33 lines
809 B
Racket
33 lines
809 B
Racket
; 1
|
|
; 1 1
|
|
; 1 2 1
|
|
; 1 3 3 1
|
|
; 1 4 6 4 1
|
|
; . . . .
|
|
; I am sure that I have chosen the worst possible way
|
|
|
|
(define (pasc-step row col num curr-row curr-col)
|
|
(cond
|
|
((or (< col 0) (> col row)) 0)
|
|
((or (= col 1) (= col row)) 1)
|
|
((= curr-row row) num)
|
|
((or (= col 2) (= col (- row 1))) (- row 1))
|
|
((or (> col 2) (< col (- row 1))) (pasc-step
|
|
row
|
|
col
|
|
(+ num (if (< curr-col col)
|
|
(pasc-step curr-row (+ curr-col 1) 1 2 2)
|
|
(pasc-step curr-row (- curr-col 1) 1 2 2)))
|
|
(+ curr-row 1)
|
|
(if (< curr-col col) (+ curr-col 1) curr-col)))))
|
|
|
|
(define (locate-pasc row col)
|
|
(pasc-step row col 1 2 2))
|
|
|
|
(locate-pasc 2 1)
|
|
(locate-pasc 3 2)
|
|
(locate-pasc 4 3)
|
|
(locate-pasc 5 2)
|
|
(locate-pasc 5 4)
|
|
(locate-pasc 6 4)
|
|
(locate-pasc 7 3) |