1 files changed, 16 insertions, 0 deletions
diff --git a/2023/04/puzzle-2.py b/2023/04/puzzle-2.py
new file mode 100644
index 0000000..8fdf4fd
--- /dev/null
+++ b/2023/04/puzzle-2.py
@@ -0,0 +1,16 @@
+def main() -> None:
+	with open("input", "r") as f:
+		lines = f.readlines()
+	xs = [1] * len(lines)
+	for i, line in enumerate(lines):
+		l, r = map(str.split, line.split('|'))
+		l = set(filter(str.isdigit, l))
+		r = set(filter(str.isdigit, r))
+		n = len(l & r)
+		for j in range(n):
+			xs[i + j + 1] += xs[i]
+	print(sum(xs))
+
+
+if __name__ == "__main__":
+	main()
+\ No newline at end of file