[Haskell-cafe] Help with generalizing function
leledumbo
leledumbo_cool at yahoo.co.id
Mon Jun 23 02:30:51 EDT 2008
I've successfully create a function to return lists of N-ple that satisfy the
following function:
x1 + x2 + x3 + ... + xN = C
But unfortunately, it's not generic. The N is supposed to be an input, too.
I don't know how to make a dynamic N-ple (is it possible anyway?).
Currently, here's the implementation:
[code]
findAllAns c = [ (x1,x2,x3,x4,x5) |
x1 <- [0..c],
x2 <- [0..c],
x3 <- [0..c],
x4 <- [0..c],
x5 <- [0..c],
x1 + x2 + x3 + x4 + x5 == c
]
[/code]
I tried using lists of lists, like this:
[code]
findAllAns c n = [ [x] | x <- [0..c], length [x] == n ]
[/code]
but [x] doesn't mean "a list of x", instead it's "a list that contains an x,
where x in [0..c]". Can anyone help me?
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