How to flatten a list of lists of lists in haskell

Question

All I want to do is what I ask. The type signature of the function should be this:

flatten::[[[Int]]] -> [[Int]]

I tried to search some flatten code but they define new types and that confuses me. Any help? Thanks in advance.

Answer 1

You are looking for

concat :: [[a]] -> [a]

In your use case, the element type happens to be [Int].