2024-02 in factor

2 files changed, 52 insertions, 0 deletions

diff --git a/2024/02-Red-Nosed_Reports/02-tests.factor b/2024/02-Red-Nosed_Reports/02-tests.factor
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index 0000000..64d34bd
--- /dev/null
+++ b/2024/02-Red-Nosed_Reports/02-tests.factor
@@ -0,0 +1,7 @@
+! Copyright (C) 2024 Julien (adyxax) Dessaux.
+! See https://factorcode.org/license.txt for BSD license.
+USING: tools.test aoc.2024.02.private ;
+IN: aoc.2024.02.tests
+
+{ 2 } [ "example" part1 ] unit-test
+{ 4 } [ "example" part2 ] unit-test
diff --git a/2024/02-Red-Nosed_Reports/02.factor b/2024/02-Red-Nosed_Reports/02.factor
new file mode 100644
index 0000000..455b723
--- /dev/null
+++ b/2024/02-Red-Nosed_Reports/02.factor
@@ -0,0 +1,45 @@
+! Copyright (C) 2024 Julien (adyxax) Dessaux.
+! See https://factorcode.org/license.txt for BSD license.
+USING: combinators.short-circuit.smart grouping io io.encodings.utf8 io.files
+kernel math math.order math.parser prettyprint sequences splitting ;
+IN: aoc.2024.02
+
+<PRIVATE
+
+: load_input ( filename -- reports ) ! reports are a sequence of levels
+    "~/git/adyxax/aoc/2024/02-Red-Nosed_Reports/"
+    swap append utf8 file-lines
+    [ split-words [ string>number ] map ] map ;
+
+: bounded? ( levels -- ? )
+    [ - abs 1 3 between? ] monotonic? ;
+
+: any_monotonic? ( levels -- ? )
+    { [ [ > ] monotonic? ]
+      [ [ < ] monotonic? ]
+    } || ;
+
+: safe? ( levels -- ? )
+    { [ any_monotonic? ] [ bounded? ] } && ;
+
+: part1 ( filename -- n )
+    load_input
+    [ safe? ] count ;
+
+: candidates ( report -- reports )
+    dup length <iota> [ over remove-nth ] map nip ;
+
+: safish? ( report -- ? )
+    candidates [ safe? ] any? ;
+
+: part2 ( filename -- n )
+    load_input
+    [ safish? ] count ;
+
+PRIVATE>
+
+: aoc202402 ( -- )
+    "input" part1 .
+    "input" part2 . ;
+
+MAIN: aoc202402