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Top 50 Problems on Queue Data Structure asked in SDE Interviews

Last Updated : 03 Jul, 2023
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A Queue is defined as a linear data structure that is open at both ends and the operations are performed in First In First Out (FIFO) order. We define a queue to be a list in which all additions to the list are made at one end, and all deletions from the list are made at the other end. The element which is first pushed into the order, the operation is first performed on that. 

To learn more about Queue, please refer to the Tutorial on Queue.

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Given below are the most frequently asked interview questions on Queue:

Easy Interview Questions on Queue Data Structure
Reverse First k Elements of Queue
Implement a Queue using an Array
Print all elements of a queue in a new line
Level with maximum number of nodes
Breadth First Search or BFS for a Graph
Find Minimum Depth of a Binary Tree
Medium Interview Questions on Queue Data Structure
Implement a Deque
Implement a Circular Queue
Check if a queue can be sorted into another queue using a stack
Implement Stack using Queues
Implement Stack using Two Queues
Implement Queue using Two Stacks
Design a Queue data structure to get minimum or maximum in O(1) time
Check whether a given graph is Bipartite or not
Print Right View of a Binary Tree
An Interesting Method to Generate Binary Numbers from 1 to n
Implement a Queue using a Stack
Reverse a queue using recursion
Implement Priority Queue using Linked List
Implement Queue using Deque
Flatten a multilevel linked list
Find next right node of a given key
Detect cycle in an undirected graph using BFS
Minimum steps to reach target by a Knight
Islands in a graph using BFS
Flood Fill Algorithm
Minimum steps to reach target by a Knight
First negative integer in every window of size k
Level order traversal in spiral form
Minimum time required to rot all oranges
Queue based approach or first non-repeating character in a stream
Shortest distance in a maze
Geek in a Maze
Find shortest safe route in a path with landmines
Find the first circular tour that visits all petrol pumps
Connect Nodes at Same Level
Hard Interview Questions on Queue Data Structure
Find the first non-repeating character from a stream of characters
Maximum of all subarrays of size k using a queue
Implement LRU Cache using Queue

Design a Queue data structure to get the maximum or minimum of sliding window

Find if there is a path between two vertices in a directed graph
Design a Data Structure for LRU Cache

Trapping Rain Water

Maximum cost path from source node to destination

Trapping Rain Water
Maximum cost path from source node to destination
Snake and Ladder Problem

Minimum Cost Path in a directed graph via given set of intermediate nodes

Turn a Queue into a Priority Queue
Interchange elements of Stack and Queue without changing order


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