README.md

Puzzlers

This repository contains a set of programming puzzles that are solved using Java or Kotlin programming language. Tests provided for every problem.

Project structure

The project directory structure is as follows:

.
├── src/main                                  # Source files
│   ├── java                                  # Java sources
│   ├── kotlin                                # Kotlin sources
├── src/test                                  # Test files
│   ├── resources/.../*tested-class-name*/    # Tested class resources (input and output files)
├── LICENSE
└── README.md

Test source

TestSource annotation and TestSourceProvider are junit's ArgumentProvider implementation that search for the test resources (input and output files) in the directory structure, the same as test(ed) class package. Allows to test different class implementations (solutions to the problem) for every input-output pair file as in the code snippet below:

@ParameterizedTest
@TestSource(
    value = RucksackReorganization::class, // used as single implementation if no custom implementations provided.
    implementations = [RucksackReorganization::class, IdiomaticRucksackReorganization::class]
)
fun findTotalRearrangementPriority(rucksackReorganization: RucksackReorganization, input: Path, output: Path)

With execution of 4 tests for 2 implementations and 2 input-output pairs.

Advent of Code 2022

Advent of Code 2022 challenge.

Day	Problem	Solution
1	Calorie Counting	CalorieCounting.kt
2	Rock Paper Scissors	RockPaperScissors.kt
3	Rucksack Reorganization	RucksackReorganization.kt
4	Camp of Cleanup	CampCleanup.kt
5	Supply Stacks	SupplyStacks.kt
6	Tuning Trouble	TuningTrouble.kt
7	No Space Left On Device	DeviceSpace.kt
8	Treetop Tree House	TreetopTreeHouse.kt
9	Rope Bridge	RopeBridge.kt
10	Cathode-Ray Tube	CathodeRayTube.kt
11	Monkey In The Middle	MonkeyInTheMiddle.kt
12	Hill Climbing Algorithm	HillClimbingAlgorithm.kt
13	Distress Signal	DistressSignal.kt
14	Regolith Reservoir	RegolithReservoir.kt

Leetcode

The following challenges from the Leetcode.

Top Interview Questions

This is the list of the Top Interview Questions.

Number	Problem	Solution
1	Two Sum	TwoSum.java
2	Add Two Numbers	AddTwoNumbers.java
5	Longest Palindromic Substring	LongestPalindromicSubstring.kt
13	Roman to Integer	RomanToInt.kt
14	Longest Common Prefix	LongestCommonPrefix.kt
20	Valid Parentheses	ValidParentheses.kt
26	Remove Duplicates from Sorted Array	RemoveDuplicatesFromSortedArray.kt
28	Find the Index of the First Occurrence in a String	FirstOccurrenceInString.kt
33	Search in Rotated Sorted Array	SearchInRotatedSortedArray.java
38	Count and Say	CountAndSay.kt
54	Spiral Matrix	SpiralMatrix.kt
55	Jump Game	JumpGame.java
69	Sqrt(x)	Sqrt.kt
70	Climbing Stairs	ClimbingStairs.kt
78	Subsets	Subsets.kt
94	Binary Tree Inorder Traversal	BinaryTreeInOrderTraversal.kt
101	Symmetric Tree	SymmetricTree.kt
104	Maximum Depth of Binary Tree	BstMaxDepth.kt
124	Binary Tree Maximum Path Sum	BinaryTreeMaxPath.java
125	Valid Palindrome	ValidPalindromeSentence.kt
136	Single Number	SingleNumber.java
146	LRU Cache	LRUCache.java
152	Maximum Product Subarray	MaxProductSubarray.kt
169	Majority Element	MajorityElement.java
191	Number of 1 Bits	BitsNumber.kt
200	Number of Islands	NumberOfIslands.java
202	Happy Number	HappyNumber.java
208	Implement Trie (Prefix Tree)	Trie.java
230	Kth Smallest Element in a BST	KthSmallestElementInBst.java
238	Product of Array Except Self	ProductExceptSelf.java
328	Odd Even Linked List	OddEvenLinkedList.java
344	Reverse String	ReverseString.kt
347	Top K Frequent Elements	TopKFrequentElements.kt
350	Intersection of Two Arrays II	TwoArrayIntersectionII.kt
387	First Unique Character in a String	FirstUniqueChar.java
412	Fizz Buzz	FizzBazz.kt

May LeetCoding Challenge

May LeetCoding consists of 31 daily problems over May. Beginner-friendly.

Day	Number	Problem	Solution
1	278	First Bad Version	FirstBadVersion.java
2	771	Jewels And Stones	JewelsAndStones.java
3	383	Ransom Note	RansomNote.java
4	476	Number Complement	NumberComplement.java
5	387	First Unique Character in a String	FirstUniqueChar.java
6	169	Majority Element	MajorityElement.java
7	993	Cousins in Binary Tree	CousinsInBinaryTree.java
8	1232	Check If It Is a Straight Line	CheckStraightLine.java
9	367	Valid Perfect Square	ValidPerfectSquare.java
10	997	Find the Town Judge	FindTownJudge.java
11	733	Flood Fill	FloodFill.java
12	540	Single Element in a Sorted Array	SingleElementInSortedArray.java
13	402	Remove K Digits	RemoveDigits.java
14	208	Implement Trie (Prefix Tree)	Trie.java
15	918	Maximum Sum Circular Subarray	MaxSumCircularSubarray.java
16	328	Odd Even Linked List	OddEvenLinkedList.java
17	438	Find All Anagrams in a String	FindAllAnagrams.java
18	567	Permutation in String	PermutationInString.java
19	901	Online Stock Span	StockSpanner.java
20	230	Kth Smallest Element in a BST	KthSmallestElementInBst.java
21	1277	Count Square Submatrices with All Ones	CountSquareSubmatrices.java
22	451	Sort Characters By Frequency	SortCharactersByFrequency.java
23	986	Interval List Intersections	IntervalListIntersection.java
24	1008	Construct Binary Search Tree from Preorder Traversal	BinarySearchTreeFromPreorder.java
25	1035	Uncrossed Lines	UncrossedLines.java
26	525	Contiguous Array	ContiguousArray.java
27	886	Possible Bipartition	PossibleBipartition.java
28	338	Counting Bits	CountingBits.java