How to deal with unanswerable questions being logical traps? Every answer on such questions could be downvoted as not an answer and no matter what you write, the OP can be unsatisfied.
Take that question for example: Update all values at a time in HashMap
Here is asked how to update multiple values in java's HashTable without using loop. It is impossible, because in HashTable, the values aren't stored in single memory block (there are blocks of key-value). There elementary instructions modifying continuous block of memory in some languages, but here we have an array of pointers pointing to key-value objects.
However, the question raised quite large activity from reputation hunters trying to sweep the loop under the carpet by calling some libraries which call the loop internally. Then they were disappointed with someone downvoting their answers (it could be OP himself).
My question is, how should we act with such questions? Ignoring them won't help, because there's no 'ignore' flag and they will gain activity anyway. Close attempt didn't succeed - you don't see what's wrong with this question at first moment. Flagging it as not welcomed in our community also didn't help - flag was refused.
Why I think there need to be done something with such questions? Because they gain attention they not deserve, a lot of people are trying to trick the OP, but no matter how much they try, any answer can be downvoted and commented as not related to the question (haven't I say, no loop?).