Ordered Data Structure • Priority Queue

Priority Queue Visualization

An extended queue abstract data type where each element possesses an associated priority level. Elements with higher priority are dequeued ahead of lower priority items.

Abstract Data Type Properties

Unlike standard FIFO queues where arrival sequence dictates service order, priority queues service critical tasks first. Fundamental applications include Dijkstra's Shortest Path, A* Search, Prim's MST, and OS real-time process interrupt handlers.

Service Order
Highest Priority First
Priority Mechanism
Precedence Insertion
Primary Operation
Extract-Max / Dequeue

Operations Panel

1. Queue Capacity Configuration
2. Mutation Operations
3. Queue Inspection & Queries
Priority Order Pipeline
FRONT (Highest)

Queue is empty

BACK (Lowest)
Set max size and perform operations to inspect priority queue state

Educational Reference

Priority Partitioning

High-priority items (marked with P) are maintained ahead of standard items, guaranteeing expedited service.

FIFO Within Same Priority

Elements sharing equal priority maintain relative FIFO ordering among themselves.

Heap vs Array Implementation

While implemented here as an ordered array, production systems typically utilize Binary Heaps to achieve O(log n) enqueue.

Common Applications

Network packet routing (QoS), emergency room triaging, discrete event simulation, and bandwidth throttling.