConnectingTreesI.ts
3403. Find the Lexicographically Largest String From the Box I	Two Pointers, String, Enumeration	findTheLexicographicallyLargestStringFromTheBoxI.ts
3403. Find the Lexicographically Largest String From the Box I	Two Pointers, String, Enumeration	findTheLexicographicallyLargestStringFromTheBoxI.ts
1061. Lexicographically Smallest Equivalent String	String, Union Find	lexicographicallySmallestEquivalentString.ts
2434. Using a Robot to Print the Lexicographically Smallest String	Hash Table, String, Stack, Greedy	usingARobotToPrintTheLexicographicallySmallestString.ts
3170. Lexicographically Minimum String After Removing Stars	Hash Table, String, Stack, Greedy, Heap (Priority Queue)	lexicographicallyMinimumStringAfterRemovingStars.ts
1432. Max Difference You Can Get From Changing an Integer	Math, Greedy	maxDifferenceYouCanGetFromChangingAnInteger.ts
2966. Divide Array Into Arrays With Max Difference	Array, Greedy, Sorting	divideArrayIntoArraysWithMaxDifference.ts
2294. Partition Array Such That Maximum Difference Is K	Array, Greedy, Sorting	partitionArraySuchThatMaximumDifferenceIsK.ts
3085. Minimum Deletions to Make String K-Special	Hash Table, String, Greedy, Sorting, Counting	minimumDeletionsToMakeStringKSpecial.ts
2311. Longest Binary Subsequence Less Than or Equal to K	String, Dynamic Programming, Greedy, Memoization	longestBinarySubsequenceLessThanOrEqualToK.ts
1498. Number of Subsequences That Satisfy the Given Sum Condition	Array, Two Pointers, Binary Search, Sorting	numberOfSubsequencesThatSatisfyTheGivenSumCondition.ts

Hard Problems

Challenge Name	Topics	File
689. Maximum Sum of 3 Non-Overlapping Subarrays	Array, Dynamic Programming	maximumSumOf3NonOverlappingSubarrays.ts
1368. Minimum Cost to Make at Least One Valid Path in a Grid	Array, Breadth-First Search, Graph, Heap (Priority Queue), Matrix, Shortest Path	minimumCostToMakeAtLeastOneValidPathInAGrid.ts
995. Minimum Number of K Consecutive Bit Flips	Array, Bit Manipulation, Queue, Sliding Window, Prefix Sum	minimumNumberOfKConsecutivesBitFlips.ts
2290. Minimum Obstacle Removal to Reach Corner	Array, Breadth-First Search, Graph, Heap (Priority Queue), Matrix, Shortest Path	minimumObstacleRemovalToReachCorner.ts
2577. Minimum Time to Visit a Cell In a Grid	Array, Breadth-First Search, Graph, Heap (Priority Queue), Matrix, Shortest Path	minimumTimeToVisitACellInAGrid.ts
1106. Parsing A Boolean Expression	String, Stack, Recursion	parsingABooleanExpression.ts
1579. Remove Max Number of Edges to Keep Graph Fully Traversable	Union Find, Graph	removeMaxNumberOfEdgesToKeepGraphFullyTraversable.ts
214. Shortest Palindrome	String, Rolling Hash, String Matching, Hash Function	shortestPalindrome.ts
632. Smallest Range Covering Elements from K Lists	Array, Hash Table, Greedy, Sliding Window, Sorting, Heap (Priority Queue)	smallestRangeCoveringElementsFromKListsSolvedHardTopicsCompanies.ts
2416. Sum of Prefix Scores of Strings	Array, String, Trie, Counting	sumOfPrefixScoresOfStrings.ts
42. Trapping Rain Water	Array, Two Pointers, Dynamic Programming, Stack, Monotonic Stack	trappingRainWater.ts
140. Word Break II	Array, Hash Table, String, Dynamic Programming, Backtracking, Trie, Memoization	wordBreakII.ts
432. All O`one Data Structure	Hash Table, Linked List, Design, Doubly-Linked List	allO`oneDataStructure.ts
2392. Build a Matrix With Conditions	Array, Graph, Topological Sort, Matrix	buildAMatrixWithConditions.ts
719. Find K-th Smallest Pair Distance	Array, Two Pointers, Binary Search, Sorting	findKthSmallestPairDistance.ts
564. Find the Closest Palindrome	Math, String	findTheClosestPalindrome.ts
3068. Find the Maximum Sum of Node Values	Array, Dynamic Programming, Greedy, Bit Manipulation, Tree, Sorting	findTheMaximumSumOfNodeValues.ts
273. Integer to English Words	Math, String, Recursion	integerToEnglishWords.ts
502. IPO	Array, Greedy, Sorting, Heap (Priority Queue)	IPO.ts
440. K-th Smallest in Lexicographical Order	Trie	k-thSmallestInLexicographicalOrder.ts
1255. Maximum Score Words Formed by Letters	Array, String, Dynamic Programming, Backtracking, Bit Manipulation, Bitmask	maximumScoreWordsFormedByLetters.ts
2493. Divide Nodes Into the Maximum Number of Groups	Breadth-First Search, Union Find, Graph	divideNodesIntoTheMaximumNumberOfGroups.ts
1028. Recover a Tree From Preorder Traversal	String, Tree, Depth-First Search, Binary Tree	recoverATreeFromPreorderTraversal.ts
1092. Shortest Common Supersequence	String, Dynamic Programming	shortestCommonSupersequence.ts
3108. Minimum Cost Walk in Weighted Graph	Array, Bit Manipulation, Union Find, Graph	minimumCostWalkInWeightedGraph.ts
2503. Maximum Number of Points From Grid Queries	Array, Two Pointers, Breadth-First Search, Union Find, Sorting, Heap (Priority Queue), Matrix	maximumNumberOfPointsFromGridQueries.ts
2551. Put Marbles in Bags	Array, Greedy, Sorting, Heap (Priority Queue)	putMarblesInBags.ts
2999. Count the Number of Powerful Integers	Math, String, Dynamic Programming	countTheNumberOfPowerfulIntegers.ts
2179. Count Good Triplets in an Array	Array, Binary Search, Divide and Conquer, Binary Indexed Tree, Segment Tree, Merge Sort, Ordered Set	countGoodTripletsInAnArray.ts
2338. Count the Number of Ideal Arrays	Math, Dynamic Programming, Combinatorics, Number Theory	countTheNumberOfIdealArrays.ts
2444. Count Subarrays With Fixed Bounds	Array, Queue, Sliding Window, Monotonic Queue	countSubarraysWithFixedBounds.ts
2302. Count Subarrays With Score Less Than K	Array, Binary Search, Sliding Window, Prefix Sum	countSubarraysWithScoreLessThanK.ts
3337. Total Characters in String After Transformations II	Hash Table, Math, String, Dynamic Programming, Counting	totalCharactersInStringAfterTransformationsII.ts
3373. Maximize the Number of Target Nodes After Connecting Trees II	Tree, Depth-First Search, Breadth-First Search	maximizeTheNumberOfTargetNodesAfterConnectingTreesII.ts
135. Candy	Array, Greedy	candy.ts
1298. Maximum Candies You Can Get from Boxes	Array, Breadth-First Search, Graph	maximumCandiesYouCanGetFromBoxes.ts
2040. Kth Smallest Product of Two Sorted Arrays	Array, Binary Search	kthSmallestProductOfTwoSortedArrays.ts