Queue • Advanced Architecture

BFS using Queue

Breadth-First Search (BFS) is a core graph algorithm that systematically explores layers of a graph. A Queue is fundamentally required to maintain this level-by-level exploration order.

The Need for Fairness

If you start at Node A and it has neighbors B, C, D, you must explore all three before exploring B's neighbors. A Queue (FIFO) guarantees that earlier discovered nodes are processed before later ones.

The BFS Template

Enqueue the start node. Loop while the queue is not empty: Dequeue a node, process it, mark it visited, and enqueue all its unvisited neighbors. Repeat.

Shortest Path Guarantee

Because of the Queue's FIFO nature, you are guaranteed that the first time you discover a node, you have found the absolute shortest path to it (in an unweighted graph).

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Queue • Advanced Architecture

BFS using Queue

Breadth-First Search (BFS) is a core graph algorithm that systematically explores layers of a graph. A Queue is fundamentally required to maintain this level-by-level exploration order.

The Need for Fairness

The BFS Template

Enqueue the start node. Loop while the queue is not empty: Dequeue a node, process it, mark it visited, and enqueue all its unvisited neighbors. Repeat.

Shortest Path Guarantee

Because of the Queue's FIFO nature, you are guaranteed that the first time you discover a node, you have found the absolute shortest path to it (in an unweighted graph).

Bfs Using Queue

Bfs Using Queue

BFS using Queue

The Need for Fairness

The BFS Template

Shortest Path Guarantee

BFS using Queue

The Need for Fairness

The BFS Template

Shortest Path Guarantee