I found a time machine under my sofa and apparently it took me back to the first of December 2020. :...

# advent-of-code

[Paul Woitaschek]

I found a time machine under my sofa and apparently it took me back to the first of December 2020. 🕛 K
Has someone an idea how to deduplicate the permutation logic of the functions permutations2 and permutations3?
https://github.com/PaulWoitaschek/AdventOfCode/blob/main/src/main/kotlin/de/woitaschek/aoc/year2020/Day1.kt

[ephemient]

one big hint is that you don't actually need `permutations3`…

[Paul Woitaschek]

What's wrong with it? You mean I could first sum one permutation and then do it again with the original input?

[ephemient]

if you're ok with spoilers,

[Paul Woitaschek]

Yeah it's fine I already solved it and it runs within a few ms

[ephemient]

given x+y+z=2020, after choosing x and y, you don't need to iterate over anything to find z

[Alex LO]

@ephemient has to be an AI, he see to quickly optimisation 😂