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