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87 lines
3.0 KiB
Racket
87 lines
3.0 KiB
Racket
#lang br
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(require racket/file rackunit)
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(define (parse-ptr ptr proc)
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(match (for/list ([c (in-string (~r ptr #:min-width 5 #:pad-string "0"))])
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(string->number (string c)))
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[(list d4 d3 d2 d1 d0) (cons (+ (* 10 d1) d0)
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(for/list ([val (list d2 d3 d4)])
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(if (zero? val) proc values)))]))
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(define (string->regs str)
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(list->vector (map string->number (string-split (string-replace str "," " ")))))
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(define (run str starting-input)
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(define regs (string->regs str))
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(define (deref ptr) (vector-ref regs ptr))
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(let loop ([ptr 0])
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(match-define (list opcode mode1 mode2 mode3) (parse-ptr (vector-ref regs ptr) deref))
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(match opcode
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;; add & multiply
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[(or 1 2)
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(vector-set! regs (deref (+ ptr 3))
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((match opcode [1 +][_ *])
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(mode1 (deref (+ ptr 1)))
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(mode2 (deref (+ ptr 2)))))
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(loop (+ ptr 4))]
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;; input
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[3 (vector-set! regs (mode1 (+ ptr 1)) starting-input)
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(loop (+ ptr 2))]
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;; output
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[4 (println (vector-ref regs (mode1 (+ ptr 1))))
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(loop (+ ptr 2))]
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;; jump
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[(or 5 6)
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(if ((match opcode [5 not][_ values]) (zero? (mode1 (deref (+ ptr 1)))))
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(loop (mode2 (deref (+ ptr 2))))
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(loop (+ ptr 3)))]
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;; compare
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[(or 7 8)
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(vector-set! regs (deref (+ ptr 3))
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(if ((match opcode [7 <][_ =]) (mode1 (deref (+ ptr 1))) (mode2 (deref (+ ptr 2))))
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1
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0))
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(loop (+ ptr 4))]
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;; terminate
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[99 (void)]
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[_ (error 'unknown-opcode)])))
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(define-syntax-rule (last-output-line func)
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(last (map string->number (string-split (with-output-to-string (λ () func))))))
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(check-eq? (last-output-line (run "3,0,4,0,99" 42)) 42)
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;; 1
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(check-eq?
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(last-output-line (run (file->string "05.rktd") 1))
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15386262)
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(check-eq? (last-output-line (run "3,9,8,9,10,9,4,9,99,-1,8" 8)) 1)
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(check-eq? (last-output-line (run "3,9,7,9,10,9,4,9,99,-1,8" 8)) 0)
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(check-eq? (last-output-line (run "3,3,1108,-1,8,3,4,3,99" 8)) 1)
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(check-eq? (last-output-line (run "3,3,1107,-1,8,3,4,3,99" 8)) 0)
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(check-eq? (last-output-line (run "3,12,6,12,15,1,13,14,13,4,13,99,-1,0,1,9" 0)) 0)
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(check-eq? (last-output-line (run "3,3,1105,-1,9,1101,0,0,12,4,12,99,1" 0)) 0)
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(check-eq?
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(last-output-line
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(run "3,21,1008,21,8,20,1005,20,22,107,8,21,20,1006,20,31,
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1106,0,36,98,0,0,1002,21,125,20,4,20,1105,1,46,104,
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999,1105,1,46,1101,1000,1,20,4,20,1105,1,46,98,99" 0))
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999)
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(check-eq?
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(last-output-line
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(run "3,21,1008,21,8,20,1005,20,22,107,8,21,20,1006,20,31,
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1106,0,36,98,0,0,1002,21,125,20,4,20,1105,1,46,104,
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999,1105,1,46,1101,1000,1,20,4,20,1105,1,46,98,99" 8))
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1000)
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(check-eq?
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(last-output-line
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(run "3,21,1008,21,8,20,1005,20,22,107,8,21,20,1006,20,31,
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1106,0,36,98,0,0,1002,21,125,20,4,20,1105,1,46,104,
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999,1105,1,46,1101,1000,1,20,4,20,1105,1,46,98,99" 10))
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1001)
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;; 2
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(check-eq?
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(last-output-line (run (file->string "05.rktd") 5))
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10376124) |