Question: Consider a digraph with n vertices and m edges represented in a matrix. The source - removal algorithm of topological sorting has the running time

Consider a digraph with n vertices and m edges represented in a matrix. The source-removal algorithm of topological sorting has the running time in
Group of answer choices
O(n+m)
O(n2+m)
O(nlogn + m)
O(n + mlogm)

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