Can any one help with this problem.

Правка en1, от deep_tricks, 2021-02-21 15:11:43

There is a 3*n grid which is to be filled with 3 different colors.How many ways can we do it if no column or row have all the cells of same color. N<=20000 and mod 1e9+7

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en1 Английский deep_tricks 2021-02-21 15:11:43 207 Initial revision (published)