Add day trois

1/main.scm

@@ -3,8 +3,6 @@
         (scheme process-context)
         (scheme write))
 
-(include "../common.scm")
-
 (define (direction->arithmetic direction)
   (cond
    ((char=? direction #\L) -)
@@ -55,6 +53,6 @@
                       (+ zeros add-zeros (if (and (zero? dial) (negative? dial+-distance)) -1 0))
                       (read-line)))))))))
 
-(for-each print (map part1 (command-line-arguments)))
+(for-each (lambda (s) (display s) (newline)) (map part1 (cdr (command-line))))
-(for-each print (map part2 (command-line-arguments)))
+(for-each (lambda (s) (display s) (newline)) (map part2 (cdr (command-line))))
 

2/main.scm

@@ -5,7 +5,20 @@
         (scheme process-context)
         (scheme write))
 
-(include "../common.scm")
+(define (string-split str delim?)
+  (let ((in (open-input-string str)))
+    (let loop ((acc '())
+               (out (open-output-string)))
+      (let ((c (read-char in)))
+        (cond
+         ((eof-object? c)
+          (reverse (cons (get-output-string out) acc)))
+         ((delim? c)
+          (loop (cons (get-output-string out) acc)
+                (open-output-string)))
+         (else
+          (write-char c out)
+          (loop acc out)))))))
 
 (define powers-of-ten
   #(1 10 100 1000 10000 100000 1000000 10000000 100000000 1000000000 10000000000))
@@ -71,10 +84,5 @@
             (newline))
           (loop (cdr ranges) (+ sum (sumfn (string->number (caar ranges)) (string->number (cadar ranges)))))))))
 
-(for-each (lambda (file) (part file sum-invalid-in-range-part1)) (command-line-arguments))
+(for-each (lambda (file) (part file sum-invalid-in-range-part1)) (cdr (command-line)))
-(for-each (lambda (file) (part file sum-invalid-in-range-part2)) (command-line-arguments))
+(for-each (lambda (file) (part file sum-invalid-in-range-part2)) (cdr (command-line)))
-
-
-;; (print (number->string (sum-invalid-in-range 11 22)))
-
-#;(for-each print (map part2 (command-line-arguments)))

3/GNUmakefile

@@ -0,0 +1,2 @@
+# -*- makefile-gmake -*-
+include ../gnu.mk

3/main.scm

@@ -0,0 +1,31 @@
+(import (scheme base)
+        (scheme char)
+        (scheme cxr)
+        (scheme file)
+        (scheme process-context)
+        (scheme write))
+
+(define (max-joltage line batteries)
+  (let ((lst (map digit-value (string->list line))))
+    (let loop ((req-tail-length (- batteries 1))
+               (lst lst)
+               (sum 0))
+      (if (negative? req-tail-length)
+          sum
+          ;; this is O^one million at least
+          (let ((m (memq (apply max (reverse (list-tail (reverse lst) req-tail-length))) lst)))
+            (loop (- req-tail-length 1) (cdr m) (+ (* sum 10) (car m))))))))
+
+(define (part file batteries)
+  (with-input-from-file file
+    (lambda ()
+      (let loop ((line (read-line))
+                 (sum 0))
+        (if (eof-object? line)
+            (begin
+              (display (number->string sum))
+              (newline))
+            (loop (read-line) (+ sum (max-joltage line batteries))))))))
+
+(for-each (lambda (file) (part file 2)) (cdr (command-line)))
+(for-each (lambda (file) (part file 12)) (cdr (command-line)))

3/makefile

@@ -0,0 +1,4 @@
+# -*- makefile-bsdmake -*-
+# Disable Skint because no numerical tower
+SCHEMES=chibi chicken gauche guile racket sagittarius
+.include "../common.mk"

common.scm

@@ -1,28 +0,0 @@
-;; Shitty print for convenience
-(define (print . args)
-  (display (apply string-append args))
-  (newline))
-
-;; Chicken command-line-arguments for no reason at all
-(define (command-line-arguments)
-  (cdr (command-line)))
-
-;; Guile string-split
-(define (string-split str delim?)
-  (let ((in (open-input-string str)))
-    (let loop ((acc '())
-               (out (open-output-string)))
-      (let ((c (read-char in)))
-        (cond
-         ((eof-object? c)
-          (reverse (cons (get-output-string out) acc)))
-         ((delim? c)
-          (loop (cons (get-output-string out) acc)
-                (open-output-string)))
-         (else
-          (write-char c out)
-          (loop acc out)))))))
-
-;; Reverse for-each, for convenience
-(define (xfor-each1 lst fn)
-  (for-each fn lst))