1 files changed, 43 insertions, 0 deletions
diff --git a/13/1.lua b/13/1.lua
new file mode 100644
index 0000000..94d8bd9
--- /dev/null
+++ b/13/1.lua
@@ -0,0 +1,43 @@
+
+local lines = {}
+for line in io.lines() do table.insert(lines,line) end
+
+local sum = 0
+for i = 1,#lines,3 do
+	local l1,l2 = lines[i], lines[i+1]
+	l1 = l1:gsub("%[","{"):gsub("]","}")
+	l2 = l2:gsub("%[","{"):gsub("]","}")
+	l1 = load("return "..l1)()
+	l2 = load("return "..l2)()
+	local function compare(a,b) -- return true if a comes before b
+		assert(a ~= nil)
+		assert(b ~= nil)
+		if type(a) == "number" and type(b) == "number" then
+			if a < b then return true
+			elseif a > b then return false 
+			else return nil end
+		elseif type(a) == "table" and type(b) == "table" then
+			for i = 1,math.min(#a,#b) do
+				local result = compare(a[i],b[i]) 
+				if result ~= nil then
+					return result
+				end
+			end
+			if #a < #b then
+				return true
+			elseif #a > #b then
+				return false
+			else 
+				return nil
+			end
+		elseif type(a) == "number" and type(b) == "table" then
+			return compare({a},b)
+		elseif type(a) == "table" and type(b) == "number" then
+			return compare(a,{b})
+		end
+	end
+	if compare(l1,l2) then
+		sum = sum + ((i+2)/3)
+	end
+end
+print(sum)