44 lines
1.6 KiB
Common Lisp
44 lines
1.6 KiB
Common Lisp
(declaim (optimize (speed 3) (safety 0) (debug 0)))
|
|
|
|
(defconstant +loop-count+ 1000000)
|
|
(defconstant +expected-checksum+ 4600001)
|
|
(defparameter +words+ #("alpha" "omega" "delta" "omega" "sigma"))
|
|
|
|
(declaim (ftype (function () fixnum) configured-loop-count))
|
|
(defun configured-loop-count ()
|
|
(handler-case
|
|
(let ((line (read-line *standard-input* nil nil)))
|
|
(if line
|
|
(let ((value (parse-integer line :junk-allowed t)))
|
|
(if (> value 0) value +loop-count+))
|
|
+loop-count+))
|
|
(error () +loop-count+)))
|
|
|
|
(declaim (ftype (function () string) configured-target))
|
|
(defun configured-target ()
|
|
(or (second sb-ext:*posix-argv*) "omega"))
|
|
|
|
(declaim (ftype (function (fixnum string) fixnum) string-eq-loop))
|
|
(defun string-eq-loop (limit target)
|
|
(declare (type fixnum limit)
|
|
(type string target))
|
|
(loop with i of-type fixnum = 0
|
|
with acc of-type fixnum = 1
|
|
while (< i limit)
|
|
do (let* ((current (svref +words+ (rem i 5)))
|
|
(next (if (string= current target)
|
|
(+ acc 7)
|
|
(+ acc 3)))
|
|
(bounded (if (> next 1000000000)
|
|
(- next 1000000000)
|
|
next)))
|
|
(declare (type string current)
|
|
(type fixnum next bounded))
|
|
(setf acc bounded
|
|
i (+ i 1)))
|
|
finally (return acc)))
|
|
|
|
(let ((result (string-eq-loop (configured-loop-count) (configured-target))))
|
|
(format t "~D~%" result)
|
|
(sb-ext:exit :code (if (= result +expected-checksum+) 0 1)))
|