AdjacencyLists: A Graph as a Collection of Lists

Adjacency list representations of graphs take a more vertex-centric approach. There are many possible implementations of adjacency lists. In this section, we present a simple one. At the end of the section, we discuss different possibilities. In an adjacency list representation, the graph G=(V,E)G = (V ,E) is represented as an array, adj, of lists. The list adj[i] contains a list of all the vertices adjacent to vertex i. That is, it contains every index jj such that (i,j) E\in E.

Visual demonstration of the adjacency list

The visual demonstration of the adjacency list is shown below:

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