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

Return to Revisions

Windows PowerShell, 82

filter f{!((''+($_[($_.length)..0]|%{+"$_"*($i++%2+1)})-replace'.','+$&'|iex)%10)}

History:

• 2011年02月13日 03:08 (84) First attempt.
• 2011年02月13日 12:13 (82) I don't need to join, as spaces do not hurt. +1 + +3 can still be evaluated.