this post was submitted on 03 Dec 2024
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Advent Of Code

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I was looking through the global leader board for day 3 today and noticed that the first 100 results are all under 90 seconds, with the top 4 being under 30 seconds. How is that possible? What are people leveraging in order to accomplish this?

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[–] [email protected] 5 points 2 weeks ago (2 children)

Thinking about it a little more, the answer is a number, and the site tells you if you are too high or too low, so a modification of a binary search might be the answer? I'm not sure if there is a submission limit but if there isnt then that could result in a fast submission.

Say the answer is 400 and you guess 100, the site tells you it is too low, you guess 1000, the site tells you its too high, now you know its between 100 and 1000, so you can narrow it down with a guess in the middle until you get to the answer. With some automation this would be pretty quick but it would defeat the point of the challenge.

[–] [email protected] 11 points 2 weeks ago (1 children)

The timeouts are 1 minute for the first 5 attempts, then 5 minutes.

People are just really used to AoC's format and use languages/frameworks that are extremely concise

[–] [email protected] 5 points 2 weeks ago (1 children)

That is impressive, I think it took me more than 30 seconds to get the regex I wanted to use correct, more or less the rest of the solution. This is my first time doing AoC or anything like it so I wasn't expecting to be anywhere near the top, but the times I saw there were shocking.

[–] [email protected] 4 points 2 weeks ago

There are a lot of people participating. Some of 'em are bound to be really really good, and also get lucky!

[–] UndercoverUlrikHD 9 points 2 weeks ago (1 children)

I haven't had time for the AoC yet, but if it's like last year, there are rate limits that would make binary search ineffective.

[–] [email protected] 1 points 2 weeks ago (1 children)

Ah yeah, if you can only submit once every 30 seconds or something that would defeat the ability to binary search, at least at the speeds that people were submitting today.

[–] UndercoverUlrikHD 4 points 2 weeks ago

The timeouts become greater the more times you submit an incorrect answer