-- Day 6 Lua
--
require("functions")
local input_file = "Day6/full"
local input = file_characters_to_table(input_file)
local rows = tablelength(input)
local cols = tablelength(input[1])
local grandtotal = 0

local math = {}
for col = cols, 1, -1 do
	local num = ""
	local calc = ""
	for row = 1, rows do
		-- print("Checking R" .. row .. "C" .. col .. " " .. input[row][col])
		v = input[row][col]
		if tonumber(v) ~= nil then
			num = num .. input[row][col]
		elseif v == "*" or v == "+" then
			calc = v
		end
	end
	table.insert(math, tonumber(num))
	-- print("Adding " .. num)
	if calc == "*" or calc == "+" then
		local t = 0
		for k, v in ipairs(math) do
			if t == 0 then
				t = v
			else
				if calc == "+" then
					t = t + v
				end
				if calc == "*" then
					t = t * v
				end
			end
		end
		print(calc .. " " .. t)
		grandtotal = grandtotal + t
		math = {}
	end
end
print()
print("Grand total = " .. grandtotal)