In the online judge, when a candidate enters a certain exam, the test questions and answers will be displayed.
There are two options I can think of.
1. Login is all distribution method
After entering for the first time, judge whether the student has generated test questions, if not, generate a set of test questions for him and put it in the solution table.
After each entry, the test questions of the relevant examination room will be read from the solution table, displayed, and counted.
2. Take test questions from the test paper library and display them
The volume plan is stored in a certain table. Each time you log in, the data is read from the volume plan and displayed. Only when a question is submitted, it is placed in the solution table.
I feel that the logic of the first scheme is clearer.