(e->topsize*A[e->head->index][e->head->index]
+ A[e->head->index][v->index]) / (e->topsize+1);
/*2-dist for e->head (v,newNode,left,right)
taken care of elsewhere*/
/*3-dist with e->head either taken care of elsewhere (below)
or unchanged (sib,e->tail)*/
(e->topsize*A[e->head->index][e->head->index]
+ A[e->head->index][v->index]) / (e->topsize+1);
/*2-dist for e->head (v,newNode,left,right)
taken care of elsewhere*/
/*3-dist with e->head either taken care of elsewhere (below)
or unchanged (sib,e->tail)*/