Introduction - If you have any usage issues, please Google them yourself
Explanation: for example, there are N players competing in a tennis match. The design schedule should be able to meet the following requirements:
(1) each player must compete with the other N-1 players once;
(2) each player can only participate once a day;
(3) the round robin ends in N-1 days.
Enter the athlete's name, and the program outputs the race schedule.