foo.c:1:1: warning: data definition has no type or storage class
    1 | CS=int(input("请输入参赛人数（大于100的整数）"))
      | ^~
foo.c:1:1: warning: type defaults to 'int' in declaration of 'CS' [-Wimplicit-int]
foo.c:1:4: error: expected expression before 'int'
    1 | CS=int(input("请输入参赛人数（大于100的整数）"))
      |    ^~~

[Hydro](https://hydro.ac)提供评测服务