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Ingy döt Net 2026-02-01 16:33:20 -08:00
parent 5150844a7d
commit 4bb20c9b71
7735 changed files with 38060 additions and 199180 deletions
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62
Task/Dijkstras-algorithm/Emacs-Lisp/dijkstras-algorithm.l
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(defvar path-list '((a b 7)
(a c 9)
(a f 14)
(b c 10)
(b d 15)
(c d 11)
(c f 2)
(d e 6)
(e f 9)))
(defun calculate-shortest-path (path-list)
(let (shortest-path)
(dolist (path path-list)
(add-to-list 'shortest-path (list (nth 0 path)
(nth 1 path)
nil
(nth 2 path))
't))
(dolist (path path-list)
(dolist (short-path shortest-path)
(when (equal (nth 0 path) (nth 1 short-path))
(let ((test-path (list (nth 0 short-path)
(nth 1 path)
(nth 0 path)
(+ (nth 2 path) (nth 3 short-path))))
is-path-found)
(dolist (short-path1 shortest-path)
(when (equal (seq-take test-path 2)
(seq-take short-path1 2))
(setq is-path-found 't)
(when (> (nth 3 short-path1) (nth 3 test-path))
(setcdr (cdr short-path1) (cddr test-path)))))
(when (not is-path-found)
(add-to-list 'shortest-path test-path 't))))))
shortest-path))
(defun find-shortest-route (from to path-list)
(let ((shortest-path-list (calculate-shortest-path path-list))
point-list matched-path distance)
(add-to-list 'point-list to)
(setq matched-path
(seq-find (lambda (path) (equal (list from to) (seq-take path 2)))
shortest-path-list))
(setq distance (nth 3 matched-path))
(while (nth 2 matched-path)
(add-to-list 'point-list (nth 2 matched-path))
(setq to (nth 2 matched-path))
(setq matched-path
(seq-find (lambda (path) (equal (list from to) (seq-take path 2)))
shortest-path-list)))
(if matched-path
(progn
(add-to-list 'point-list from)
(list 'route point-list 'distance distance))
nil)))
(format "%S" (find-shortest-route 'a 'e path-list))