#double-ended-queue

Deques (Double-Ended Queues)

Introduction A deque (pronounced “deck”) is short for “double-ended queue”—a linear data structure that allows insertion and deletion at both the front and the rear. Think of it as a hybrid between a stack and a queue, offering the flexibility to add or remove elements from either end. This versatility makes deques powerful for problems requiring sliding windows, palindrome checking, and maintaining ordered sequences with efficient operations at both ends. By the end of this tutorial, you’ll understand when deques shine and how to implement them efficiently. Read more →

November 19, 2025