From 7406aa3ec89d17427ac1d6920aa0ceab0d722320 Mon Sep 17 00:00:00 2001
From: Oscar Najera <hi@oscarnajera.com>
Date: Sun, 3 Dec 2023 18:22:58 +0100
Subject: fix second instance

---
 AoC2023/day01/solver.lisp | 38 +++++++++++++++-----------------------
 1 file changed, 15 insertions(+), 23 deletions(-)

(limited to 'AoC2023')

diff --git a/AoC2023/day01/solver.lisp b/AoC2023/day01/solver.lisp
index 443bcc0..2ab61e1 100644
--- a/AoC2023/day01/solver.lisp
+++ b/AoC2023/day01/solver.lisp
@@ -14,15 +14,10 @@ zoneight234
 7pqrstsixteen")
 
 (defun get-pair (string)
-  (loop with first and last and num = 0
-        for c across string
-        when (digit-char-p c)
-          do (progn (setf last c)
-                    (when (= 1 (incf num))
-                      (setf first c)))
-        finally (return
-                  (parse-integer
-                   (concatenate 'string (list first last))))))
+  (parse-integer
+   (concatenate 'string (list
+                         (find-if #'digit-char-p string)
+                         (find-if #'digit-char-p string :from-end t)))))
 
 (defun translate (word)
   (alexandria:eswitch (word :test (lambda (val opts) (member val opts :test #'string-equal)))
@@ -36,13 +31,14 @@ zoneight234
     ('("8" "eight") 8)
     ('("9" "nine") 9)))
 
-(defparameter numbers-re "[1-9]|one|two|three|four|five|six|seven|eight|nine")
+(defparameter numbers-re "one|two|three|four|five|six|seven|eight|nine")
 
 (defun line-value (string)
-  (let ((res
-          (mapcar #'translate
-                  (cl-ppcre:all-matches-as-strings numbers-re string))))
-    (+ (* 10 (car res)) (car (last res)))))
+  (let ((first (cl-ppcre:scan-to-strings (format nil "[1-9]|~a" numbers-re) string))
+        (last  (reverse (cl-ppcre:scan-to-strings (format nil "[1-9]|~a" (reverse numbers-re)) (reverse string)))))
+    (+ (* 10 (translate first)) (translate last))))
+
+(cl-ppcre:scan-to-strings (reverse numbers-re) (reverse "4nineeightseven2"))
 
 (defun solver1 (lines)
   (reduce #'+ lines :key #'get-pair))
@@ -54,18 +50,14 @@ zoneight234
   (fiveam:is
    (= 142
       (solver1 (uiop:split-string eg-input :separator '(#\Newline)))))
-  (fiveam:is
-   (= 55172
-      (solver1 (uiop:read-file-lines "input"))))
   (fiveam:is
    (= 281
       (solver2 (uiop:split-string eg-input2 :separator '(#\Newline)))))
   (fiveam:is
-   (= 54953
+   (= 55172
+      (solver1 (uiop:read-file-lines "input"))))
+  (fiveam:is (= 41 (line-value "46jtwonen")))
+  (fiveam:is
+   (= 54925
       (solver2 (uiop:read-file-lines "input")))))
 
-(uiop:with-output-file (sol "solut")
-  (let ((ser 0))
-    (loop for line in (uiop:read-file-lines "input")
-          for val = (line-value line) do
-            (format sol "~d ~d ~a~%" (incf ser val) val line))))
-- 
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