Prolog recrusive Algorithm

Question

foo(0,Y,Z) :- Z is Y.
foo(X,0,Z) :- Z is X.
foo(X,Y,Z) :- X>=Y, M1 is X-2, foo(M1, Y, Zx), Z is Zx + Y.
foo(X,Y,Z) :- Y<X, N1 is Y-3, foo(X, N1, Zx), Z is Zx + X.

So this is my program and this is what i'm trying to accomplish

标签： algorithm recursion prolog

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Answer 1

I remember that in your function is

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