View Compilation Error

0_0_34719316_9789.cpp: In function 'int topology()':
0_0_34719316_9789.cpp:21:13: error: 'find_' was not declared in this scope
   if(find_(i)==i)///注意这里才能添加，因为在合并成一个点的添加的话会导致多填了 
             ^
0_0_34719316_9789.cpp:24:23: error: 'fx' was not declared in this scope
   if(in[i]==0) Q.push(fx);
                       ^
0_0_34719316_9789.cpp: In function 'int main()':
0_0_34719316_9789.cpp:72:36: error: 'finfa' was not declared in this scope
     int x=findfa(a[i]),y=finfa(b[i]);
                                    ^
0_0_34719316_9789.cpp:84:18: error: 'topoloyg' was not declared in this scope
         topoloyg();
                  ^