E. Distance algo

ed.clj

(defn square [x]
  (* x x))

(defn euclidean-distance [p q]
  (Math/sqrt (->> (map - q p) (map square) (reduce +))))

; This formula calculates the distance, which will be smaller for people who are more similar.
; However, you need a function that gives higher values for people who are similar.
; This can be done by adding 1 to the function (so you don’t get a division-by- zero error) and inverting it:

(/ 1 (euclidean-distance([0 1 5 4 5 3 1] [0 0 3 4 5 4 5]))