Can anyone please explain me the problem? i have been trying hard to understand this. https://www.e-olymp.com/en/contests/16462/problems/170299 the asked for maximum distance so in their second testcase isn't from 4 to 5 the distance is minimum?
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Given a directed graph with n vertices and m edges. Find the maximum shortest distance from some vertex to the given vertex s.
It asks for the distance, not the node. 4 is the distance from the farthest node to S.
Just build the inverted graph and do one single BFS from S. The maximum depth of the BFS is the answer.