1 files changed, 11 insertions, 0 deletions
diff --git a/04/1.lua b/04/1.lua
new file mode 100644
index 0000000..100da50
--- /dev/null
+++ b/04/1.lua
@@ -0,0 +1,11 @@
+#!/usr/bin/env lua
+
+local c = 0
+for line in io.lines() do
+	local s1, e1, s2, e2 = line:match("(%d+)-(%d+),(%d+)-(%d+)")
+	s1, e1, s2, e2 = tonumber(s1), tonumber(e1), tonumber(s2), tonumber(e2)
+	if (s1 >= s2 and e1 <= e2) or (s2 >= s1 and e2 <= e1) then
+		c = c + 1
+	end
+end
+print(c)