foo.c:1:1: error: expected identifier or '(' before '?' token
 ?? 
 ^
foo.c:14:25: warning: character constant too long for its type
 /in/foo.cc: In function 'void abc()':
                         ^~~~~~~~~~~~
foo.c:15:65: warning: multi-character character constant [-Wmultichar]
 /in/foo.cc:23:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
                                                                 ^~~~
foo.c:17:8: error: expected identifier or '(' before '~' token
        ~^~
        ^
foo.c:2:1: error: invalid suffix "ms" on integer constant
 ?? 
 ^~~
foo.c:3:1: error: invalid suffix "ms" on integer constant
 ?? 
 ^~~
foo.c:4:1: error: invalid suffix "ms" on integer constant
 ?? 
 ^~~
foo.c:5:1: error: invalid suffix "ms" on integer constant
 ?? 
 ^~~
foo.c:6:1: error: invalid suffix "ms" on integer constant
 xieyongdian 
 ^~~
foo.c:7:1: error: invalid suffix "ms" on integer constant
 
 ^  
foo.c:8:1: error: invalid suffix "ms" on integer constant
 ???????
 ^~~
foo.c:11:9: fatal error: bits/stdc++.h: No such file or directory
 ????
         ^              
compilation terminated.

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