Need Help in understanding problem "RGB Balls"

Revision en1, by np_soo_hard, 2019-08-17 20:47:49

Hi all, I am not able to understand the problem AtCoder RGB-B. Can someone help me explain the statement? How the answer for example-1 is 216.

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en1 English np_soo_hard 2019-08-17 20:47:49 246 Initial revision (published)