yup must not be true but may be true .

1 vote

Here i have option III is doubt.how option III always correct.one counter example is if i choose a tree where s is root node and v1& v2 are its child node then above question property i.e the vertices V1 and V2 that are simultaneously on the function call stack at some point during the execution of depth-first search from vertex s in a digraph is satisfies.but there is no any path from v1 to v2 or from v2 to v1.

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@srestha, i think it should be,

can you give a counter example in which both are not connected to each other and still both of them are in the stack...?

can you give a counter example in which both are not connected to each other and still both of them are in the stack...?

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okk, i was confused with simultaneous ... if they will be connected then no meaning of simultaneous, hence option A is true...