Forgot to commit the last few days

2025/Day9/Day9.lua

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+-- Advent of Code 2025 - Day 9 - Bas Grolleman
+require("functions")
+local filename = "Day9/full"
+local grid = {}
+for line in io.lines(filename) do
+	local y, x = line:match("(%d+),(%d+)")
+	table.insert(grid, {
+		x = x,
+		y = y,
+	})
+end
+
+function size(p1, p2)
+	width = math.abs(p1.x - p2.x) + 1
+	height = math.abs(p1.y - p2.y) + 1
+	-- print(p1.x .. "," .. p1.y)
+	-- print(p2.x .. "," .. p2.y)
+	-- print(width .. " " .. height .. " " .. (width * height))
+	return width * height
+end
+
+testsize = size({ y = 2, x = 5 }, { y = 9, x = 7 })
+print("Testing size function 24=" .. testsize)
+
+local distance = {}
+local biggest = 0
+for k1, p1 in ipairs(grid) do
+	for k2, p2 in ipairs(grid) do
+		if k1 ~= k2 then
+			local cs = size(p1, p2)
+			if biggest < cs then
+				biggest = cs
+			end
+		end
+	end
+end
+
+print(biggest)