Open Juminiy opened 1 year ago
; mit-scheme 没有nil这个概念，这道题本身就是错的 (define (map p sequence) (accumulate (lambda (x y) (cons x (p y)) ) () sequence))
; 序列反了 (define (append seq1 seq2) (accumulate cons seq2 seq1))
; 会报错，参数少一个 (define (length sequence) (accumulate (lambda (x) (+ x 1)) 0 sequence))
; mit-scheme 没有nil这个概念，这道题本身就是错的 (define (map p sequence) (accumulate (lambda (x y) (cons x (p y)) ) () sequence))
; 序列反了 (define (append seq1 seq2) (accumulate cons seq2 seq1))
; 会报错，参数少一个 (define (length sequence) (accumulate (lambda (x) (+ x 1)) 0 sequence))