/in/foo.cc: In function 'std::pair<long long int, long long int> lca(int, int)':
/in/foo.cc:85:9: warning: unused variable 'max1' [-Wunused-variable]
     int max1=-41534,max2=-41534,mix1=-41534,mix2=-41534;
         ^~~~
/in/foo.cc:85:21: warning: unused variable 'max2' [-Wunused-variable]
     int max1=-41534,max2=-41534,mix1=-41534,mix2=-41534;
                     ^~~~
/in/foo.cc:85:33: warning: unused variable 'mix1' [-Wunused-variable]
     int max1=-41534,max2=-41534,mix1=-41534,mix2=-41534;
                                 ^~~~
/in/foo.cc:85:45: warning: unused variable 'mix2' [-Wunused-variable]
     int max1=-41534,max2=-41534,mix1=-41534,mix2=-41534;
                                             ^~~~
/in/foo.cc: In function 'int prim(int)':
/in/foo.cc:175:23: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
         if (edge_ind&1==1)
                      ~^~~
/in/foo.cc:192:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^