When you see a problem, it is a new one. You always start with the most basic principles and think about solutions. There is no such thing as a solution to a problem or a process to solve it. This is the logical thinking ability that a person should have, instead of inputting a problem like a fixed program, judging and choosing a solution method according to the known conditions of the problem, then choosing a solution method according to the known cycle judgment, and finally substituting data into the solution method to get the result.