foo.cc: In function ‘int main()’:
foo.cc:38:85: error: unable to find numeric literal operator ‘operator""；’
   38 |                                         if(list[i].num_paper>=1){list[i].total_num+=8000；}
      |                                                                                     ^~~~~~
foo.cc:38:85: note: use ‘-fext-numeric-literals’ to enable more built-in suffixes