Sadly solidity won't allow that in terms of call stack (1024) max.

Hahha I think I tried the whole big Int lib to see if it worked 🤭

Clever use of the spread and repushing into arr but very inefficient memory wise :p

Beautiful!

Very interesting use of yield*

Very pretty

This puts memo in the global scope, since it's not called with the new keyword, this refers to window.

This looks pretty to me, gj

This is very elegant sir.

Oh man I loved this one :D

Niiiiice !

-1 -2 -1 0 2 will give 3 matched by -2 -1 0. You cannot be ascending and descending in the same chain for the step to work. So no, it won't match -1 -2 -1 0 as a valid chain of 4. I understand that it's tricky to explain. But a lot solved it like this so I thought it was clear. I hope this comment will help future readers.