Question: in solving activity selection problem, the greedy algorithm in the text book, the activities are sorted according to the end time, and the algorithm begins

in solving activity selection problem, the greedy algorithm in the text book, the activities are sorted according to the end time, and the algorithm begins with the first element and proceeds forward. consider the greedy algorithm that sorts the activities according to the begin time, select the last element and proceed down towards the first element.

show that the proposed alternative also yields maximum size mutually compatible subset

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