The bar is so high nowadays that simply being able to talk intelligentyly about the problem, ask clarifying questions, getting an inefficient solution and coding it up well does not pass muster.

Even getting an efficient algorithm basically right, is no guarantee.

In some cases there might be alternative solutions which have some tradeoffs, and you might have to come up with those, as well

Miss a counterexample? Even if you get it after a single hint?. Fuck you, you're out. I can find someone who doesn't need the hint