Permute lists of lists

Question

Given n arrays of random sizes, I need to permute them like this:

[a1, a2, a3]
[b1, b2]
[c1, c2]

[a1, b1, c1]
[a1, b1, c2]
[a1, b2, c1]
[a1, b2, c2]
[a2, b1, c1]
[a2, b1, c2]
[a2, b2, c1]
[a2, b2, c2]
[a3, b1, c1]
[a3, b1, c2]
[a3, b2, c1]
[a3, b2, c2]

The columns order matters, lines dont.

What is good way to achieve this. If possible, using this method contract:

<T> List<List<T>> permute(List<T>... lists)

It looks like you need all combinations from n lists, but with a **fixed** length of 3. It's an important piece of information and you should include it in your question — Soutzikevich, Jun 02 '19 at 13:21

score 0 · Answer 1 · answered Jun 02 '19 at 12:21

0

What you're searching for is a combination, not a permutation. May have a look at this: Generate all combinations from multiple lists

answered Jun 02 '19 at 12:21

Tobias

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Permute lists of lists

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