4 files changed, 1060 insertions, 0 deletions

diff --git a/day04 b/day04
new file mode 100644
index 0000000..8719d89
--- /dev/null
+++ b/day04
@@ -0,0 +1,1000 @@
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diff --git a/day04.k b/day04.k
new file mode 100644
index 0000000..0fd8d7a
--- /dev/null
+++ b/day04.k
@@ -0,0 +1,3 @@
+(a;b;c;d):+(.',/"-"\'","\)'0:"day04"
++/1>(c-a)*d-b
++/1>(d-a)*c-b
diff --git a/day04.rkt b/day04.rkt
new file mode 100644
index 0000000..4f9ba21
--- /dev/null
+++ b/day04.rkt
@@ -0,0 +1,31 @@
+#lang racket
+(require (for-syntax syntax/for-body)
+         syntax/parse/define)
+
+(define-syntax-parse-rule (for/count clauses body ... tail-expr)
+  #:with original this-syntax
+  #:with ((pre-body ...) (post-body ...))
+         (split-for-body this-syntax #'(body ... tail-expr))
+  (for/fold/derived original
+    ([count 0])
+    clauses
+    pre-body ...
+    (define maybe-count (let () post-body ...))
+    (if maybe-count
+      (+ count 1)
+      count)))
+
+
+(for/count ([line (file->lines "day04")])
+  (match-let ([(list a b c d) (map string->number
+                                   (string-split line #px"[^0-9]"))])
+    (or (<= a c d b)
+        (<= c a b d))))
+; 651
+
+(for/count ([line (file->lines "day04")])
+  (match-let ([(list a b c d) (map string->number
+                                   (string-split line #px"[^0-9]"))])
+    (and (<= c b)
+         (<= a d))))
+; 956                       
diff --git a/day04.zig b/day04.zig
new file mode 100644
index 0000000..3c621b8
--- /dev/null
+++ b/day04.zig
@@ -0,0 +1,26 @@
+const std = @import("std");
+const data = @embedFile("day04");
+
+pub fn main() !void {
+    var part1: i32 = 0;
+    var part2: i32 = 0;
+
+    var lines = std.mem.split(u8, data, "\n");
+
+    while (lines.next()) |line| {
+        if (line.len == 0)
+            break;
+
+        var parts = std.mem.tokenize(u8, line, ",-");
+
+        var a = try std.fmt.parseInt(i32, parts.next().?, 10);
+        var b = try std.fmt.parseInt(i32, parts.next().?, 10);
+        var c = try std.fmt.parseInt(i32, parts.next().?, 10);
+        var d = try std.fmt.parseInt(i32, parts.next().?, 10);
+
+        if ((c - a) * (d - b) <= 0) part1 += 1;
+        if ((d - a) * (c - b) <= 0) part2 += 1;
+    }
+
+    std.debug.print("{} {}\n", .{ part1, part2 });
+}