AdjacencyLists: A Graph as a Collection of Lists
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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 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 such that (i,j)
.
Visual demonstration of the adjacency list
The visual demonstration of the adjacency list is shown below:
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