foo.c:1:3: error: invalid preprocessing directive #-
 # -*- coding: utf-8 -*-
   ^
foo.c:2:3: warning: missing terminating " character
 """
   ^
foo.c:2:1: error: expected identifier or '(' before string constant
 """
 ^~
foo.c:2:3: error: missing terminating " character
 """
   ^
foo.c:5:1: error: stray '@' in program
 @author: g2236118
 ^
foo.c:6:3: warning: missing terminating " character
 """
   ^
foo.c:6:3: error: missing terminating " character
foo.c:13:7: warning: multi-character character constant [-Wmultichar]
 print('%.2f'%S)
       ^~~~~~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。