HackerRank Interview Preparation Kit

• Python implementation will be linked below.

Chapter	Sub-Chapter	Level
Arrays	2D Arrays	1
	Arrays: Left Rotation	1
	New Year Chaos	2
	Minimum Swaps 2	2
	Array Manipulation	3
Dictionaries and Hashmaps	Ransom Note	1
	Two Strings	1
	Sherlock and Anagrams	2
	Count Triplets	2
	Frequency Queries	2
Sorting	Bubble Sort	1
	Mark and Toys	1
	Comparator	2
	Fraudulent Activity Notifications	2
	Counting Inversions - Merge Sort	3
String Manipulation	Making Anagrams	1
	Alternating Characters	1
	Sherlock and Valid String	2
	Special String Again	2
	Common Child	2
Greedy Algorithms	Minimum Absolute Difference in an Array	1
	Luck Balance	1
	Greedy Florist	2
	Max Min	2
	Reverse Shuffle Merge	3
Search	Hash Tables: Ice Cream Parlor	2
	Swap Nodes [Algo]	2
	Pairs	2
	Triple Sum	2
	Minimum Time Required	2
	Maximum Subarray Sum	3
	Making Candies	3
Dynamic Programming	Max Sum Array	2
	Abbreviation	2
	Candies	2
	Decibinary Numbers	3
Stacks and Queues	Balanced Brackets	2
	Queues: A Tale of Two Stacks	2
	Largest Rectangle	2
	Min Max Riddle	2
	Castle on the Grid	2
	Poisonous Plants	3
Graphs	Roads and Libraries	2
	Find the nearest clone	2
	BFS: Shortest Reach in a Graph	3
	DFS: Connected Cell in a Grid	3
	Matrix	3
Trees	Tree: Height of a Binary Tree	1
	Binary Search Tree: Lowest Common Ancestor	1
	Tree: Is This a Binary Search Tree?	2
	Tree: Huffman Decoding	2
	Balanced Forest	3
Linked List	Insert a node at a specific position in a linked list - C	1
	Insert a node at a specific position in a linked list - Java	1
	Inserting a Node Into a Sorted Doubly Linked List	1
	Reverse a doubly linked list	1
	Find Merge Points of Two lists	1
	Linked Lists: Detect a cycle	1
Recursion and Backtracking	Fibonacci Numbers	1
	Davis’ Staircase	2
	Crossword Puzzle	2
	Recursive Digit Sum	2
Miscellaneous	Flipping Bits	1
	Time Complexity: Primality	2
	Friend Circle Queries	2
	Maximum Xor	2