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276. Graph – Find Number of non reachable vertices from a given vertex
Objective: Given undirected graph write an algorithm to count the number of non reachable vertices from a given vertex
Example:
Approach:
Use DFS
 Do the DFS (DepthFirst Search) from the given vertex A, Recursively do the DFS from all the adjacent vertices of given vertex A.
 Use the visited array to keep track of visited vertices.
 Once the DFS is completed, count the number of false in visited array. These are the vertices which did not get visit.
Output:
Number of nonreachable vertices from the vertex 0 are: 4 Number of non reachable vertices from the vertex 6 are: 5