refactor advent of code 2023 day 01 from c to racket

1 files changed, 22 insertions, 0 deletions

diff --git a/advent-of-code/2023/01/part1.rkt b/advent-of-code/2023/01/part1.rkt
new file mode 100644
index 0000000..0c69be5
--- /dev/null
+++ b/advent-of-code/2023/01/part1.rkt
@@ -0,0 +1,22 @@
+#lang racket
+
+(define fp (open-input-file "input"))
+(define sum 0)
+
+(define (get-lines fp)
+  (let loop ((lines '()))
+    (define l (read-line fp))
+    (if (eof-object? l)
+      (reverse lines)
+      (loop (cons l lines)))))
+
+(define lines (get-lines fp))
+
+(define (extract-number line)
+  (define number-list (filter char-numeric? (string->list line)))
+  (set! number-list (map (lambda (c)
+                           (string->number (list->string (list c))))
+                         number-list))
+  (+ (last number-list) (* 10 (car number-list))))
+
+(apply + (map extract-number lines))