[Community Puzzle] Length of Syracuse Conjecture Sequence


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Created by @Silmaen,validated by @bbb000bbbyyy,@JBM and @Jamproject.
If you have any issues, feel free to ping them.

Hi @Silmaen, @JBM, @Jamproject, @bbb000bbbyyy
Would you know why I pass all test cases but not the validators? Really weird, I have nothing hard coded…
Is it a Long/Int loss of precision thing?

hard to tell without your code. But you might be on the right track because the “You can assume that no operation overflows a 32-bit integer” is misleading, it’s actually 32-bit unsigned integer. And so if you are for example coding in java, the Integer is not enough as it is a signed integer.

If I share you my code in private, would you be able to tell :stuck_out_tongue:? I’m using Scala, types are the same as in Java but I already tried moving to Long and it doesn’t work?

Actually 32-bit signed integers should be enough to prevent from overflows in all tests & validators (the maximum sequence value to compute overall is ~1.5e9).

which validator you don’t pass? the last one?
a 32bit integer is enough to pass all the tests.

it could be because of a timeout (the last validator is a ‘big’ one if you don’t use memoisation)

I already use memoisation, and I pass all test cases. However, I don’t pass validators 1, 3 and 4…

Basically what I do is either I take the first tournament and I have r-1 consecutive days left but I have the reward or I don’t and I still have r consecutive days left. If r <= 0 then I just move to the next. Hope this is not too much details.

Am I missing something?

Sure, since I am above level 20, I can retrieve the validators files and run your code to see what’s wrong.

What? Are you talking about The Grand Festival puzzle?

Thanks I sent it to you via private message. Let me know :wink: Thanks

Oooohhhh yes sorry :stuck_out_tongue:

For this one I simply did it straight forward (1 + solveProblem(n-1)) with a little bit of memoïzation. Then a loop to iterate over all n to fetch its Syracuse sequence length.

Hey @bbb000bbbyyy any news on that? Thanks :wink: !

Well damn, I replied 4 days ago but I guess there was a problem.
Anyway, yes I know where the issue is in your code. You need to make sure that it returns the “lowest integer that leads to the longest cycle-length”.

Thanks that solved my issue :wink:

Hello, my code passes all the tests in the IDE of CodinGame but not when I submit the answer. Tests 1,2 and 4 fail. Have you ever encountered this type of problem ? :thinking:

I finally found it. Pay attention to the condition in your if when searching for the maximum

My Java solution runs without any memoization at all. Shouldn’t the inputs be big enough to force you to use it? Isn’t that kind of the whole point of the puzzle?

Same for me, no memoization in java, but everything just works.