Question

I am new to Prolog.

I need help writing a predicate which finds and deletes the minimum element in a list.

Thank you very much!

Answer 1

Let me google it for you.

How could you find a minimum of a list..

Anyway, there is a nice min_list predicate.

?- min_list([1,2,2,3],X).
X = 1.

Here is a little example how could you remove some element from a list (notice, that all 2s is gone):

?- delete([1,2,2,3],2,X).
X = [1, 3].

If you wanna remove only first occasion of a element, use select:

?- select(2, [2,1,2,2,3], X), !.
X = [1, 2, 2, 3].

So your final answer could be something like that:

delete_min(A, C) :-
  min_list(A, B),
  select(B, A, C), !.

And

?- delete_min([1,1,2,3],X).
X = [1, 2, 3].