The paper read: This is your fourth test. You once demonstrated your excellent reasoning ability in this lecture building. Unfortunately, I wasn’t present at the time. Now, I’d like to make up for this regret. As you can see, the student in the classroom died from multiple stab wounds. Without entering the classroom or sending anything in, you must deduce how many stab wounds he received behind these doors and windows. When you’re done, break the glass with the right answer. You have five minutes!"

I stared at the piece of paper, eyes narrowing with outrage. What he was asking for was almost impossible!

With little time on the clock, I couldn't help but take a picture of the paper and send it to Xiaotao.

I cudgeled...