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submitted 2 years ago by [email protected] to c/[email protected]
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[-] [email protected] 28 points 2 years ago

The naïve and unoptimized version ran in under 4 seconds for me, that's nowhere near "Time to knuckle down and actually optimize this" territory.

[-] [email protected] 3 points 2 years ago

I was so confused just now thinking this was about day 5. Like "What the f do you consider naïve that takes less than four seconds??"

[-] [email protected] 23 points 2 years ago
[-] [email protected] 2 points 2 years ago

this is funny

[-] [email protected] 15 points 2 years ago

Too scarred from puzzle 5 to do the naïve approach anymore.

[-] [email protected] 6 points 2 years ago

Dude, 5 was so weird, I didn't even recognize a hard or easy approach.

[-] [email protected] 11 points 2 years ago

Math is something computers know how to do. I know how to do For Each loops.

[-] [email protected] 3 points 2 years ago

There is a trap in part 2, by the way, that can trip people who try to use maths:

SpoilerThe values are so large that if one uses single precision (32 bit) floating point values, the result will not be correct. Double precision floats yield the correct result.

This means, that doing integer calculations isn't as bad as it sounds at first.

[-] [email protected] 3 points 2 years ago

Just use dictionaries in Python. Never worry about search performance any more.

[-] [email protected] 11 points 2 years ago* (last edited 2 years ago)

I mean, that literally failed just yesterday.

Also I'm not sure where in today's problem you would even use a dictionary

[-] [email protected] 1 points 2 years ago

Hey, I haven't been doing Advent this year. What was day 5's problem and why did dicts fail?

[-] [email protected] 3 points 2 years ago

There was a series of number ranges that mapped onto other ranges. The simple approach was filling dictionaries, which worked well for the example data. In the actual data, there ranges were much much larger (in the 100,000,000's), which made the dictionaries prohibitively large.

[-] [email protected] 1 points 2 years ago

If each number was 8 bytes wide, it would require, if I didn't mess up my math, 18 GB to fully represent all seeds/numbers as an array.

[-] [email protected] 3 points 2 years ago* (last edited 2 years ago)

progamming ↑↱ excel

this post was submitted on 06 Dec 2023
132 points (99.3% liked)

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