> it's usually the only place where you need to apply deep CS knowledge And usually, at the level you're talking about, you're probably going to be using a lib

> it's usually the only place where you need to apply deep CS knowledge And usually, at the level you're talking about, you're probably going to be using a library that's been custom built for the problem you're dealing with. Amazing how many people will yell out "don't reinvent the wheel" but would also not hire you because you'd choose to just use Apache Commons instead of writing your own sorting algorithms from scratch.