C# Data Structures and Algorithms

Depth-first search

The first graph traversal algorithm described in this chapter is named DFS. Its steps, in the context of the example graph, are as follows:

Of course, it can be a bit difficult to understand how the DFS algorithm operates just by looking at the preceding diagram. For this reason, let's try to analyze its stages.

In the first step, you see the graph with eight nodes. The node 1 is marked with a gray background (indicating that the node has been already visited), as well as with a red border (indicating that it is the node that is currently being visited). Moreover, an important role in the algorithm is performed by the neighbor ...