Top 50 Problems on Queue Data Structure asked in SDE Interviews Last Updated : 20 Feb, 2025 Comments Improve Suggest changes Like Article Like Report 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.Easy ProblemsReverse First k Elements of QueueImplement a Queue using an ArrayPrint all elements of a queue in a new lineLevel with maximum number of nodesBreadth First Search or BFS for a GraphFind Minimum Depth of a Binary TreeMedium ProblemsImplement a DequeImplement a Circular QueueCheck if a queue can be sorted into another queue using a stackImplement Stack using QueuesImplement Stack using Two QueuesImplement Queue using Two StacksDesign a Queue data structure to get minimum or maximum in O(1) timeCheck whether a given graph is Bipartite or notPrint Right View of a Binary TreeAn Interesting Method to Generate Binary Numbers from 1 to nImplement a Queue using a StackReverse a queue using recursionImplement Priority Queue using Linked ListImplement Queue using DequeFlatten a multilevel linked listFind next right node of a given keyDetect cycle in an undirected graph using BFSMinimum steps to reach target by a KnightIslands in a graph using BFSFlood Fill AlgorithmMinimum steps to reach target by a Knight First negative integer in every window of size kLevel order traversal in spiral formMinimum time required to rot all orangesQueue based approach or first non-repeating character in a streamShortest distance in a mazeGeek in a MazeFind shortest safe route in a path with landminesFind the first circular tour that visits all petrol pumpsConnect Nodes at Same LevelHard ProblemsFind the first non-repeating character from a stream of charactersMaximum of all subarrays of size k using a queueImplement LRU Cache using QueueDesign a Queue data structure to get the maximum or minimum of sliding windowFind if there is a path between two vertices in a directed graphDesign a Data Structure for LRU CacheTrapping Rain WaterMaximum cost path from source node to destinationTrapping Rain WaterMaximum cost path from source node to destinationSnake and Ladder ProblemMinimum Cost Path in a directed graph via given set of intermediate nodesTurn a Queue into a Priority QueueInterchange elements of Stack and Queue without changing order Comment More infoAdvertise with us Next Article Top 50 Problems on Recursion Algorithm R RishabhPrabhu Follow Improve Article Tags : Queue DSA top-dsa-problems Practice Tags : Queue Similar Reads SDE SHEET - A Complete Guide for SDE Preparation Here is a curated list of the most popular questions among important topics, such as Programming Languages, Data Structure and Algorithms (DSA), CS Subjects, Aptitude, etc, asked in the Software Development Engineer Interviews. This sheet contains a wide range of coding questions from different Data 8 min read DSA Tutorial - Learn Data Structures and Algorithms DSA (Data Structures and Algorithms) is the study of organizing data efficiently using data structures like arrays, stacks, and trees, paired with step-by-step procedures (or algorithms) to solve problems effectively. Data structures manage how data is stored and accessed, while algorithms focus on 7 min read Top 50 Array Coding Problems for Interviews Array is one of the most widely used data structure and is frequently asked in coding interviews to the problem solving skills. The following list of 50 array coding problems covers a range of difficulty levels, from easy to hard, to help candidates prepare for interviews.Easy ProblemsSecond Largest 2 min read Top 50 Problems on Matrix/Grid Data Structure asked in SDE Interviews A Matrix/Grid is a two-dimensional array that consists of rows and columns. It is an arrangement of elements in horizontal or vertical lines of entries. Here is the list of the top 50 frequently asked interview questions on Matrix/Grid in the SDE Interviews. Problems in this Article are divided into 2 min read Top 50 String Coding Problems for Interviews String-related problems often assess a candidate's understanding of concepts like pattern matching, manipulation, and efficient algorithm design. Here is the collection of the Top 50 list of frequently asked interview questions on Strings. Problems in this Article are divided into three Levels so th 2 min read Top 50 Problems on Stack Data Structure asked in SDE Interviews A Stack is a linear data structure in which the insertion of a new element and removal of an existing element takes place at the same end, represented as the top of the stack. To learn about Stack Data Structure in detail, please refer to the Tutorial on Stack Data Structure.Easy ProblemsParenthesis 2 min read Top 50 Problems on Queue Data Structure asked in SDE Interviews 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 w 3 min read Top 50 Problems on Recursion Algorithm Recursion is one of the most essential algorithms that uses the concept of code reusability and repeated usage of the same piece of code. In this post, we have curated an extensive list of interview questions asked around the Recursion Algorithm. The point that makes Recursion one of the most used a 2 min read Top 20 Backtracking Algorithm Interview Questions Backtracking is a powerful algorithmic technique used to solve problems by exploring all possible solutions in a systematic and recursive manner. It is particularly useful for problems that require searching through a vast solution space, such as combinatorial problems, constraint satisfaction probl 1 min read Top Sorting Interview Questions and Problems Here is the collection of the Top 50 list of frequently asked interview questions on Sorting. Problems in this article are divided into three Levels so that readers can practice according to the difficulty level step by step. Easy Problems Duplicates within k distanceMaximum Perimeter TriangleMaximi 5 min read Like