day 5

05/1.scm

@@ -0,0 +1,52 @@
+(import (chicken io))
+(import (chicken string))
+(import srfi-69)
+(import srfi-1)
+
+(define (read-input)
+  (with-input-from-file "input"
+    (lambda ()
+      (define part1
+        (let loop ((ret '()))
+          (let ((line (read-line)))
+            (if (= 0 (string-length line))
+                (reverse ret)
+                (loop (cons line ret))))))
+      (define part2
+        (let loop ((ret '()))
+          (let ((line (read-line)))
+            (if (eof-object? line)
+                (reverse ret)
+                (loop (cons line ret))))))
+      (values part1 part2))))
+
+(define-values (part1 part2) (read-input))
+
+(set! part1 (map (lambda (x) (string-split x "|")) part1))
+(set! part1 (map (lambda (x) (map string->number x)) part1))
+
+(define rules (make-hash-table))
+
+(map (lambda (x)
+       (hash-table-set! rules x #t) '())
+     part1)
+
+(define updates (map (lambda (x) (string-split x ",")) part2))
+(set! updates (map (lambda (x) (map string->number x)) updates))
+
+(define (check-rules x lst)
+  (if (null? lst)
+      #t
+      (and (not (hash-table-ref/default rules (list (car lst) x) #f))
+           (check-rules x (cdr lst)))))
+
+(define (check-update update)
+  (if (null? update)
+      #t
+      (and (check-rules (car update) (cdr update))
+           (check-update (cdr update)))))
+
+(define (median lst)
+  (list-ref lst (quotient (length lst) 2)))
+
+(display (apply + (map median (filter check-update updates))))

05/2.scm

@@ -0,0 +1,82 @@
+(import (chicken io))
+(import (chicken string))
+(import srfi-69)
+(import srfi-1)
+
+(define (read-input)
+  (with-input-from-file "input"
+    (lambda ()
+      (define part1
+        (let loop ((ret '()))
+          (let ((line (read-line)))
+            (if (= 0 (string-length line))
+                (reverse ret)
+                (loop (cons line ret))))))
+      (define part2
+        (let loop ((ret '()))
+          (let ((line (read-line)))
+            (if (eof-object? line)
+                (reverse ret)
+                (loop (cons line ret))))))
+      (values part1 part2))))
+
+(define-values (part1 part2) (read-input))
+
+(set! part1 (map (lambda (x) (string-split x "|")) part1))
+(set! part1 (map (lambda (x) (map string->number x)) part1))
+
+(define rules (make-hash-table))
+
+(map (lambda (x)
+       (hash-table-set! rules x #t) '())
+     part1)
+
+(define updates (map (lambda (x) (string-split x ",")) part2))
+(set! updates (map (lambda (x) (map string->number x)) updates))
+
+(define (check-rules x lst)
+  (if (null? lst)
+      #t
+      (and (not (hash-table-ref/default rules (list (car lst) x) #f))
+           (check-rules x (cdr lst)))))
+
+(define (find-failed x lst)
+  (if (null? lst)
+      #f
+      (if (hash-table-ref/default rules (list (car lst) x) #f)
+          lst
+          (find-failed x (cdr lst)))))
+
+(define (check-update update)
+  (if (null? update)
+      #t
+      (and (check-rules (car update) (cdr update))
+           (check-update (cdr update)))))
+
+(define (correct-update! update)
+  (if (null? update)
+      '()
+      (let ()
+        (define failed (find-failed (car update) (cdr update)))
+        (if failed
+            (let ()
+              (define tmp (car failed))
+              (set-car! failed (car update))
+              (set-car! update tmp))
+            (correct-update! (cdr update))))))
+
+(define (median lst)
+  (list-ref lst (quotient (length lst) 2)))
+
+(define incorrect (filter (lambda (x) (not (check-update x))) updates))
+
+(define (do-correction! lst)
+  (if (check-update lst)
+      '()
+      (let ()
+        (correct-update! lst)
+        (do-correction! lst))))
+
+(map do-correction! incorrect)
+
+(display (apply + (map median incorrect)))

05/input

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README.md

@@ -1,3 +1 @@
 My solutions for Advent of Code 2024
-
-This year I will try to solve problems in CHICKEN Scheme.