-- 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)