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day13.lisp
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day13.lisp
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;;;; day13.lisp
(in-package :aoc2019.day13)
(defun count-blocks (board)
(loop :for head := board :then (rest (rest (rest head)))
:while head :count (= (first head) 2)))
(defun day13 ()
(count-blocks (prog-outputs (execute-program! (load-program (first (read-puzzlefile 13)))))))
(defun show-board (board)
(loop for i below (first (array-dimensions board)) do
(loop :for j :below (second (array-dimensions board)) :do
(format t "~a " (aref board i j)))
(format t "~%")))
(defun day13-part2 ()
(let (;(board (make-array '(24 40)))
(score nil)
(ball-xpos nil)
(paddle-xpos nil)
(program (load-program (first (read-puzzlefile 13)) :changes '((0 2)))))
(labels ((parse-prog-output! ()
(loop
:with input := (nreverse (prog-outputs program))
:while input
:for x := (pop input)
:for y := (pop input)
:for tile := (pop input)
:do (case tile
( 3 (setf paddle-xpos x))
( 4 (setf ball-xpos x)))
:if (= -1 x) :do (setf score tile)
;:else :do (setf (aref board y x) tile)
)
(setf (prog-outputs program) nil))
(paddle-move ()
(parse-prog-output!)
;(format t "Block count: ~a~tScore: ~a~%" (loop :for index :from 0 :below (array-total-size board) :count (= 2 (row-major-aref board index))) score)
;(show-board board)
;(format t "Input: ")
(cond
((> ball-xpos paddle-xpos) 1)
((< ball-xpos paddle-xpos) -1)
(t 0))))
(setf (prog-inputs program) #'paddle-move)
(execute-program! program)
(parse-prog-output!)
score)))