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28 lines
784 B
Clojure
28 lines
784 B
Clojure
; Day 2, part 2
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; Read a list of instructions from stdin:
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; "down X" increases aim number by X,
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; "up X" decreases aim by X,
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; "forward X" increases xpos by X and depth by (aim * X).
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; Print (xpos * depth) after end of data.
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;
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(require '[clojure.string :as str])
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(println
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(apply *
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(map
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(reduce
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#(case (first %2)
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"forward" (-> %1 (update :xpos + (second %2))
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(update :depth + (* (%1 :aim) (second %2))))
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"up" (update %1 :aim - (second %2))
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"down" (update %1 :aim + (second %2)))
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{:xpos 0 :depth 0 :aim 0}
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(->> (slurp "./in")
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str/split-lines
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(map #(str/split % #" "))
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(map #(update % 1 read-string))))
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[:xpos :depth]
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)))
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