1 files changed, 39 insertions, 43 deletions

diff --git a/advent-of-code/2023/03/2.rkt b/advent-of-code/2023/03/2.rkt
index 2bc8c6b..71c3221 100644
--- a/advent-of-code/2023/03/2.rkt
+++ b/advent-of-code/2023/03/2.rkt
@@ -5,7 +5,7 @@
 
 (define (read-input)
   (call-with-input-file "input"
-    (lambda (fp) 
+    (λ (fp)
       (list->vector (get-lines fp)))))
 
 (define schema (read-input))
@@ -22,60 +22,56 @@
   (define nums '())
   (let loop ((i 0))
     (if (>= i height)
-      (void)
-      (let ()
-        (let loop ((j 0))
+        (void)
+        (let ()
+          (let loop ((j 0))
             (define curline (vector-ref schema i))
             (if (>= j width)
-            (void)
-            (let ()
-                (define next 1)
-                (define (find-next)
-                  (if (or (>= (+ j next) 140)
-                          (not (char-numeric? (char-at i (+ j next)))))
-                    (void)
-                    (let ()
-                      (set! next (+ 1 next))
-                      (find-next))))
-                (if (char-numeric? (char-at i j))
-                  (let ()
-                    (find-next)
-                    (define value (string->number (substring curline j (+ j next))))
-                    (set! nums (cons (make-num i j value next) nums)))
-                  (void))
-                (loop (+ j next)))))
-        (loop (+ 1 i)))))
+                (void)
+                (let ()
+                  (define next 1)
+                  (define (find-next)
+                    (if (or (>= (+ j next) 140)
+                            (not (char-numeric? (char-at i (+ j next)))))
+                        (void)
+                        (let ()
+                          (set! next (+ 1 next))
+                          (find-next))))
+                  (if (char-numeric? (char-at i j))
+                      (let ()
+                        (find-next)
+                        (define value (string->number (substring curline j (+ j next))))
+                        (set! nums (cons (make-num i j value next) nums)))
+                      (void))
+                  (loop (+ j next)))))
+          (loop (+ 1 i)))))
   (reverse nums))
 (define nums (scan-nums))
 
-(define (is-symbol? c)
-  (and (not (char-numeric? c))
-       (not (char=? #\. c))))
-
 (define (collect-adjacent-positions num)
   (define (position-range line start end)
     (define delta (- end start))
     (map list (repeat delta line) (range start end)))
   (define left
     (if (= 0 (num 'col))
-      '()
-      (list (list (num 'line) (- (num 'col) 1)))))
+        '()
+        (list (list (num 'line) (- (num 'col) 1)))))
   (define right
     (if (= width (+ (num 'col) (num 'length)))
-      '()
-      (list (list (num 'line) (+ (num 'col) (num 'length))))))
+        '()
+        (list (list (num 'line) (+ (num 'col) (num 'length))))))
   (define up
     (if (= 0 (num 'line))
-      '()
-      (position-range (- (num 'line) 1)
-                      (max 0 (- (num 'col) 1))
-                      (min width (+ (num 'col) (num 'length) 1)))))
+        '()
+        (position-range (- (num 'line) 1)
+                        (max 0 (- (num 'col) 1))
+                        (min width (+ (num 'col) (num 'length) 1)))))
   (define down
     (if (= (- height 1) (num 'line))
-      '()
-      (position-range (+ (num 'line) 1)
-                      (max 0 (- (num 'col) 1))
-                      (min width (+ (num 'col) (num 'length) 1)))))
+        '()
+        (position-range (+ (num 'line) 1)
+                        (max 0 (- (num 'col) 1))
+                        (min width (+ (num 'col) (num 'length) 1)))))
   (append left right up down))
 
 (define asterisks (make-hash))
@@ -84,11 +80,11 @@
   (define adjs (collect-adjacent-positions num))
   (define (mark coord)
     (if (not (char=? #\* (char-at (car coord) (cadr coord))))
-      (void)
-      (let ()
-        (when (not (hash-has-key? asterisks coord))
-          (hash-set! asterisks coord '()))
-        (hash-set! asterisks coord (cons (num 'value) (hash-ref asterisks coord))))))
+        (void)
+        (let ()
+          (when (not (hash-has-key? asterisks coord))
+            (hash-set! asterisks coord '()))
+          (hash-set! asterisks coord (cons (num 'value) (hash-ref asterisks coord))))))
   (for-each mark adjs))
 
 (for-each mark-adj-asterisk nums)