We’ve updated our Terms of Service. A new AI Addendum clarifies how Stack Overflow utilizes AI interactions.

Return to Revisions

Keg, 19 characters

?(!2/|=[|01-.(_)])1

I found no way to break a for loop, so I clear the stack to avoid getting a "-1" for each non-matching pair. This has the drawback of occasionally getting error message on STDERR, after displaying the correct result on STDOUT.

Try it online!