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27 lines
686 B
Clojure
27 lines
686 B
Clojure
; Day 2, part 1
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; Read a list of instructions from stdin:
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; "down X" increases depth number by X,
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; "up X" decreases depth by X,
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; "forward X" increases xpos by 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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(reduce *
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(vals
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(reduce
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#(case (first %2)
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"forward" (update %1 :xpos + (second %2))
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"up" (update %1 :depth - (second %2))
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"down" (update %1 :depth + (second %2))
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)
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{:xpos 0 :depth 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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)))))
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