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DFS Traversal
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35 mins
50 upvotes
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DFS Traversal

Contributed by
Anish De
Medium
yellow-spark
0/80
Avg time to solve 35 mins
Success Rate 65 %
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50 upvotes

Problem Statement

Given an undirected and disconnected graph G(V, E), containing 'V' vertices and 'E' edges, the information about edges is given using 'GRAPH' matrix, where i-th edge is between GRAPH[i][0] and GRAPH[i][1]. print its DFS traversal.

V is the number of vertices present in graph G and vertices are numbered from 0 to V-1. 

E is the number of edges present in graph G.
Note :
The Graph may not be connected i.e there may exist multiple components in a graph.
Detailed explanation ( Input/output format, Notes, Constraints, Images )
Sample Input 1:
5 4
0 2
0 1
1 2
3 4
Sample Output 1:
2
0 1 2
3 4
Explanation For Sample Input 1:
If we do a DFS traversal from vertex 0 we will get a component with vertices [0, 2, 1]. If we do a DFS traversal from 3 we will get another component with vertices [3, 4]

Hence,  we have two disconnected components so on the first line, print 2. Now, print each component in increasing order. On the first line print 0 1 2 and on the second line, print 3 4.

[0 1 2] comes before [3 4] as the first vertex 0 from the first component is smaller than the first vertex 3 from the second component.
Sample Input 2:
9 7
0 1
0 2
0 5
3 6
7 4
4 8
7 8
Sample Output 2:
3
0 1 2 5
3 6
4 7 8
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