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?
i have a question
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?
Rev. | Lang. | By | When | Δ | Comment | |
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en1 | VirtualDimension | 2020-09-21 04:50:49 | 123 | Initial revision (published) |