Breadth-First Search — Interactive Visualization

FIFO queue • visited-on-enqueue • distance = level • top-down expansion

Graph mode • single source

Mode

Preset

Controls

Slow Fast

Queue (front → back, by level)

empty

Distance layers

Step Log

Stats

Current level—

Discovered—

Frontier size—

Edges scanned0

Sources1

Legend

Unvisited

In queue

Current

Done

Source

Wall (grid)