jerrycychen / algoexpert

Leveling up my coding skills by solving data structure and algorithm questions in Java & Kotlin

algoexpert

⚡ LIST OF PROBLEMS

⭐ : Coding Interview Problems

Difficulty chart:

🟩 : Easy
🟦 : Medium
🟥 : Hard
⬛ : Very Hard

	Problem Statement	Difficulty	Java Solution	Kotlin Solution
⭐	Two Number Sum	🟩	TwoNumberSum.java	TwoNumberSum.kt
⭐	Validate Subsequence	🟩	ValidateSubsequence.java	ValidateSubsequence.kt
⭐	Sorted Squared Array	🟩	SortedSquaredArray.java	SortedSquaredArray.kt
⭐	Tournament Winner	🟩	TournamentWinner.java	TournamentWinner.kt
⭐	Non-Constructible Change	🟩	NonConstructibleChange.java	NonConstructibleChange.kt
⭐	Find Closest Value In BST	🟩	FindCloserValueInBstRecursive.java	FindCloserValueInBstRecursive.kt
⭐	Branch Sums	🟩	BranchSums.java	BranchSums.kt
⭐	Node Depths	🟩	NodeDepthsRecursive.java	NodeDepthsRecursive.kt
⭐	Depth-first Search	🟩	DepthFirstSearch.java	DepthFirstSearch.kt
⭐	Minimum Waiting Time	🟩	MinimumWaitingTime.java	MinimumWaitingTime.kt
⭐	Class Photos	🟩	ClassPhotos.java	ClassPhotos.kt
⭐	Tandem Bicycle	🟩	TandemBicycle.java	TandemBicycle.kt
⭐	Remove Duplicates From Linked List	🟩	RemoveDuplicatesFromLinkedList.java	RemoveDuplicatesFromLinkedList.kt
⭐	Nth Fibonacci	🟩	NthFibonacciOnO1.java	NthFibonacciOnO1.kt
⭐	Product Sum	🟩	ProductSum.java	ProductSum.kt
⭐	Binary Search	🟩	BinarySearchIterative.java	BinarySearchIterative.kt
⭐	Find Three Largest Numbers	🟩	FindThreeLargestNumbers.java	FindThreeLargestNumbers.kt
⭐	Bubble Sort	🟩	BubbleSort.java	BubbleSort.kt
⭐	Insertion Sort	🟩	InsertionSort.java	InsertionSort.kt
⭐	Selection Sort	🟩	SelectionSort.java	SelectionSort.kt
⭐	Palindrome Check	🟩	PalindromeCheckOnO1.java	PalindromeCheckOnO1.kt
⭐	Caesar Cipher Encryptor	🟩	CaesarCipherEncryptorAlphabet.java	CaesarCipherEncryptorAlphabet.kt
⭐	Run-Length Encoding	🟩	RunLengthEncoding.java	RunLengthEncoding.kt
⭐	Generate Document	🟩	GenerateDocument.java	GenerateDocument.kt
⭐	First Non-Repeating Character	🟩	FirstNonRepeatingCharacter.java	FirstNonRepeatingCharacter.kt
⭐	Three Number Sum	🟦	ThreeNumberSum.java	ThreeNumberSum.kt
⭐	Smallest Difference	🟦	SmallestDifference.java	SmallestDifference.kt
⭐	Move Element To End	🟦	MoveElementToEnd.java	MoveElementToEnd.kt
⭐	Monotonic Array	🟦	MonotonicArray2.java	MonotonicArray2.kt
⭐	Spiral Traverse	🟦	SpiralTraverseIterative.java	SpiralTraverseIterative.kt
⭐	Longest Peak	🟦	LongestPeak.java	LongestPeak.kt
⭐	Array Of Products	🟦	ArrayOfProductsOnOnSimplified.java	ArrayOfProductsOnOnSimplified.kt
⭐	First Duplicate Value	🟦	FirstDuplicateValue.java	FirstDuplicateValue.kt
⭐	Merge Overlapping Intervals	🟦	MergeOverlappingIntervals.java	MergeOverlappingIntervals.kt
⭐	BST Construction	🟦	BstConstructionIterative.java	BstConstructionIterative.kt
⭐	Validate BST	🟦	ValidateBst.java	ValidateBst.kt
⭐	BST Traversal	🟦	BstTraversal.java	BstTraversal.kt