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(in-package :aoc/2024)
(ql:quickload "cl-ppcre")
(defparameter *input/d3*
(asdf:system-relative-pathname :advent "2024/d03.input"))
(defun readfile (filename)
(let ((lines '()))
(with-open-file (stream filename :direction :input)
(loop for line = (read-line stream nil nil)
while line
do (push line lines)))
(nreverse lines)))
(defun replace-with-prefix-expr (match)
(ppcre:regex-replace "mul\\(([0-9]+),([0-9]+)\\)" match "(* \\1 \\2)"))
(print
(apply '+
(mapcar 'eval
(mapcar #'read-from-string
(mapcar #'replace-with-prefix-expr
(ppcre:all-matches-as-strings "mul\\(([0-9]+),([0-9]+)\\)"
(format nil "~{~a~}" (readfile *input/d3*))))))))
; 1795571322
(print
(apply '+
(mapcar 'eval
(mapcar #'read-from-string
(mapcar #'replace-with-prefix-expr
(ppcre:all-matches-as-strings "mul\\(([0-9]+),([0-9]+)\\)"
(ppcre:regex-replace-all "don't\\(\\).*?(do\\(\\)|$)"
(format nil "~{~a~}" (readfile *input/d3*))
"")))))))
; 103811193
|
