CODEWITHSUNDEEP
sortingprolog
MartyIX
MartyIX

Reputation: 28648

How to sort by key AND value in SICStus Prolog?

I have a list like

L = [0-4, 0-3, 3-5, 1-2]

and I would like to sort the list by key and value so the result would be

L = [0-3, 0-4, 1-2, 3-5]

I found keysort but it sorts only by key. I can write the sort by myself but I need an efficient solution.

Upvotes: 0

Views: 486

Answers (1)

CapelliC
CapelliC

Reputation: 60014

call sort/2 (or msort/2 if you want keep duplicates)

?- sort([0-4, 0-3, 3-5, 1-2], S).
S = [0-3, 0-4, 1-2, 3-5].

Upvotes: 1

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