Initial commit

1 files changed, 36 insertions, 0 deletions

diff --git a/2020/03/puzzle-2.awk b/2020/03/puzzle-2.awk
new file mode 100755
index 0000000..88e0625
--- /dev/null
+++ b/2020/03/puzzle-2.awk
@@ -0,0 +1,36 @@
+#!/usr/bin/env -S awk -f
+
+BEGIN {
+	slope[1] = 1
+	slope[2] = 1
+	slope[3] = 1
+	slope[4] = 1
+	slope[5] = 1
+}
+
+{
+	len = split($0, obs, "")
+
+	right = 1
+	for (i = 1; i < 5; i++) {
+		if (slope[i] > len)
+			slope[i] -= len
+
+		if (obs[slope[i]] == "#")
+			count[i]++
+
+		slope[i] += right
+		right += 2
+	}
+
+	# Specific code for slope 5
+	if (NR % 2 == 1) {
+		if (slope[5] > len)
+			slope[5] -= len
+
+		if (obs[slope[5]++] == "#")
+			count[5]++
+	}
+}
+
+END { print count[1] * count[2] * count[3] * count[4] * count[5] }