ruby - Generate different combinations of arrays using positive integers as elements -


given integer n , different integer k (both positive) want generate possible different arrays of size k containing integers in interval [0..n]. example n = 2 , k = 2 want generate array of arrays contains [0,0], [0,1], [1,0], [0,2], [1,1], [2,0], [1,2], [2,1], [2,2]. result should be

result = [[0,0], [0,1], [1,0], [0,2], [1,1], [2,0], [1,2], [2,1], [2,2]]

the order of elements doesn't matter.

use array#repeated_permutation:

(0..2).to_a.repeated_permutation(2).to_a # => [[0, 0], [0, 1], [0, 2], [1, 0], [1, 1], [1, 2], [2, 0], [2, 1], [2, 2]]

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