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; Day 2, part 2
; Read a list of instructions from stdin:
; "down X" increases aim number by X,
; "up X" decreases aim by X,
; "forward X" increases xpos by X and depth by (aim * X).
; Print (xpos * depth) after end of data.
;
(require '[clojure.string :as str])
(loop [data {:xpos 0 :depth 0 :aim 0}]
(let [input (read-line)]
(if (empty? input)
(println (apply * (map data [:xpos :depth])))
(let [ins (str/split input #" ")
n (Integer/parseInt (second ins))
]
(recur
(case (first ins)
"forward" (-> data
(update-in [:xpos] + n)
(update-in [:depth] + (* (data :aim) n))
)
"up" (update-in data [:aim] - n)
"down" (update-in data [:aim] + n)
)
)
)
)
)
)
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