add day 1 solutions

1 files changed, 22 insertions, 0 deletions

diff --git a/1.scm b/1.scm
new file mode 100755
index 0000000..7a6e953
--- /dev/null
+++ b/1.scm
@@ -0,0 +1,22 @@
+#!/usr/bin/guile -s
+!#
+(use-modules (ice-9 regex)
+             (ice-9 textual-ports)
+             (srfi srfi-1))
+
+(define (read-lines port)
+  (letrec ((loop (lambda (l ls)
+                   (if (eof-object? l)
+                       ls
+                       (loop (get-line port) (cons l ls))))))
+    (reverse (loop (get-line port) '()))))
+
+(define (fix-line line)
+  (let ((matches (string-match "[a-z]*([0-9])(.*([0-9]))?" line)))
+    (string->number (string-append (match:substring matches 1)
+                                   (or (match:substring matches 3) (match:substring matches 1))))))
+
+(let* ((port (open-input-file "1.txt"))
+       (lines (read-lines port)))
+  (close-port port)
+  (display (fold + 0 (map fix-line lines))))