Preparing for the Blue Bridge Cup Python Group B Day3: Luogu Introductory Problem Set 3 Practice Notes

1. In Python, converting between strings and integers is extremely time-consuming and can easily lead to timeouts. In the problem [NOIP 2013 Popularization Group] Counting Problem, I kept converting to strings inside nested loops, which caused a timeout.

2. Overall, nothing was too difficult, but I feel some problems have many pitfalls. I think I still lack a bit of mathematical thinking; many problems can be solved directly with brute force.