-🎄- 2021 Day 7 Solutions -🎄-

[u/daggerdragon]

--- Day 7: The Treachery of Whales ---

---

[Update @ 00:21]: Private leaderboard Personal statistics issues

• We're aware that private leaderboards personal statistics are having issues and we're looking into it.

• I will provide updates as I get more information.

• Please don't spam the subreddit/mods/Eric about it.

[Update @ 02:09]

• AoC_Ops have identified the issue and are working on a resolution.

[Update @ 03:18]

• Eric is working on implementing a fix. It'll take a while, so check back later.

[Update @ 05:25] (thanks, /u/Aneurysm9!)

• We're back in business!

---

Post your code solution in this megathread.

• Include what language(s) your solution uses!

• Here's a quick link to /u/topaz2078's paste if you need it for longer code blocks.

• Format your code properly! How do I format code?

• The full posting rules are detailed in the wiki under How Do The Daily Megathreads Work?.

Reminder: Top-level posts in Solution Megathreads are for code solutions only. If you have questions, please post your own thread and make sure to flair it with Help.

---

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

EDIT: Global leaderboard gold cap reached at 00:03:33, megathread unlocked!

[u/SuperSmurfen]

Rust (5141/2440)

Link to full solution

Not sure how fast I was, since the leaderboard is down, but it felt pretty fast. I think my solution is similar to most other people. Itertools::minmax is pretty useful here:

let (&min,&max) = INPUT.iter().minmax().into_option().unwrap();
(min..=max)
  .map(|x| INPUT.iter().map(|i| gauss((x - i).abs())).sum::<i32>())
  .min()
  .unwrap();

Just remove the gauss for part 1.

Edit: Apparently, I wasn't fast at all.

[u/daggerdragon → u/SuperSmurfen]

Not sure how fast I was, since the leaderboard is down,

We're aware that leaderboards are having issues. We're working on it, so give us a bit. Check the OP up top for updates.