[willguest]

you forgot the logic to strip the final digit and assign it to v.

processing the whole number is absurd

[pkaeding]

I think the idea is to fill in the ellipses with even/odd numbers, up to 4B.

You know, to save the performance cost of processing the input as a string, and chomping off all but the last character.

[mgaunard]

Converting to decimal is just as absurd.

All you need is the final binary digit, which incidentally is the most optimal codegen, `v & 1`.

[71bw]

Look at Mr. Rocket Scientist over here...