(defun read-crab (name)
  (flow
    (file-get-string name)
    (tok #/\d+/)
    (mapcar toint)))

(defun calc (input)
  (let* ((mn (find-min input))
         (mx (find-max input))
         (rg (range mn mx))
         (cost (op sum input (op abs (- @1 @@1)))))
    [cost (find-min rg : cost)]))

(defun calc2 (input)
  (let* ((mn (find-min input))
         (mx (find-max input))
         (rg (range mn mx))
         (cost (op sum input (opip (- @@1) abs (* @1 (succ @1)) (trunc @1 2))
                 #;(lambda (x)
                               (let ((n (abs (- x @1))))
                                 (trunc (* n (succ n)) 2))))))
    [cost (find-min rg : cost)]))