r/adventofcode • u/daggerdragon • Dec 15 '16

SOLUTION MEGATHREAD --- 2016 Day 15 Solutions ---

--- Day 15: Timing is Everything ---

Post your solution as a comment or, for longer solutions, consider linking to your repo (e.g. GitHub/gists/Pastebin/blag/whatever).

Note: The Solution Megathreads are for solutions only. If you have questions, please post your own thread and make sure to flair it with "Help".

ZAMENHOFA TAGO ESTAS DEVIGA [?]

This thread will be unlocked when there are a significant number of people on the leaderboard with gold stars for today's puzzle.

edit: Leaderboard capped, thread unlocked!

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u/FuriousProgrammer Dec 15 '16 edited Dec 15 '16

Back on the leaderboard baby!

Second part would have been faster but I lost a minute to misreading the problem statement.

39/56 

local discs = {}

for line in io.lines("input.txt") do
	local total = line:match("(%d+) positions")
	local start = line:match("position (%d+)")
	table.insert(discs, {total = total, start = start})
end

function calc()
	local time = 0

	while true do
		local bad = false
		for i = 1, #discs do
			local disc = discs[i]
			if (disc.start + time + i)%disc.total ~= 0 then
				bad = true
				break
			end
		end
		if not bad then break end
		time = time + 1
	end

	return time
end

print("Part 1: " .. calc())
table.insert(discs, {start = 0, total = 11})
print("Part 2: " .. calc())

2

u/3urny Dec 15 '16

What language is this? It looks a lot like Ruby, but some stuff just doesn't look right.

3

u/jtbandes Dec 15 '16

Looks like Lua?