/in/foo.cc: In function 'void DFS()':
/in/foo.cc:4:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define rep(i,n) for(int i=0;i<n;i++)
                                
/in/foo.cc:57:7:
   rep(i,lk[x].size())
       ~~~~~~~~~~~~~~           
/in/foo.cc:57:3: note: in expansion of macro 'rep'
   rep(i,lk[x].size())
   ^~~

KeyError('config.ini',)