foo.cpp: In destructor 'fastCharStream::FileIOGuard::~FileIOGuard()':
foo.cpp:44:3: error: expected ';' before '}' token
   }
   ^
foo.cpp: In function 'void work()':
foo.cpp:91:17: warning: unused variable 'mk' [-Wunused-variable]
  int mn=0,ans=0,mk=0;
                 ^