# How do you represent an adjacency list?

## How do you represent an adjacency list?

In Adjacency List, we use an array of a list to represent the graph. The list size is equal to the number of vertex(n). Adjlist will have all the nodes which are connected to vertex 0. Adjlist will have all the nodes which are connected to vertex 1 and so on.

How do you represent a multigraph?

(c)Representation of Multigraph: Represented only by adjacency matrix representation. If there exist one or more than one edges between vertex vi and vj then aij=N, where is the number of edges between vi and vj. If there is no edge between vi and vj.

What is an adjacency list used to represent?

In graph theory and computer science, an adjacency list is a collection of unordered lists used to represent a finite graph. Each unordered list within an adjacency list describes the set of neighbors of a particular vertex in the graph.

### How graphs are represented using adjacency lists representation?

An adjacency list represents a graph as an array of linked lists. The index of the array represents a vertex and each element in its linked list represents the other vertices that form an edge with the vertex.

How do you represent directed graph in adjacency list?

An Adjacency List is used for representing graphs. Here, for every vertex in the graph, we have a list of all the other vertices which the particular vertex has an edge to. Problem: Given the adjacency list and number of vertices and edges of a graph, the task is to represent the adjacency list for a directed graph.

What is multigraph example?

When multiple edges are allowed between any pair of vertices, the graph is called a multigraph. Examples of a simple graph, a multigraph and a graph with loop are shown in Figure 8.9. Figure 8.9. Examples of (a) simple graph, (b) multigraph, and (c) graph with loop.

#### Which data structure is used in adjacency list?

Adjacency List Representation. This representation is called the adjacency List. This representation is based on Linked Lists. In this approach, each Node is holding a list of Nodes, which are Directly connected with that vertices.

What does a adjacency list contain?

In general, an adjacency list consists of an array of vertices (ArrayV) and an array of edges (ArrayE), where each element in the vertex array stores the starting index (in the edge array) of the edges outgoing from each node.

Adjacency lists are better for sparse graphs when you need to traverse all outgoing edges, they can do that in O(d) (d: degree of the node). Matrices have better cache performance than adjacency lists though, because of sequential access, so for a somewhat dense graphs, scanning a matrices can make more sense.

## Which of the following can a multigraph contains?

A multigraph G consists of a non-empty set V(G) of vertices and a subset E(G) of the set of unordered pairs of distinct elements of V(G) with a frequency f ≥ 1 attached to each pair.

What is adjacency list in graphs?

An Adjacency List is used for representing graphs. Here, for every vertex in the graph, we have a list of all the other vertices which the particular vertex has an edge to.