#lang racket

(define/contract (distinct-difference-array nums)
  (-> (listof exact-integer?) (listof exact-integer?))
  (let
    ([len (length nums)])
    (for/list
      ([i (in-range len)])
      (let
        ([head (remove-duplicates (take nums (+ i 1)))]
         [tail (remove-duplicates (drop nums (+ i 1)))])
        (- (length head) (length tail))
        )
     )
    )
  )

(define (main)
  (define (r l e)
    (printf
      "(distinct-difference-array ~a) = ~a | Exp: ~a\n"
      l (distinct-difference-array l) e
      )
    )
  (r '(1 2 3 4 5) '(-3 -1 1 3 5))
  (r '(3 2 3 4 2) '(-2 -1 0 2 3))
  )

(main)