Stacks & QueuesLesson 19Free preview

DSA Queues

This lesson is part of DSA · All levels

Summary

Queues are a first in first out (FIFO) data structure, like queues in a drawer: first come, first served. Elements are added at the back (enqueue) and taken from the front (dequeue). Queues are used for sequential task processing, data buffer, and BFS algorithms.

Key points

FIFO principle: first in, first out
Operations: enqueue at the back, dequeue and peek at the front
Can be implemented with a circular array or linked list
Variations include deque, priority queue, and circular queue

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