Math problem.

Правка en1, от Sammmmmmm, 2024-02-09 06:29:45

Given R red balls, B blue balls, and G green balls. Count ways to arrange them so that there are exactly k pair RB (red ball is

in front of blue ball).

K <= min(R, B) R, B, G, K <= 1e6

Thanks!

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en1 Английский Sammmmmmm 2024-02-09 06:29:45 218 Initial revision (published)