View Compilation Error

0_0_25787851_29229.cpp: In function 'int main()':
0_0_25787851_29229.cpp:9:33: error: 'link_edge' was not declared in this scope
 #define link1(a,b) link_edge(a,b),link_edge(b,a)
                                 ^
0_0_25787851_29229.cpp:79:64: note: in expansion of macro 'link1'
    rep(e,0,scc[w].size()-1)travel(scc[w][e])if(!bi[num[to[q]]])link1(w,num[to[q]]+scc_cnt),bi[num[to[q]]]=1;
                                                                ^