check if undirected graph is connected

How do you know if a graph is 2 connected?
A graph is 2-connected if it is connected and contains at least 3 vertices, but no cut ver- tex.
A graph is 2-edge-connected if it is connected and contains at least 2 vertices, but no bridge.
Start DFS(Depth First Search) from any of the vertexes and mark the visited vertices as True in the visited[] array.
After completion of DFS check if all the vertices in the visited [] array is marked as True.
If yes then the graph is connected, or else the graph is not connected or disconnected._{2 fév. 2021}

How to check if a graph is connected in C?

The program output is also shown below.

1#include<stdio.h>2#include<conio.h>3int a[20][20], q[20], visited[20], n, i, j, f = 0, r = -1;4void bfs(int v) {5for (i = 1; i <= n; i++)6if (a[v][i] && visited[i])7q[++r] = i;8if (f <= r) {

Is the undirected graph connected?

An undirected graph is graph, i.e., a set of objects (called vertices or nodes) that are connected together, where all the edges are bidirectional.
An undirected graph is sometimes called an undirected network.
In contrast, a graph where the edges point in a direction is called a directed graph.

A simple way to check if a graph is connected is to have a boolean of visited nodes. Run bfs or dfs and whenever you are at a node, mark it at visited. When your algorithm is done running, if all vertices were not visited then your graph is disconnected.

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Graph Algorithms

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