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day 2

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daniel committed 2021-12-02 12:13:59 +01:00
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day-2.input
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forward 8
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forward 2
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up 3
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forward 3
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forward 2
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down 1
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forward 5
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forward 8
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down 2
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forward 2
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forward 3
down 2
forward 5
down 2
down 1
up 4
up 5
up 9
forward 1
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down 9
up 8
forward 9
forward 7
down 9
down 2
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forward 9
forward 7
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forward 6
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forward 5
forward 6
down 4
forward 8
forward 5
forward 2
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forward 1
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up 3
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forward 5
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up 3
up 1
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up 4
down 1
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forward 8
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forward 7
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up 5
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down 3
forward 2
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forward 6
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up 2
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forward 6
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up 3
up 4
forward 8
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forward 5
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forward 2
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down 7
down 5
down 4
up 3
forward 7
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forward 9
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up 6
down 1
forward 3
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forward 1
down 8
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down 3
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up 3
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down 2
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down 3
forward 2
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down 6
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forward 8
forward 2
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forward 4
up 2
forward 3
up 8
forward 7
forward 4
down 8
down 3
down 4
up 8
forward 5
forward 3
up 4
up 2
down 6
forward 4
up 8
up 3
up 8
down 3
up 1
forward 2
down 4
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down 9
down 5
forward 9
up 6
up 5
down 8
down 6
down 7
forward 8
forward 4
up 4
forward 1
down 4
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down 9
up 6
down 9
up 3
forward 4
down 1
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down 5
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forward 4
down 8
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forward 2
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forward 5
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down 4
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up 5
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forward 1
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down 1
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up 3
forward 5
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down 6
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forward 2
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forward 1
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forward 3
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down 3
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up 2
forward 8
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forward 5
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forward 8
down 1
forward 2
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forward 5
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forward 3
down 1
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down 2
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forward 7
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forward 3
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forward 4
down 2
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forward 8
down 5
forward 3
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forward 5
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down 5
forward 7
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up 1
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forward 3
forward 1
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forward 7
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down 7
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down 1
down 3
up 6
forward 2
down 5
forward 1
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forward 2
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forward 7
forward 5
forward 1
forward 7
forward 3
down 2
up 8
up 4
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down 2
down 1
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down 3
forward 2
up 1
forward 8
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day-2.scm
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(define (get-word text-port)
(let loop [(w '())]
(let [(c (get-char text-port))]
(if (or (eof-object? c) (char-whitespace? c))
(list->string (reverse w))
(loop (cons c w))))))
(let [(file (open-input-file "day-2.input"))]
(let loop [(x 0) (y 0)]
(let [(amount (string->number (get-word file)))
(move (get-word file))]
(cond
((string=? move "forward")
(loop (+ x amount) y))
((string=? move "down")
(loop x (+ y amount)))
((string=? move "up")
(loop x (- y amount)))
(else
(display "part 1: ")
(display (* x y))
(newline))))))
(let [(file (open-input-file "day-2.input"))]
(let loop [(x 0) (y 0) (aim 0)]
(let [(amount (string->number (get-word file)))
(move (get-word file))]
(cond
((string=? move "forward")
(loop
(+ x amount)
(+ y (* aim amount))
aim))
((string=? move "down")
(loop x y (+ aim amount)))
((string=? move "up")
(loop x y (- aim amount)))
(else
(display "part 2: ")
(display (* x y))
(newline))))))