i have a question - Codeforces

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i have a question

Revision en1, by VirtualDimension, 2020-09-21 04:50:49

f(l, r) = max(al,al+1...ar), g(l, r) = min(al, al+1...ar)

How can i calc ∑∑f(l,r) * g(l,r) mod 1e9 + 7?

Revisions

	Rev.	Lang.	By	When	Δ	Comment
	en1		VirtualDimension	2020-09-21 04:50:49	123	Initial revision (published)