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30 lines
716 B
Clojure
30 lines
716 B
Clojure
; Day 2, part 2
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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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(loop [data {:xpos 0 :depth 0}]
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(let [input (read-line)]
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(if (empty? input)
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(println (apply * (vals data)))
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(let [ins (str/split input #" ")
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n (Integer/parseInt (second ins))
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]
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(recur
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(case (first ins)
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"forward" (update-in data [:xpos] + n)
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"up" (update-in data [:depth] - n)
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"down" (update-in data [:depth] + n)
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)
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)
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)
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)
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)
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)
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