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d07 pt1

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Matthew Butterick 5 years ago
parent cf0060fd67
commit 16e6e2b131
2 changed files with 69 additions and 0 deletions
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68
2019/07.rkt
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#lang br
(require racket/file rackunit)
(define (string->regs str)
(list->vector (map string->number (string-split str #px",\\s*"))))
(define ((binarize proc) x y) (if (proc x y) 1 0))
(define (run str starting-input)
(define regs (string->regs str))
(define (reg-ref ptr) (vector-ref regs ptr))
(define (reg-set! ptr val) (vector-set! regs (reg-ref ptr) val))
(let/ec terminate
(let loop ([ptr 0])
(match-define (list opcode mode-1 mode-2 mode-3)
(match (for/list ([c (in-string (~r (reg-ref ptr) #:min-width 5 #:pad-string "0"))])
(string->number (string c)))
[(list d4 d3 d2 d1 d0) (cons (+ (* 10 d1) d0)
(for/list ([mode-val (list d2 d3 d4)]
[offset '(1 2 3)])
(λ (ptr) ((if (zero? mode-val) reg-ref values) (reg-ref (+ ptr offset))))))]))
(define next-ptr
(match opcode
[(or 1 2 7 8) ; 4-arity: add & multiply & compare
(reg-set! (+ ptr 3) ((match opcode
[1 +]
[2 *]
[7 (binarize <)]
[8 (binarize =)]) (mode-1 ptr) (mode-2 ptr)))
(+ ptr 4)]
[(or 3 4) ; 2-arity: input & output
(match opcode
[3 (reg-set! (+ ptr 1) starting-input)]
[4 (println (mode-1 ptr))])
(+ ptr 2)]
[(or 5 6) ; 3-arity: jump
(if ((match opcode
[5 not]
[6 values]) (zero? (mode-1 ptr)))
(mode-2 ptr)
(+ ptr 3))]
[99 (terminate)]
[_ (error 'unknown-opcode)]))
(loop next-ptr))))
(define-syntax-rule (last-output func)
(last (map string->number (string-split (with-output-to-string (λ () func))))))
(check-eq? (last-output (run "3,0,4,0,99" 42)) 42)
;; 1
(check-eq? (last-output (run (file->string "05.rktd") 1)) 15386262)
(check-eq? (last-output (run "3,9,8,9,10,9,4,9,99,-1,8" 8)) 1)
(check-eq? (last-output (run "3,9,7,9,10,9,4,9,99,-1,8" 8)) 0)
(check-eq? (last-output (run "3,3,1108,-1,8,3,4,3,99" 8)) 1)
(check-eq? (last-output (run "3,3,1107,-1,8,3,4,3,99" 8)) 0)
(check-eq? (last-output (run "3,12,6,12,15,1,13,14,13,4,13,99,-1,0,1,9" 0)) 0)
(check-eq? (last-output (run "3,3,1105,-1,9,1101,0,0,12,4,12,99,1" 0)) 0)
(let ([str "3,21,1008,21,8,20,1005,20,22,107,8,21,20,1006,20,31,
1106,0,36,98,0,0,1002,21,125,20,4,20,1105,1,46,104,
999,1105,1,46,1101,1000,1,20,4,20,1105,1,46,98,99"])
(check-eq? (last-output (run str 0)) 999)
(check-eq? (last-output (run str 8)) 1000)
(check-eq? (last-output (run str 10)) 1001))
;; 2
(check-eq? (last-output (run (file->string "05.rktd") 5)) 10376124)

1
2019/07.rktd
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3,8,1001,8,10,8,105,1,0,0,21,46,67,76,101,118,199,280,361,442,99999,3,9,1002,9,4,9,1001,9,2,9,102,3,9,9,101,3,9,9,102,2,9,9,4,9,99,3,9,1001,9,3,9,102,2,9,9,1001,9,2,9,1002,9,3,9,4,9,99,3,9,101,3,9,9,4,9,99,3,9,1001,9,2,9,1002,9,5,9,101,5,9,9,1002,9,4,9,101,5,9,9,4,9,99,3,9,102,2,9,9,1001,9,5,9,102,2,9,9,4,9,99,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,2,9,9,4,9,3,9,101,1,9,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,102,2,9,9,4,9,3,9,101,2,9,9,4,9,99,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,101,1,9,9,4,9,3,9,101,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,101,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,2,9,9,4,9,99,3,9,1001,9,1,9,4,9,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,101,1,9,9,4,9,3,9,101,2,9,9,4,9,99,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,101,2,9,9,4,9,3,9,101,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,101,1,9,9,4,9,3,9,1001,9,2,9,4,9,99,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,101,2,9,9,4,9,3,9,101,1,9,9,4,9,3,9,101,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,1001,9,2,9,4,9,3,9,101,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,2,9,9,4,9,99