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by gus_massa
3772 days ago
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The lists are made of cons, but you can make arbitrary trees with cons. After looking carefully, the kpos is the result of the function find. In this case it's a cons with the row and the column of the king. So the code that runs is more like (define kpos (cons 1 2))
(- (cdr kpos) 1)
In this case, for clarity I prefer to use a struct instead of a cons to save the position (struct cell (row col))
(define kpos (cell 1 2))
(- (cell-col kpos) 1)
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