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)