Composed data type haskell

Question

So, I have this function:

solve x y = do
            ...
            return (newx,y++[1])

where x and newx are [[Int]] and y is [Int]. And with this function, I will return a "value". Now, I would like to know how can I "process" this value in order to extract the 2 components and use them separately.

Something like this:

a <- solve x y
b <- a[0]
c <- a[1]

Answer 1

as the return will wrap it into some monad, you can then get to the parts by deconstructing it directly inside a do block like this:

do
    (b,c) <- solve x y