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