> "Their ability to filter out 'those who can't code' in an efficient manor while sacrificing a small amount" This is the assumption I was referring to, that t

> "Their ability to filter out 'those who can't code' in an efficient manor while sacrificing a small amount" This is the assumption I was referring to, that the "sacrifice" is small. It's suggesting that the false-negative rate for LeetCode challenges is small, and I'd argue it's actually quite high -- as you also suggest (your rate is 90%).