Exactly. At least you have to show that you know what you're doing and it's deliberate. Depending on the seniority, I expect some kind of justification in the comments, like "it's O(nˆ2), but since the input will be very small, it's ok".

In real life people do a lot of O(nˆ2) code without realizing, and usually it's just some unnecessary loop inside another loop. I want to know that you care about some things.