From 9c96d30ea65ce132a7cba28e2460683041c4c0a3 Mon Sep 17 00:00:00 2001
From: Felix Van der Jeugt <felix.vanderjeugt@posteo.net>
Date: Wed, 22 Dec 2021 17:44:52 +0100
Subject: [PATCH] day 22 part 2

---
 day22/part2.lua | 48 +++++++++++++++++++++++-------------------------
 1 file changed, 23 insertions(+), 25 deletions(-)

diff --git a/day22/part2.lua b/day22/part2.lua
index 62cd4ce..f59eca9 100755
--- a/day22/part2.lua
+++ b/day22/part2.lua
@@ -57,39 +57,37 @@ local function cut3d(a, b)
 	                   }
 	for _, combo in pairs(nobscombos) do
 		local xs, ys, zs = unpack(combo)
-		for _, x in pairs(xs) do
-		for _, y in pairs(ys) do
-		for _, z in pairs(zs) do
+		for _, x in pairs(xs) do if x.s < x.e then
+		for _, y in pairs(ys) do if y.s < y.e then
+		for _, z in pairs(zs) do if z.s < z.e then
 			table.insert(aparts, { b = a.b, x=x, y=y, z=z })
-		end
-		end
-		end
+		end end
+		end end
+		end end
 	end
 
 	return aparts
 end
 
-local fixed = { ranges[1] }
-table.remove(ranges, 1)
-for _, range in pairs(ranges) do
-	local newfixed = {}
-	--printtable(range)
-	if range.b then
-		table.insert(newfixed, range)
-	end
-	for _, f in pairs(fixed) do
-		for _, fpart in pairs(cut3d(f, range)) do
-			--io.write(" ")
-			--printtable(fpart)
-			table.insert(newfixed, fpart)
+local count = 0
+for i = 1, #ranges do
+	if ranges[i].b then
+		print(i, os.clock())
+		local fixed = { ranges[i] }
+		for j = i + 1, #ranges do
+			local newfixed = {}
+			for _, f in pairs(fixed) do
+				for _, fpart in pairs(cut3d(f, ranges[j])) do
+					table.insert(newfixed, fpart)
+				end
+			end
+			fixed = newfixed
+		end
+		for _, r in pairs(fixed) do
+			-- printtable(r)
+			count = count + (r.x.e - r.x.s)*(r.y.e - r.y.s)*(r.z.e - r.z.s)
 		end
 	end
-	fixed = newfixed
 end
 
-local count = 0
-for _, r in pairs(fixed) do
-	-- printtable(r)
-	count = count + (r.x.e - r.x.s)*(r.y.e - r.y.s)*(r.z.e - r.z.s)
-end
 io.write(string.format("%d\n", count))