Problem-Solving-Hacker-Rank

Interview Preparation Kit

Subdomain: Arrays

#	Problem	Difficulty	Solution	Main Idea
1	2D Array - DS	Easy	Solution	Brute Force
2	Arrays: Left Rotation	Easy	Solution	Brute Force
3	New Year Chaos	Medium	Solution	Brute Force
4	Minimum Swaps 2	Medium	Solution	Brute Force
5	Array Manipulation	Hard	Solution	Difference Array & Prefix Sum

Subdomain: Dictionaries and Hashmaps

#	Problem	Difficulty	Solution	Main Idea
1	Hash Tables: Ransom Note	Easy	Solution	Brute Force
2	Two Strings	Easy	Solution	Brute Force
3	Frequency Queries	Medium	Solution	Brute Force (2 Hash Maps)
4	Sherlock and Anagrams	Medium	Solution	Brute Force & Math (Combinations Formula)

Subdomain: Search

#	Problem	Difficulty	Solution	Main Idea
1	Pairs	Medium	Solution	Brute Force (HashMap)
2	Hash Tables: Ice Cream Parlor	Medium	Solution	Brute Force (HashMap)
3	Triple sum	Medium	Solution	Brute Force & Binary Search)

Subdomain: String Manipulation

#	Problem	Difficulty	Solution	Main Idea
1	Strings: Making Anagrams	Easy	Solution	Brute Force
2	Alternating Characters	Easy	Solution	Brute Force
3	Sherlock and the Valid String	Medium	Solution	Brute Force (HashMap)
4	Special String Again	Medium	Solution	Brute Force
5	Common Child	Medium	Solution 1	Recursive approach with Memoization
-			Solution 2	Dynamic Programming

Subdomain: Warm-up Challenges

#	Problem	Difficulty	Solution	Main Idea
1	Sales by Match	Easy	Solution	Brute Force
2	Counting Valleys	Easy	Solution	Brute Force
3	Jumping on the Clouds	Easy	Solution	Brute Force
4	Repeated String	Easy	Solution	Brute Force

Subdomain: Sorting

#	Problem	Difficulty	Solution	Main Idea
1	Sorting: Bubble Sort	Easy	Solution	Bubble Sort Algorithm
2	Mark and Toys	Easy	Solution	Brute Force
3	Sorting: Comparator	Medium	Solution	Brute Force