/in/foo.cc: In function 'int getsum(int, int)':
/in/foo.cc:73:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:100:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<ha[x].size();i++){
                ~^~~~~~~~~~~~~
/in/foo.cc:84:13: warning: 'rt' may be used uninitialized in this function [-Wmaybe-uninitialized]
  dfs2(rt,rt);
             ^