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(ql:quickload '(fiveam cl-ppcre uiop arrows))
(defun data (filename)
(with-open-file (in filename)
(loop for line = (read-line in nil nil)
while line
collect (cl-ppcre:register-groups-bind (val (#'parse-integer flow) others)
("Valve (\\w+) has flow rate=(\\d+); tunnels? leads? to valves? (.+)" line)
`(,(intern val) ,flow ,@(mapcar #'intern (cl-ppcre:split ", " others)))))))
(defun next-steps (current graph paths)
(flet ((appropriate (next)
(and (not (gethash next paths)) ;; not visited
(setf (gethash next paths) (cons next (gethash current paths))))))
(remove-if-not #'appropriate
;; name flow connections -> cddr
(cddr (assoc current graph :test #'eq)))))
(defun shortest-path (graph from to)
(let ((paths (make-hash-table :test #'eq)))
(setf (gethash from paths) (list from))
(labels ((traverse (queue paths)
(unless (null queue)
(let ((next (next-steps (car queue) graph paths)))
(unless (member to next :test #'eq)
(traverse (append (cdr queue) next) paths))))))
(traverse (list from) paths))
;; (loop for k being the hash-keys in paths using (hash-value v)
;; do (format t "~a=>~a~%" k v))
(gethash to paths)))
(defun worthwhile-graph (graph)
(let ((interesting (remove-if #'zerop graph :key #'cadr)))
(loop for (from flow) in (cons '(aa 0) interesting)
for label from 0
collect (apply #'list (ash 1 label) from flow
(loop for (to) in interesting
for target-label from 1
when (not (eq from to))
collect (cons (ash 1 target-label) (1- (length (shortest-path graph from to)))))))))
(defun travel-time (path graph)
(loop for (from to) on path
while to
for neighbors = (cddr (assoc from graph :test #'eq))
for distance = (cdr (assoc to neighbors :test #'eq))
sum (1+ distance) into runtime
collect runtime))
(defun path-release-as (path graph start-time)
(loop for (from to) on path
while to
for neighbors = (cddr (assoc from graph :test #'eq))
for flow = (cadr (assoc to graph :test #'eq))
for distance = (cdr (assoc to neighbors :test #'eq))
sum (1+ distance) into runtime
sum (* flow (- start-time runtime)) into release
finally (return release)))
(defun path-release (path graph start-time)
(loop for (from to) on path
for node-from = (rassoc from graph :key #'car) then node-to
and node-to = (rassoc to graph :key #'car)
while node-to
for neighbors = (cdddr node-from)
for flow = (caddr node-to)
for distance = (cdr (assoc (car node-to) neighbors :test #'eq))
sum (1+ distance) into runtime
sum (* flow (- start-time runtime)) into release
finally (return release)))
;; (shortest-path (data "eg-in") 'AA 'CC)
(fiveam:test loads
(fiveam:is
(= 1648 (path-release '(AA DD JJ BB CC HH EE) (worthwhile-graph (data "eg-in")) 30)))
(fiveam:is
(= 1651 (path-release '(AA DD BB JJ HH EE CC) (worthwhile-graph (data "eg-in")) 30)))
(fiveam:is
(= 560 (path-release '(AA DD) (worthwhile-graph (data "eg-in")) 30))))
(defun path-release2 (paths graph start-time)
(reduce #'+ paths
:key (lambda (path) (path-release path graph start-time))))
(path-release '(AA DD) (worthwhile-graph (data "eg-in")) 26)
(path-release '(AA DD EE) (worthwhile-graph (data "eg-in")) 26)
(path-release '(AA DD HH EE) (worthwhile-graph (data "eg-in")) 12)
(path-release '(AA DD EE HH) (worthwhile-graph (data "eg-in")) 12)
(path-release2 '((AA NU WK NC ZG EA CX QC) (AA RA XK YH NM YP XS)) (worthwhile-graph (data "input")) 26)
(path-release2 '((AA NU WK NC ZG EA CX QC) (AA XK YH NM YP XS)) (worthwhile-graph (data "input")) 26)
;; (travel-time
;; ;; '(AA NU WK NC ZG XK YH NM YP)
;; ;; '(AA NU WK NC ZG EA CX QC)
;; '(AA RA XK YH NM YP XS)
;; (worthwhile-graph (data "input")))
(defun accumulated-flow (actor-paths)
(reduce #'+ actor-paths :key #'caddr))
(defun traverse (graph actor open best-flow)
(if (loop for ac in actor
:always (zerop (cadr ac)))
(mapcar (lambda (a) (cons (reverse (car a)) (cdr a))) actor)
(destructuring-bind (path time-left previous-flow) (car actor)
(let* ((current-options (assoc (car path) graph :test #'=))
(travel-times (cdddr current-options))
(flow-released (caddr current-options))
(current-flow (+ previous-flow (* flow-released time-left)))
(next
(loop for (node . time-there) in travel-times
:when (and (not (logtest node open))
(let ((time-left (- time-left time-there 1)))
(when (plusp time-left)
(cons node (list (list (cons node path) time-left current-flow))))))
:collect it)))
(if (null next)
(traverse graph
(append (cdr actor)
(list (list path 0 current-flow)))
open best-flow)
(reduce
(lambda (acc term)
(let* ((acc-flow (accumulated-flow acc))
(next-actors
(destructuring-bind (node . actor-next-move) term
(traverse graph
(append (cdr actor) actor-next-move)
(logior node open)
acc))))
(if (>= acc-flow (accumulated-flow next-actors))
acc next-actors)))
next :initial-value best-flow))))))
(defun solver (filename start-time actors)
(let* ((action-graph (worthwhile-graph (data filename)))
(actor (loop repeat actors collect `((1) ,start-time 0))))
(traverse action-graph actor 1 nil)))
(fiveam:test solutions
(fiveam:is
(= 1651 (accumulated-flow (solver "eg-in" 30 1))))
(fiveam:is
(= 1754 (accumulated-flow (solver "input" 30 1))))
(fiveam:is
(= 1707 (accumulated-flow (solver "eg-in" 26 2))))
(fiveam:is
(= 2474 (accumulated-flow (solver "input" 26 2)))))
;; (require :sb-sprof)
;; (sb-sprof:with-profiling (:max-samples 1000
;; :report :flat
;; :loop t
;; :show-progress t)
;; (solver "input" 19 2))
;; (time (solver "input" 19 2))
;; (length (worthwhile-graph (data "input")))
;; (loop for (name flow . neighbors) in (worthwhile-graph (data "input"))
;; do (loop for (nn . dist) in neighbors
;; do (format t "~a -> ~a [label=\"~d\"]~%" name nn dist)))
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