CZ
CalcyZone
computer-science Verified Precision Tool

Breadth First Search (BFS) Visualizer

Step-by-step BFS graph traversal visualizer tracking queue operations and visited node sets.

Interactive Algorithm Visualizer

BFS Traversal

Enter your custom input data → Run the real algorithm engine → Observe step transitions.

⚙️ Customize Algorithm Input Data

Step 1 of 5⚡ Algorithm Running
WHAT HAPPENED?

Visited node A

WHY?

Node A was at the head of the BFS FIFO queue

WHAT CHANGED?

Order: [A]

Interactive SVG Graph Canvas

421582ABCDE

Mathematical Formula

Enqueue start node. While queue not empty: dequeue u, visit unvisited neighbors, enqueue.

Overview & Explanation

Breadth First Search traverses a graph level by level using a Queue data structure.

How It Works

  • Enqueue starting node and mark visited.
  • Dequeue node, process neighbors, and enqueue unvisited neighbors.

Practical Applications

  • Shortest path in unweighted graphs
  • Web crawlers
  • Social network connections

BFS Traversal Example

Traversal from node A

1

Queue

Dequeue A

= Visited: A, Queue: [B, C]

Frequently Asked Questions

Does BFS guarantee shortest path in unweighted graphs?
Yes, BFS visits nodes in order of distance from start node, guaranteeing shortest path in unweighted graphs.