/in/foo.cc: In function 'void tarjan(int, int)':
/in/foo.cc:45:4: error: 'Z' was not declared in this scope
   {Z
    ^
/in/foo.cc:51:4: error: expected '}' before 'else'
    else if(ccc.find(i))
    ^~~~
/in/foo.cc: At global scope:
/in/foo.cc:57:2: error: expected unqualified-id before 'if'
  if(dnf[s]==low[s])
  ^~
/in/foo.cc:63:1: error: expected declaration before '}' token
 } 
 ^