Question

我有一个问题：

如何为迷宫执行查找谓词。给出一个实验室：

[[[down,left,up],[left,down,up],[right,up],[up],[,up],[right,left,up]],
[[left,down],[down,up],[down,up],[],[down],[right,down]],
[[left,up],[down,up],[down,up],[down],[down,up],[right,down,up]],
[[right,left],[left,up],[up],[up],[up],[right,up]],
[[left,down],[right,down],[left,down],[down],[down],[right,down]]]

我需要定义一种在Labryinth数据结构中查找单元格的方法（Andrew Rice sugestion）

 lookup(Lab,(X,Y),Walls)

我已经有了第n个：

nth(1,[H|T],H).
nth(N,[_|T],R) :- M is N-1, nth(M,T,R).

现在我的查询：

lookup(Lab, (X, Y), Walls) :-
    nth(Y, Lab, R),
    nth(X, Lab, Y1),

这是对的吗？

EDIT !!!

我的代码：

nth(1,[H|_],H).
nth(N,[_|_],R) :- 
    M is N-1,
    nth(M,_,R).

lookup(Lab, (X, Y), Walls) :-
    Y1 is nth(Y, Lab, _),
    Y == Y1,
    X1 is nth(X, Lab, Y1),
    X1 == Walls.


calc(up,(X,Y1),(X,Y2)) :- 
    Y2 is Y1-1.
calc(down,(X,Y1),(X,Y2)) :- 
    Y2 is Y1+1.
calc(left,(X1,Y),(X2,Y)) :- 
    X2 is X1-1. 
calc(right,(X1,Y),(X2,Y)) :- 
    X2 is X1+1.

map_calc(_,[],[]).
map_calc((X,Y),[H|T],[(H,X1,Y1)|S]) :- 
    calc(H,(X,Y),(X1,Y1)),
    map_calc((X,Y),T,S).

我的possible_moves：

movs_possiveis(Lab, (X,Y), Movs, Poss) :- 
lookup(Lab, (X,Y), Walls),
\+memberchk(Movs),
map_calc((X,Y), Walls, Poss).

这是对的吗？

由于

Prolog迷宫：查找谓词

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