View Compilation Error

0_0_23939870_18529.cpp: In member function 'bool node::operator<(const node&) const':
0_0_23939870_18529.cpp:19:29: error: expected ':' before ';' token
  return (d==b.d)?c>b.c?d>b.d;
                             ^
0_0_23939870_18529.cpp:19:29: error: expected primary-expression before ';' token
0_0_23939870_18529.cpp:19:29: error: expected ':' before ';' token
0_0_23939870_18529.cpp:19:29: error: expected primary-expression before ';' token