Sometimes, I encounter genuinely interesting questions that get deleted, either because the OP figured it out right after posting, or because it was receiving downvotes and close votes for any number of (valid) reasons, and answers that get deleted out of doubt or to be reposted as comments but turn out to be the correct answers.
In the case of questions, while they may have been downvoted and closed for perfectly valid reasons, I believe I can improve them to be on-topic or otherwise acceptable. Except in this case, the questions were deleted by the owner by choice.
Since it takes more than one community vote to undelete posts anyway, can a user with the right privileges cast undelete votes for those reasons? Specifically for deleted answers, is there anything else one can do like somehow asking the author to undelete their answer because it turns out to be correct? (I did it once for this answer by posting a comment under my question, but only because there was a good chance this particular author would be refreshing it anyway.)