Graph Traversal - Breadth-First Search

Introduction

Graph traversal means visiting every vertex and edge exactly once in a well-defined order. While using certain graph algorithms, you must ensure that each vertex of the graph is visited exactly once. The order in which the vertices are visited is important and may depend upon the algorithm or question that you are solving. During a traversal, it is important that you track which vertices have been visited. The most common way of tracking vertices is to mark them.

Breadth-first search approach

There are many ...