# Can You Run Topological Sort On A Graph That Is Undirected?

## How do you check if there is a cycle in an undirected graph?

To detect if there is any cycle in the undirected graph or not, we will use the DFS traversal for the given graph.

For every visited vertex v, when we have found any adjacent vertex u, such that u is already visited, and u is not the parent of vertex v.

Then one cycle is detected..

## What is topological sorting in graph?

In computer science, a topological sort or topological ordering of a directed graph is a linear ordering of its vertices such that for every directed edge uv from vertex u to vertex v, u comes before v in the ordering. …

## Is topological sort DFS?

Topological sort is a DFS-based algorithm on a directed acyclic graph (DAG). Topological ordering is a linear ordering of vertices such that for every directed edge uv, vertex u comes before v in the ordering. A topological ordering is possible if and only if the graph has no directed cycles.

## What is the advantage of counting sort over quick sort?

What is the advantage of counting sort over quick sort? Explanation: Counting sort is very efficient in the cases where range is comparable to number of input elements as it performs sorting in linear time.

## What is single source shortest path algorithm?

The single source shortest path algorithm (for arbitrary weight positive or negative) is also known Bellman-Ford algorithm is used to find minimum distance from source vertex to any other vertex. … At first it finds those distances which have only one edge in the path.

## Is a self loop a cycle?

A cycle in a graph is, according to Wikipedia, An edge set that has even degree at every vertex; also called an even edge set or, when taken together with its vertices, an even subgraph. In your case, the single vertex has a degree of 2, which is even. Therefore the self-loop is a cycle in your graph.

## What does topological sort return?

The topological sort algorithm takes a directed graph and returns an array of the nodes where each node appears before all the nodes it points to. The ordering of the nodes in the array is called a topological ordering.

## How do you tell if a graph is directed or undirected?

Undirected graphs have edges that do not have a direction. The edges indicate a two-way relationship, in that each edge can be traversed in both directions. This figure shows a simple undirected graph with three nodes and three edges. Directed graphs have edges with direction.

## When the topological sort of a graph is unique?

Explanation: The topological sort of a graph can be unique if we assume the graph as a single linked list and we can have multiple topological sort order if we consider a graph as a complete binary tree. 6.

## Is topological sort greedy?

Topological sort is a greedy algorithm. A matrix chain product problem has a chain of four matrices ABCD.

## Can BFS detect cycle?

BFS wont work for a directed graph in finding cycles. Consider A->B and A->C->B as paths from A to B in a graph. BFS will say that after going along one of the path that B is visited. When continuing to travel the next path it will say that marked node B has been again found,hence, a cycle is there.

## How do you prove a graph is acyclic?

To test a graph for being acyclic:If the graph has no nodes, stop. The graph is acyclic.If the graph has no leaf, stop. The graph is cyclic.Choose a leaf of the graph. … Go to 1.If the Graph has no nodes, stop. … If the graph has no leaf, stop. … Choose a leaf of Graph. … Go to 1.

## Can topological sort detect cycles?

In Topological Sort, the idea is to visit the parent node followed by the child node. If the given graph contains a cycle, then there is at least one node which is a parent as well as a child so this will break Topological Order.

## What is the purpose of topological sorting?

A topological sort takes a directed acyclic graph and produces a linear ordering of all its vertices such that if the graph G contains an edge (v,w) then the vertex v comes before the vertex w in the ordering. Directed acyclic graphs are used in many applications to indicate the precedence of events.

## How many topological sorting ordering is possible?

There can be more than one topological sorting for a graph.