View Compilation Error

0_0_17953284_2517.cpp: In function 'bool cmp_mdt(Tq, Tq)':
0_0_17953284_2517.cpp:45:59: error: expected ')' before ';' token
     return a.t<b.t || (a.t==b.t && ((dfn[a.v]<dfn[b.v]))  ;
                                                           ^