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Data Structures for Coding Interviews in Java

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Complexity Measures

Comparing Algorithms Example: Measuring Time Complexity of a Single Loop Algorithm Example: Time Complexity of an Algorithm With Nested Loops Introduction to Asymptotic Analysis and Big O Other Common Asymptotic Notations and Why Big O Trumps Them Useful Formulae Common Complexity Scenarios Challenge: Big (O) of Nested Loop with Addition Solution: Big O of a Nested Loop with Addition Challenge: Big (O) of Nested Loop with Subtraction Solution: Big O of a Nested Loop with Subtraction Challenge: Big O of Nested Loop with Multiplication Solution: Big O of Nested Loop with Multiplication Challenge: Nested Loop with Multiplication (Basic)Solution: Nested Loop with Multiplication (Basic)Challenge: Nested Loop with Multiplication (Intermediate)Solution: Nested Loop with Multiplication (Intermediate)Challenge: Nested Loop with Multiplication (Advanced)Solution: Nested Loop with Multiplication (Advanced)Challenge: Nested Loop with Multiplication (Pro)Solution: Nested Loop with Multiplication (Pro)Complexity Interview Questions

Arrays

What is an Array?

Two Dimensional Arrays

What Is a List?

Challenge: Remove Even Integers From Array

Solution: Remove Even Integers From Array

Challenge: Merge Two Sorted Arrays

Solution: Merge Two Sorted Arrays

Challenge: Find Two Numbers That Add Up to K

Solution: Find Two Numbers That Add Up to K

Challenge: Product of Array Except Self

Solution: Product of Array Except Self

Challenge: Find Minimum Value in Array

Solution: Find Minimum Value in Array

Challenge: First Non-Repeating Integer in an Array

Solution: First Non-Repeating Integer in an Array

Challenge: Find Second Maximum Value in an Array

Solution: Find Second Maximum Value in an Array

Challenge: Rotate Array

Solution: Rotate Array

Challenge: Rearrange Positive & Negative Values

Solution: Rearrange Positive & Negative Values

Challenge: Rearrange Sorted Array in Max/Min Form

Solution: Rearrange Sorted Array in Max/Min Form

Challenge: Maximum Subarray

Solution: Maximum Subarray

Array Interview Questions

Linked Lists

What is the Singly Linked List (SLL)?Basic Linked List Operations Insertion in a Singly Linked List Insertion in Singly Linked List (Insert After)Singly Linked List Deletion (Implementation)Linked Lists vs. Arrays What is a Doubly Linked List (DLL)?Linked List with Tail Challenge: Insertion at Tail Solution: Insertion at Tail Challenge: Search in a Singly Linked List Solution: Search in a Singly Linked List Challenge: Deletion by Value Solution: Deletion by Value Challenge: Find the Length of a Linked List Solution: Find the Length of a Linked List Challenge: Reverse Linked List Solution: Reverse Linked List Challenge: Linked List Cycle Solution: Linked List Cycle Challenge: Middle of the Linked List Solution: Middle of the Linked List Challenge: Remove Duplicates from a Linked List Solution: Remove Duplicates from a Linked List Challenge: Union and Intersection of Linked Lists Solution: Union and Intersection of Linked Lists Challenge: Return the Nth Node from End Solution: Return the Nth Node from End Challenge: Find If a Doubly Linked List Is a Palindrome Solution: Find If a Doubly Linked List Is a Palindrome Linked list Interview Questions

Stack/Queues

What is a Stack?Stack (Implementation)What is a Queue?Queue (Implementation)Challenge: Generate Binary Numbers From 1 to n Using a Queue Solution: Generate Binary Numbers From 1 to n Using a Queue Challenge: Implement Two Stacks Using One Array Solution: Implement Two Stacks Using One Array Challenge: Reverse First k Elements of Queue Solution: Reverse First k Elements of Queue Challenge: Implement Queue Using Stacks Solution: Implement Queue Using Stacks Challenge: Sort Values in a Stack Solution: Sort Values in a Stack Challenge: Evaluate Postfix Expression Using a Stack Solution: Evaluate Postfix Expression Using a Stack Challenge: Next Greater Element Using a Stack Solution: Next Greater Element Using a Stack Challenge: Find the Celebrity Solution: Find the Celebrity Challenge: Valid Parentheses Solution: Valid Parentheses Challenge: Min Stack Solution: Min Stack Stack/Queue Interview Questions

Graphs

What is a Graph?Representation of Graphs Graph Implementation Complexities of Graph Operations What is a Bipartite Graph?Graph Traversal Algorithms Challenge: Implement Breadth-First Search Solution: Implement Breadth-First Search Challenge: Implement Depth-First Search Solution: Implement Depth-First Search Challenge: Detect Cycle in a Directed Graph Solution: Detect Cycle in a Directed Graph Challenge: Find a Mother Vertex in a Directed Graph Solution: Find a Mother Vertex in a Directed Graph Challenge: Count the Number of Edges in an Undirected Graph Solution: Count the Number of Edges in an Undirected Graph Challenge: Check If a Path Exists between Two Vertices Solution: Check If a Path Exists between Two Vertices Challenge: Graph Valid Tree Solution: Graph Valid Tree Challenge: Find the Shortest Path between Two Vertices Solution: Find the Shortest Path between Two Vertices Challenge: Remove Edge from a Directed Graph Solution: Remove Edge from a Directed Graph Graph Interview Questions

Trees

What is a Tree?Types of Trees What Makes a Tree Balanced?What is a Binary Tree?More on Complete Binary Trees Skewed Binary Tree What is a Binary Search Tree (BST)?Insertion in Binary Search Trees Insertion in BST (Complete Implementation)Search in Binary Search Trees (Implementation)Deletion in Binary Search Trees Deletion in Binary Search Trees (Implementation)Pre-Order Traversal in Binary Search Trees In-Order Traversal in Binary Search Trees Post-Order Traversal in Binary Search Tree What is an AVL Tree?AVL Insertion AVL Deletion What is a Red-Black Tree?Red-Black Tree Insertion Red-Black Tree Deletion What is a 2-3 Tree?2-3 Insertion 2-3 Deletion of Element at Leaf Node 2-3 Deletion of Element at Internal Node 2-3-4 Trees Overview of Trees Challenge: Find Minimum Value in Binary Search Tree Solution: Find Minimum Value in Binary Search Tree Challenge: Find kth Maximum Value in Binary Search Tree Solution: Find kth Maximum Value in Binary Search Tree Challenge: Find Ancestors of a Given Node in a BST Solution: Find Ancestors of a Given Node in a BST Challenge: Find the Height of Binary Search Tree Solution: Find the Height of Binary Search Tree Challenge: Find Nodes at k Distance from the Root Solution: Find Nodes at k Distance from the Root Tree Interview Questions

Trie (Advanced Trees)

What is a Trie?The Structure of a Trie Insertion in a Trie Search in a Trie Deletion in a Trie Challenge: Total Number of Words in a Trie Solution: Total Number of Words in a Trie Challenge: Find All Words Stored in Trie Solution: Find All Words Stored in Trie Challenge: Array Sort Using Trie Solution: Array Sort Using Trie Challenge: Word Formation From a Dictionary Using Trie Solution: Word Formation From a Dictionary Using Trie Trie Interview Questions

Heaps

What is a Heap Why Use Heaps?Heap Representation in Arrays Max Heap: Introduction Max Heap (Implementation)Min Heap: An Introduction Min Heap (Implementation)Challenge: Convert Max Heap to Min Heap Solution: Convert Max Heap to Min Heap Challenge: Find k Smallest Elements in an Array Solution: Find k Smallest Elements in an Array Challenge: Find K Largest Elements in an Array Solution: Find K Largest Elements in an Array Heap Interview Questions

Hash Tables

What is a Hash Table?Hash Functions Collisions in Hash Tables Building a Hash Table from Scratch Add/Remove & Search in a Hash Table (Implementation)Complete Implementation of Hash Tables Trie vs Hash Table HashMap vs HashSet Challenge: An Array as a Subset of Another Array Solution: An Array as a Subset of Another Array Challenge: Check if Arrays are Disjoint Solution: Check if Arrays are Disjoint Challenge: Find Symmetric Pairs in an Array Solution: Find Symmetric Pairs in an Array Challenge: Trace the Complete Path of a Journey Solution: Trace the Complete Path of a Journey Challenge: Find Two Pairs in an Array Such That a+b = c+d Solution: Find Two Pairs in an Array Such That a+b = c+d Challenge: A Subarray with a Sum of 0 Solution: A Subarray with a Sum of 0 Challenge: Word Formation Using a Hash Table Solution: Word Formation Using a Hash Table Challenge: Find Two Numbers That Add up to k—Hashing Solution: Find Two Numbers That Add up to k—Hashing Challenge: First Non-Repeating Integer in an Array—Hashing Solution: First Non-Repeating Integer in an Array—Hashing Challenge: Linked List Cycle—Hashing Solution: Linked List Cycle—Hashing Challenge: Remove Duplicates from Linked List - Hashing Solution: Remove Duplicates from Linked List - Hashing Challenge: Union and Intersection of Linked Lists — Hashing Solution: Union and Intersection of Linked Lists — Hashing Hashing Interview Questions

Summary of Data Structures

Overview of Linear & Non-Linear Data Structures Conclusion

Challenge: Rotate Array

Try to solve the Rotate Array problem.

We'll cover the following

Statement
Examples
Try it yourself

Statement

Given an array, nums, and an integer, k, rotate the array to the right by k positions so that each rotation involves shifting the elements one position at a time.

Constraints:

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