/in/foo.cc:28:34: error: stray '@' in program
   28 |  202507cj01陈梓豪 (陈梓豪1) LV 7 @ 10 个月前
      |                                  ^
/in/foo.cc:26:1: error: expected unqualified-id before '-' token
   26 | -1
      | ^
/in/foo.cc:31:5: error: redefinition of 'int main()'
   31 | int main()
      |     ^~~~
/in/foo.cc:3:5: note: 'int main()' previously defined here
    3 | int main()
      |     ^~~~