want to see how I did i t?

# advent-of-code

[bjonnh]

want to see how I did i t?

[Nir]

You just take the minimum of the moduli of the bus ID's by the departure time?

[Nir]

min of departureTime % busId

[bjonnh]

no

[bjonnh]

I'm taking the solution where any bus has a time % pos == 0

[bjonnh]

incrementing time

[Nir]

ah I see my mistake, i'm referencing the bus just before instead of the one just after

[Nir]

the correct operation is (departureTime / busId).ceiling() * busId - departureTIme

[bjonnh]

if you do it that way

[bjonnh]

I'm not sure why you do it that way

[Nir]

what's wrong with that way?

[Nir]

it seems the fastest way possible

[bjonnh]

dunno it is instantaneous for me

[bjonnh]

didn't run benchs

[Nir]

I'm too tired to continue but it seems like all the bus ID's are prime

[bjonnh]

yes

[Nir]

that's almost certainly exploitable

[bjonnh]

I think I have it

[Nir]

pretty sure you can essentially do them two at a time and build it up... anyway will have ago tomorrow

[Edgars]

@Nir Instead of ceiling() I do + 1, maybe that's it. kotlin.math.ceil(5.0) == 5.0 , but maybe your ceiling() is different.

[Nir]

@Edgars it should be floor I think because you would be waiting 0 in that case

[Nir]

E.g. time 15, bus ID of 5

[Nir]

3.0.ceilong() * 5 - 15 = 0 as desired

[Edgars]

Yeah, it doesn't work for that, but it worked for the test input and my input. 😄