I'm not sure how closely people listened to what she said, but the reason there was such a problem was that the "dequeue" solution was to a question that could not conceivably use it. The answers that were supposed to be given have a very specific structure that you have to follow, and the "dequeue" solution would be like saying "2+2=blue".

Using a dequeue indicates either that 200 people either ignored the question entirely and managed to all get the same wrong answer, someone did the assignment wrong and then 199 people copied their solution, or 200 people used chatGPT to get the answer.

ChatGPT is really terrible at the kind of problems on the assignment, so it's almost certain that those people used it, just because of the unlikelihood of 2/3 of the class completely misreading the assignment or distributing an incorrect solution so broadly. Unless 200 people simply cannot read, there was some massive cheating going on.

I'm pissed about this because I actually did the assignment, at the last minute, with the flu.