Question: Say that an n - vertex directed acyclic graph G is compact if there is some way of numbering the vertices of G with the

Say that an n-vertex directed acyclic graph G is compact if there is some way of
numbering the vertices of G with the integers from 0 to n1 such that G contains the
edge (i, j) if and only if i < j, for all i, j in [0,n1]. Give an O(n2)-time algorithm for
detecting if G is compact.

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