Add day 3 solutions

1 files changed, 22 insertions, 0 deletions

diff --git a/2021/03/puzzle-1.awk b/2021/03/puzzle-1.awk
new file mode 100755
index 0000000..4f02561
--- /dev/null
+++ b/2021/03/puzzle-1.awk
@@ -0,0 +1,22 @@
+#!/usr/bin/env -S awk -f
+
+BEGIN { FS = "" }
+
+{
+	for (i = 1; i <= NF; i++) {
+		if ($i == "0")
+			z[i]++
+		else
+			o[i]++
+	}
+}
+
+END {
+	for (i = 1; i <= NF; i++) {
+		g = g (z[i] > o[i] ? "0" : "1")
+		e = e (z[i] < o[i] ? "0" : "1")
+	}
+	(cmd = "echo 'ibase = 2;" g "*" e "' | bc") | getline out
+	close(cmd)
+	print out
+}