4 files changed, 647 insertions, 0 deletions

diff --git a/04/input.txt b/04/input.txt
new file mode 100644
index 0000000..bf3fffb
--- /dev/null
+++ b/04/input.txt
@@ -0,0 +1,512 @@
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diff --git a/04/lib.scm b/04/lib.scm
new file mode 100644
index 0000000..5a1fff5
--- /dev/null
+++ b/04/lib.scm
@@ -0,0 +1,74 @@
+(library (lib)
+  (export solve-part1 solve-part2)
+  (import (chezscheme))
+
+  ; Split list at first delimiter into `prefix' and `suffix'
+  ; Return value is a pair like `((p r e f i x) s u f f i x)'
+  (define (list-split-left delimiter? xs)
+    (let loop ((prefix '())
+               (suffix xs))
+      (if (null? suffix)
+        (cons prefix suffix)
+        (let ((x (car suffix)))
+          (if (delimiter? x)
+              ; Found first delimiter, so return immediately
+              (cons prefix (cdr suffix))
+              ; `x' isn't a delimiter, so append it to `prefix'
+              (loop (append prefix (list x)) (cdr suffix)))))))
+
+  ; Split list at given delimiter into list of sublists
+  (define (list-split delimiter? xs)
+    (let loop ((pieces '())
+               (rest xs))
+      (if (null? rest)
+          ; Fix order and remove all empty sublists from output
+          ; (which are caused by consecutive delimiters in `xs')
+          (reverse (remp null? pieces))
+          ; Extract next piece from `rest' and prepend it to `pieces'
+          (let ((next (list-split-left delimiter? rest)))
+            (loop (cons (car next) pieces) (cdr next))))))
+
+  ; Split string at whitespace into list of words
+  (define (string-split str)
+    (map list->string (list-split char-whitespace? (string->list str))))
+
+  ; Sort chars in string according to `proc'
+  (define (string-sort proc str)
+    (list->string (list-sort proc (string->list str))))
+
+  ; Partially applied equality check
+  (define (check-identical? word1)
+    (lambda (word2) (equal? word1 word2)))
+
+  ; Partially applied anagram check
+  (define (check-anagram? word1)
+    (lambda (word2)
+      ; Sort chars by Unicode value, then check string equality
+      (string=? (string-sort char<? word1)
+                (string-sort char<? word2))))
+
+  ; Count for how many elements of `xs' `proc' returns true
+  (define (count proc xs)
+    (length (filter proc xs)))
+
+  ; Count how many passphrases in `lines' are reported valid by `proc'
+  (define (solve-puzzle proc lines)
+    (count
+      (lambda (phrase)
+        ; For each word in `phrase', does it have any copies/anagrams?
+        (let loop ((words phrase))
+          (if (null? words)
+              #t
+              ; Count copies/anagrams, including `(car words)' itself
+              (if (> (count (proc (car words)) phrase) 1)
+                  #f
+                  (loop (cdr words))))))
+      (map string-split lines)))
+
+  (define (solve-part1 lines)
+    (solve-puzzle check-identical? lines))
+
+  (define (solve-part2 lines)
+    (solve-puzzle check-anagram? lines))
+
+)
diff --git a/04/main.scm b/04/main.scm
new file mode 100644
index 0000000..c8f57bb
--- /dev/null
+++ b/04/main.scm
@@ -0,0 +1,20 @@
+(import (chezscheme))
+
+; Where the magic happens
+(import (lib))
+
+; Read my personal puzzle input
+(define input
+  (call-with-input-file "input.txt"
+    (lambda (port)
+      (let loop ((line (get-line port))
+                 (result '()))
+        (if (eof-object? line)
+            (reverse result)
+            (loop (get-line port) (cons line result)))))))
+
+; Part 1 gives 466 for me
+(printf "Part 1 solution: ~a\n" (solve-part1 input))
+
+; Part 2 gives 251 for me
+(printf "Part 2 solution: ~a\n" (solve-part2 input))
diff --git a/04/test.scm b/04/test.scm
new file mode 100644
index 0000000..564016a
--- /dev/null
+++ b/04/test.scm
@@ -0,0 +1,41 @@
+(import (chezscheme))
+
+; Where the magic happens
+(import (lib))
+
+; My quick-and-dirty unit testing framework (copied for each day)
+(define (run-test name proc input expected)
+  (let ((result (proc input)))
+    (if (= result expected)
+      (printf "\x1b;[32;1mPASS\x1b;[0m: ~a\n"
+              name)
+      (printf "\x1b;[31;1mFAIL\x1b;[0m: ~a: got ~a, expected ~a\n"
+              name result expected))))
+
+(printf "Part 1 tests:\n")
+
+(define (test-part1 name input expected)
+  (run-test name solve-part1 input expected))
+
+(test-part1 "part 1 example 1"
+            '("aa bb cc dd ee") 1)
+(test-part1 "part 1 example 2"
+            '("aa bb cc dd aa") 0)
+(test-part1 "part 1 example 3"
+            '("aa bb cc dd aaa") 1)
+
+(printf "Part 2 tests:\n")
+
+(define (test-part2 name input expected)
+  (run-test name solve-part2 input expected))
+
+(test-part2 "part 2 example 1"
+            '("abcde fghij") 1)
+(test-part2 "part 2 example 2"
+            '("abcde xyz ecdab") 0)
+(test-part2 "part 2 example 3"
+            '("a ab abc abd abf abj") 1)
+(test-part2 "part 2 example 4"
+            '("iiii oiii ooii oooi oooo") 1)
+(test-part2 "part 2 example 5"
+            '("oiii ioii iioi iiio") 0)