Deque Interview Questions for SDE Interviews Last Updated : 22 Sep, 2025 Comments Improve Suggest changes 4 Likes Like Report A Deque (Double-Ended Queue) is a flexible data structure that supports insertion and deletion from both ends in O(1) time. In SDE interviews, deques are frequently tested in problems involving efficient subarray computations, maintaining order constraints, and implementing caching mechanisms. Circular Array Implementation of DequeImplementation of Deque using doubly linked list Stack and Queue Implementation using Deque Reverse First K Elements of a QueueFirst Negative in Every Window of Size KMaximum of all subarrays of size KSum of Min & Max in All Subarrays of Size KMaximum score possible Longest subarray with at most k difference0-1 BFSLongest Subarray with Max Pair Difference ≤ X Minimize the Max difference between adjacent Bitonic Sequence from a given range Queue with Minimum Comment U ujjwalroq0 Follow 4 Improve U ujjwalroq0 Follow 4 Improve Article Tags : Queue DSA Explore DSA FundamentalsLogic Building Problems 2 min read Analysis of Algorithms 1 min read Data StructuresArray Data Structure 3 min read String in Data Structure 2 min read Hashing in Data Structure 2 min read Linked List Data Structure 2 min read Stack Data Structure 2 min read Queue Data Structure 2 min read Tree Data Structure 2 min read Graph Data Structure 3 min read Trie Data Structure 15+ min read AlgorithmsSearching Algorithms 2 min read Sorting Algorithms 3 min read Introduction to Recursion 14 min read Greedy Algorithms 3 min read Graph Algorithms 3 min read Dynamic Programming or DP 3 min read Bitwise Algorithms 4 min read AdvancedSegment Tree 2 min read Binary Indexed Tree or Fenwick Tree 15 min read Square Root (Sqrt) Decomposition Algorithm 15+ min read Binary Lifting 15+ min read Geometry 2 min read Interview PreparationInterview Corner 3 min read GfG160 3 min read Practice ProblemGeeksforGeeks Practice - Leading Online Coding Platform 6 min read Problem of The Day - Develop the Habit of Coding 5 min read Like