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Nozibul Islam
Nozibul Islam

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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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Top comments (2)

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programmerraja profile image
Boopathi β€’

This is a fantastic compilation of queue-related DSA concepts! I'm particularly excited to explore the advanced implementations and problem-solving sections. Thanks for sharing!

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nozibul_islam_113b1d5334f profile image
Nozibul Islam β€’ β€’ Edited

Thank you so much.
You can check out the stack-related DSA questions by going to the link below.
Stack Interview Questions: From Basics to Advanced Problem-Solving

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