(ns lib)
(use '[clojure.string :only (join split)])


(defn get-smallest-spread [^String filename ]
  (let [lines (split (slurp filename) #"\n")]
    (doseq [line lines]
      (let [columns (split line #"\s{2}")]
        (println (- (Integer. (nth columns 4)) (Integer. (nth columns 3))))))))

(get-smallest-spread "weather.dat")