DSA: Essential Queue Interview Questions and Challenges

DSA: Essential Queue Interview Questions and Challenges.

1. Queue Basics

• Implement a Queue Using Arrays
• Implement a Queue Using Linked Lists
• Implement a Circular Queue
• Implement a Double-Ended Queue (Deque)
• Implement a Queue Using Two Stacks
• Implement a Stack Using Two Queues
• Implementing a Queue Using Recursion
• Circular Tour Problem (Petrol Pump Problem)
• Generate Binary Numbers from 1 to N Using a Queue
• Reverse the First K Elements of a Queue

2. Advanced Queue Implementations

• Implement a Priority Queue
• Implement a Min Priority Queue
• Implement a Max Priority Queue
• Implement a Queue with Dynamic Resizing
• Design a Queue with Increment Operation
• Implement a Queue Using a Doubly Linked List
• Implement a Monotonic Queue
• LRU Cache Implementation Using Queue
• Implement a Queue to Support Middle Element Access
• Implement Queue Sorting Using Recursion

3. Queue Problem Solving

• First Non-Repeating Character in a Stream
• Sliding Window Maximum
• Sliding Window Minimum
• Rotten Oranges (Time to Rot All Oranges)
• Interleave the First Half of the Queue with the Second Half
• Implement a Circular Buffer
• Implement a Custom Queue with Customized Push/Pop Rules
• Check if a Given Sequence of Operations is Valid for a Queue
• Finding the Maximum in Every Window of Size K
• Design a Queue That Supports GetMin and GetMax in O(1) Time

5. Queue and Recursion

• Reverse a Queue Using Recursion
• Sort a Queue Using Recursion
• Interleave Two Queues Recursively
• Merge Two Sorted Queues Using Recursion
• Recursively Insert an Element at the Rear of a Queue
• Implement a Recursive BFS for Tree Traversal
• Recursively Reverse First K Elements in a Queue
• Flattening a Queue of Queues
• Recursive Sliding Window Maximum Using Queue
• Implement Recursive Depth Calculation Using Queue

6. Queue Variants and Real-World Applications

• Implement a Circular Queue Using Array and Linked List
• Simulate a Printer Queue
• Design a Queue for Task Scheduling (like CPU task scheduling)
• Queue Implementation for Real-Time Messaging Systems
• Implement a Ticketing System Using a Queue
• Simulate a Banking Queue System
• Design an Order Processing System Using Queues

7. Queue-Based Algorithms

• Snake and Ladder Problem Using BFS
• Shortest Path in a Binary Maze Using BFS
• Design an Algorithm for Job Scheduling Using a Priority Queue
• Zombie Matrix Problem Using BFS
• Implement Level Order Traversal of a Binary Tree Using a Queue
• Calculate the Time Needed to Process All Tasks Given Their Processing Time and a Queue

8. Queue Operations and Optimizations

• Implement a Fixed-Size Queue Using Two Pointers
• Queue with Reordering Based on Certain Conditions
• Find the Median in a Stream Using Two Queues
• Optimize Queue Operations for Specific Constraints
• Implement Multi-Level Priority Queues

9. Queue Interview Challenges

• Implement a Producer-Consumer Problem Using Queues
• Check If a Queue Can Be Sorted into Another Queue Using a Stack
• Design a Queue to Handle Time-Based Events (e.g., Expiring Items in a Cache)
• Implement Multi-Threaded Queue Processing
• Design a Queue with Real-Time Statistics Reporting

10. Queue Challenges in Competitive Programming

• Sliding Window Median
• Find the Minimum Time Required to Complete All Tasks Given a Queue and Cool Down Time
• Print All Nodes at Distance K from a Given Node in a Binary Tree Using BFS
• Merge K Sorted Queues Using a Min-Heap
• Implement a Queue to Handle Multiple Data Types

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