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(ql:quickload '(fiveam uiop cl-ppcre fset lparallel arrows))
(setf lparallel:*kernel* (lparallel:make-kernel 8))
(defparameter *materials* '(:geode :obsidian :clay :ore))
(defun material (string)
(cond
((string= string "ore") :ore)
((string= string "clay") :clay)
((string= string "obsidian") :obsidian)
((string= string "geode") :geode)))
(defun parse-robot-recipe (line)
(cl-ppcre:register-groups-bind ((#'material robot) (#'parse-integer fq) (#'material fm) (#'parse-integer sq) (#'material sm))
("(\\w+) robot costs (\\d+) (\\w+)(?: and (\\d+) (\\w+))?" line)
(let ((first-material (fset:with (fset:empty-bag) fm fq)))
(fset:map (robot
(if sm (fset:with first-material sm sq)
first-material))))))
(defun can-build-robot-pm (requirements resources)
(fset:subbag? requirements resources))
(defun consume (requirements resources)
(fset:bag-difference resources requirements))
(defun material-collect (robots resources)
(fset:bag-sum robots resources))
(defun resource-increase (current-state time-left)
(destructuring-bind (robots resources) current-state
(reduce (lambda (acc material)
(fset:with acc material
(* time-left (fset:multiplicity robots material))))
*materials*
:initial-value resources)))
(defun bot-requirements (type recipes)
(fset:lookup recipes type))
(defun build-robot (type robots resources recipes)
(let ((req (bot-requirements type recipes)))
(when (can-build-robot-pm req resources)
(let ((new-robots (fset:with robots type))
(resources-left (consume req resources)))
(values new-robots (material-collect robots resources-left))))))
(defun max-cost (recipes)
(fset:reduce
(lambda (acc key value)
(declare (ignore key))
(fset:union value acc))
recipes
:initial-value (fset:empty-bag)))
(defun can-build (bots)
(append
(list :clay :ore)
(when (plusp (fset:multiplicity bots :clay)) (list :obsidian))
(when (plusp (fset:multiplicity bots :obsidian)) (list :geode))))
(defun propose-builds (bots max-costs)
(loop for try in (can-build bots)
when (or (eq :geode try)
(< (fset:multiplicity bots try) ;; every cycle I not yet produce
(fset:multiplicity max-costs try))) ;; enough for any build
collect try))
(defun probe (current-state recipes max-cost)
(destructuring-bind (robots resources) current-state
(reduce
(lambda (acc bot-type)
(multiple-value-bind (new-robots new-resources)
(build-robot bot-type robots resources recipes)
(if new-robots (fset:with acc (list new-robots new-resources)) acc)))
(propose-builds robots max-cost)
:initial-value (fset:set (list robots (material-collect robots resources))))))
(defun advance (robot-resource-seq blueprints max-cost)
(fset:reduce
(lambda (new-states current-state)
(fset:union new-states
(probe current-state blueprints max-cost)))
robot-resource-seq
:initial-value (fset:empty-set)))
(defun materials> (m1 m2)
(eq :greater
(reduce (lambda (result material)
(if (eq result :equal)
(let ((c1 (fset:multiplicity m1 material))
(c2 (fset:multiplicity m2 material)))
(cond
((< c1 c2) :less)
((= c1 c2) :equal)
((> c1 c2) :greater)))
result))
*materials*
:initial-value :equal)))
(defun leading-configs (robot-resource-seq time-left truncate)
;; (format t "~a~%" (fset:size robot-resource-seq))
(fset:subseq
(fset:sort robot-resource-seq
#'materials> :key (lambda (state) (resource-increase state time-left)))
0 truncate))
(defun find-best (robot-resource-seq blueprints time-left &optional (state-truncation 1024) (max-cost (max-cost blueprints)))
(if (zerop time-left)
(arrows:-> robot-resource-seq
;; (fset:subseq 0 3)
(fset:first)
(cadr)
(fset:multiplicity :geode))
(find-best (leading-configs
(advance robot-resource-seq blueprints max-cost)
(1- time-left) state-truncation)
blueprints (1- time-left)
state-truncation
max-cost)))
(defun get-blueprints (filename)
(mapcar
(lambda (l)
(let ((blueprint (uiop:split-string l :separator ":.")))
(reduce #'fset:map-union
(mapcar #'parse-robot-recipe (butlast (cdr blueprint))))))
(uiop:read-file-lines filename)))
(defun solver (blueprints time-left)
(lparallel:pmap 'list
(lambda (recipes)
(find-best (fset:seq (list (fset:bag :ore) (fset:empty-bag)))
recipes time-left 1024))
blueprints))
(defun part1 (blueprints time-left)
(loop for geodes in (solver blueprints time-left)
for idx from 1
sum (* idx geodes)))
(defun part2 (blueprints time-left)
(apply #'* (solver blueprints time-left)))
(fiveam:test solution
;; part1
(fiveam:is (= 33 (part1 (get-blueprints "eg-in") 24)))
(fiveam:is (= 1266 (part1 (get-blueprints "input") 24)))
;; part1
(fiveam:is (= 3472 (part2 (get-blueprints "eg-in") 32)))
(fiveam:is (= 5800 (part2 (subseq (get-blueprints "input") 0 3) 32))))
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