sorting - How to sort by key AND value in SICStus Prolog? -


i have list like

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

and sort list key , value result be

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

i found keysort sorts key. can write sort myself need efficient solution.

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

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

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