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36 lines
1000 B
Racket
36 lines
1000 B
Racket
#lang br
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(require racket/file rackunit)
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(define (string->regs str)
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(list->vector (map string->number (string-split str ","))))
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(define (solve regs)
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(define (deref ptr) (vector-ref regs ptr))
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(let loop ([ptr 0])
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(match (vector-ref regs ptr)
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[(and (or 1 2) opcode)
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(vector-set! regs (deref (+ ptr 3))
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((match opcode [1 +][_ *])
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(deref (deref (+ ptr 1)))
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(deref (deref (+ ptr 2)))))
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(loop (+ ptr 4))]
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[99 regs])))
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(define test "1,1,1,4,99,5,6,0,99")
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(check-equal? (solve (string->regs test)) '#(30 1 1 4 2 5 6 0 99))
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(define (nv-result noun verb)
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(define regs (string->regs (file->string "02.rktd")))
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(vector-set*! regs 1 noun 2 verb)
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(vector-ref (solve regs) 0))
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;; 1
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(check-eq? (nv-result 12 2) 6730673)
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;; 2
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(check-eq?
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(for*/first ([noun (in-range 91)]
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[verb (in-range 91)]
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#:when (eq? (nv-result noun verb) 19690720))
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(+ (* 100 noun) verb))
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3749) |