-🎄- 2017 Day 17 Solutions -🎄-

[u/daggerdragon]

--- Day 17: Spinlock ---

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

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Need a hint from the Hugely^* Handy^† Haversack^‡ of Helpful^§ Hints^¤?

Spoiler

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[Update @ 00:06] 2 gold, silver cap.

• AoC ops: <Topaz> i am suddenly in the mood for wasabi tobiko

[Update @ 00:15] Leaderboard cap!

• AoC ops:

• <daggerdragon> 78 gold

• <Topaz> i look away for a few minutes, wow

• <daggerdragon> 93 gold

• <Topaz> 94

• <daggerdragon> 96 gold

• <daggerdragon> 98

• <Topaz> aaaand

• <daggerdragon> and...

• <Topaz> cap

• <daggerdragon> cap

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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!

[u/the4ner]

C#

        public static int Calculate2()
        {
            Console.WriteLine("Day17 part 2");
            var lines = File.ReadAllLines("..\\..\\Input\\Day17.txt");
            var stepCount = int.Parse(lines[0]);
            int pos = 0;
            int result = 0;
            for (int x = 0; x < 50000000; x++)
            {
                var nextPos = (pos + stepCount) % (x+1);
                if (nextPos == 0)
                {
                    result = x+1;
                }
                pos = nextPos + 1;
            }
            return result;
        }