adventofcode-2021/day01/part2.lua

#!/usr/bin/env luajit

local count = 0
local a, b, c
for line in io.lines(arg[3]) do
	d = tonumber(line)
	if a ~= nil and a + b + c < b + c + d then
		count = count + 1
	end
	a, b, c = b, c, d
end
print(count)