Problem B in Round #758 (Div.1 + Div. 2) using TopoSort ?

Правка en1, от GlydonNeedsDedication, 2021-12-12 16:10:41

I saw this Solution of Problem B by maroonrk using Topological sort in contest Round #758 (Div.1 + Div. 2)
Can anybody explains the intuition please?

Теги query, discussion

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en2 Английский GlydonNeedsDedication 2021-12-12 16:11:50 9
en1 Английский GlydonNeedsDedication 2021-12-12 16:10:41 438 Initial revision (published)