View Compilation Error

0_0_37534278_12342.cpp: In member function 'bool node::operator<(const node&) const':
0_0_37534278_12342.cpp:57:81: error: expected ':' before ';' token
         return (bel[l] ^ bel[x.l]) ? bel[l] < bel[x.l] : (bel[l] & 1) ? r < x.r ;
                                                                                 ^
0_0_37534278_12342.cpp:57:81: error: expected primary-expression before ';' token