Sweeping the Floor at Tsinghua University, I Solved the World's Mathematical Problems as a Cleaner

Su Chen traveled to a parallel world. I found that I was seventeen years old again and the system was activated! On this day, her mother, a cleaner at Tsinghua University, took leave due to illness, so Su Chen cleaned the school corridors on her behalf. I just happened to come across a world-class mathematical problem that the professor of the mathematics department left in the classroom to let the students know that there is no limit to learning. Three minutes later, Su Chen wrote down the answer and turned to leave. The next day, the mathematics professor looked at the answers left on the blackboard and fell into deep thought. A week later, professors from the entire school's mathematics department finally jointly verified that Su Chen's answer was correct. But during this period of time, the whole world was in deep thought because of the genius son of a cleaner! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.