1 12687dd9 2023-08-04 jrmu ;; The first three lines of this file were inserted by DrScheme. They record metadata
 2 12687dd9 2023-08-04 jrmu ;; about the language level of this file in a form that our tools can easily process.
 3 12687dd9 2023-08-04 jrmu #reader(lib "htdp-advanced-reader.ss" "lang")((modname |29.3|) (read-case-sensitive #t) (teachpacks ((lib "draw.ss" "teachpack" "htdp") (lib "arrow.ss" "teachpack" "htdp") (lib "gui.ss" "teachpack" "htdp"))) (htdp-settings #(#t constructor repeating-decimal #t #t none #f ((lib "draw.ss" "teachpack" "htdp") (lib "arrow.ss" "teachpack" "htdp") (lib "gui.ss" "teachpack" "htdp")))))
 4 12687dd9 2023-08-04 jrmu (define (find-route1 ori dest G)
 5 12687dd9 2023-08-04 jrmu   (local ((define (find-route ori dest G)
 6 12687dd9 2023-08-04 jrmu             (cond
 7 12687dd9 2023-08-04 jrmu               [(symbol=? ori dest) (list ori)]
 8 12687dd9 2023-08-04 jrmu               [else (local ((define possible-route (find-route/list (neighbors ori G) dest G)))
 9 12687dd9 2023-08-04 jrmu                       (cond
10 12687dd9 2023-08-04 jrmu                         [(boolean? possible-route) false]
11 12687dd9 2023-08-04 jrmu                         [else (cons ori possible-route)]))]))
12 12687dd9 2023-08-04 jrmu           (define (find-route/list lo-ori dest G)
13 12687dd9 2023-08-04 jrmu             (cond
14 12687dd9 2023-08-04 jrmu               [(empty? lo-ori) false]
15 12687dd9 2023-08-04 jrmu               [else (local ((define possible-route (find-route (first lo-ori) dest G)))
16 12687dd9 2023-08-04 jrmu                       (cond [(boolean? possible-route) (find-route/list (rest lo-ori) dest G)]
17 12687dd9 2023-08-04 jrmu                             [else possible-route]))]))
18 12687dd9 2023-08-04 jrmu           (define (neighbors anode G)
19 12687dd9 2023-08-04 jrmu             (first (rest (assf (lambda (x) (equal? anode x)) G)))))
20 12687dd9 2023-08-04 jrmu     find-route ori dest G))
21 12687dd9 2023-08-04 jrmu 
22 12687dd9 2023-08-04 jrmu (define (neighbors anode agraph)
23 12687dd9 2023-08-04 jrmu   (vector-ref agraph anode)) 
24 12687dd9 2023-08-04 jrmu 
25 12687dd9 2023-08-04 jrmu 
26 12687dd9 2023-08-04 jrmu (define G (vector '(1 4)
27 12687dd9 2023-08-04 jrmu                   '(4 5)
28 12687dd9 2023-08-04 jrmu                   '(3)
29 12687dd9 2023-08-04 jrmu                   empty
30 12687dd9 2023-08-04 jrmu                   '(2 5)
31 12687dd9 2023-08-04 jrmu                   '(3 6)
32 12687dd9 2023-08-04 jrmu                   empty))
33 12687dd9 2023-08-04 jrmu 
34 12687dd9 2023-08-04 jrmu ;find-route : node node graph -> (listof nodes)
35 12687dd9 2023-08-04 jrmu ;Find a route from ori to dest given G and return the route as a (listof nodes).
36 12687dd9 2023-08-04 jrmu 
37 12687dd9 2023-08-04 jrmu (define (find-route ori dest G)
38 12687dd9 2023-08-04 jrmu   (cond
39 12687dd9 2023-08-04 jrmu     [(= ori dest) (list ori)]
40 12687dd9 2023-08-04 jrmu     [else (local ((define possible-route (find-route/list (neighbors ori G) dest G)))
41 12687dd9 2023-08-04 jrmu             (cond [(boolean? possible-route) false]
42 12687dd9 2023-08-04 jrmu                   [else (cons ori possible-route)]))]))
43 12687dd9 2023-08-04 jrmu 
44 12687dd9 2023-08-04 jrmu ;find-route/list : (listof nodes) node graph -> (listof nodes)
45 12687dd9 2023-08-04 jrmu ;Find a route from lo-ori (listof nodes) to dest given G and return the route as a (listof nodes).
46 12687dd9 2023-08-04 jrmu 
47 12687dd9 2023-08-04 jrmu (define (find-route/list lo-ori dest G)
48 12687dd9 2023-08-04 jrmu   (cond
49 12687dd9 2023-08-04 jrmu     [(empty? lo-ori) false]
50 12687dd9 2023-08-04 jrmu     [else (local ((define possible-route (find-route (first lo-ori) dest G)))
51 12687dd9 2023-08-04 jrmu             (cond
52 12687dd9 2023-08-04 jrmu               [(boolean? possible-route) (find-route/list (rest lo-ori) dest G)]
53 12687dd9 2023-08-04 jrmu               [else possible-route]))]))