34 lines
1.1 KiB
Common Lisp
34 lines
1.1 KiB
Common Lisp
(declaim (optimize (speed 3) (safety 0) (debug 0)))
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(defconstant +loop-count+ 1000000)
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(defconstant +expected-checksum+ 5000001)
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(declaim (ftype (function () fixnum) configured-loop-count))
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(defun configured-loop-count ()
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(handler-case
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(let ((line (read-line *standard-input* nil nil)))
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(if line
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(let ((value (parse-integer line :junk-allowed t)))
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(if (> value 0) value +loop-count+))
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+loop-count+))
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(error () +loop-count+)))
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(declaim (ftype (function (fixnum) fixnum) math-loop))
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(defun math-loop (limit)
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(declare (type fixnum limit))
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(loop with i of-type fixnum = 0
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with acc of-type fixnum = 1
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while (< i limit)
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do (let* ((next (+ acc (* (+ i 3) 2)))
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(bounded (if (> next 1000000000)
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(- next 1000000000)
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next)))
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(declare (type fixnum next bounded))
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(setf acc bounded
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i (+ i 1)))
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finally (return acc)))
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(let ((result (math-loop (configured-loop-count))))
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(format t "~D~%" result)
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(sb-ext:exit :code (if (= result +expected-checksum+) 0 1)))
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