这是一个程序,它接收一个坐标列表ex:[e(1,2,3),e(4,5,6)]。制定动态,划分和征服,将列表分成两半 半递归, 当你有一个转换值的元组中的坐标。 问题是它处于无限循环中。
resuelve([X],D):-tuples([X],D).
resuelve(Xs,D):-
length(Xs,L), %length of the list
divideIzq(Xs,L,Xa), %divide the left half
divideDer(Xs,L,Xb), %divide the rigth half
resuelve(Xa,D1), %left recursively
resuelve(Xb,D2), %rigth recursively
append_(D1,D2,D). %concatenate tuples result
%function that transforms the coordinates
tuples([e(X,Y,Z)],D) :- D = [c(X,Z),c(Y,0)].
divideIzq(Xs,L1,D):-
L is div(L1, 2),
take(L,Xs,D).
divideDer(Xs,L1,D):-
L is div(L1, 2),
drop(L,Xs,D).
drop(0,LastElements,LastElements) :- !.
drop(N,[_|Tail],LastElements) :-
N > 0,
N1 is N - 1,
drop(N1,Tail,LastElements).
take(0, _, []) :- !.
take(N, [H|TA], [H|TB]) :-
N > 0,
N2 is N - 1,
take(N2, TA, TB).
append_([], Cs, Cs).
append_([A|As],Bs,[A|Cs]):-
append_(As, Bs, Cs).
示例:
% resuelve([e(3,6,5),e(4,9,3),e(8,11,2),e(10,12,4)], D).
% D = [c(3, 5), c(6, 0), c(4, 3), c(9, 0), c(8, 2), c(11, 0), c(10, 4), c(12, 0)]
由于
答案 0 :(得分:0)
就绪!
问题出在第一行:
resuelve([X],D):-tuples([X],D) , !.
是必要的砍树。
感谢您的帮助!