First, I often worry about missing key information in reading.I hope everyone can read the problem seriously.

The second point is that my own habit is to pass a sample and make several sets of test data at random. My bad habit has taught me many lessons and I hope this will be noticed. When you write the code, you must clear your mind and write it again, otherwise you may have a train of thought in the process of writing the code, and then change the code, and you may modify the error.