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37 lines
835 B
Clojure
37 lines
835 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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(loop [xpos 0 depth 0 aim 0]
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(let [input (read-line)]
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(if (empty? input)
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(println (* xpos depth))
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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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(if (= (first ins) "forward")
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(+ xpos n)
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xpos
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)
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(if (= (first ins) "forward")
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(+ depth (* aim n))
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depth
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)
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(case (first ins)
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"down" (+ aim n)
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"up" (- aim n)
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aim)
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)
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)
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)
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)
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)
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