advent-of-code/2018-12-02.lisp -rw-r--r-- 8.1 KiB View raw
                                                                                
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(defpackage "AOC/2" (:use "CL"))
(in-package "AOC/2")

(defvar *input* "revtoubfniyhzsgxdowjwkqglp
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fevtcubyniyhzsgxdoajwkqmpp
")

(defun make-counts (s)
  (loop for c across s
        with h = (make-hash-table)
        do (incf (gethash c h 0)) finally (return h)))

(defun doublep (h)
  (loop for v being the hash-values of h
        when (= v 2) do (return-from doublep t))
  nil)

(defun triplep (h)
  (loop for v being the hash-values of h
        when (= v 3) do (return-from triplep t))
  nil)

(defun checksum ()
  (with-input-from-string (s *input*)
    (loop for line = (read-line s nil) while line
          with doubles = 0 and triples = 0
          for counts = (make-counts line)
          when (doublep counts) do (incf doubles)
            end
          when (triplep counts) do (incf triples)
            end
          finally
             (return (* doubles triples)))))

(defun drop-char (s i) (concatenate 'string (subseq s 0 i) (subseq s (1+ i))))


(defun find-common ()
  (with-input-from-string (s *input*)
    (loop for line = (read-line s nil) while line
          with v = (coerce (loop for i from 0 below 26
                                 collect (make-hash-table :test 'equal))
                           'vector)
          do (loop for i from 0 below (length line)
                   do (incf (gethash (drop-char line i) (aref v i) 0)))
          finally
             (loop for h across v
                   do (loop for k being the hash-keys in h using (hash-value v)
                            when (= v 2) do (format t "~a" k))))))