Implementation issue

#1

sir how to implement union by rank then?

#2

@Rj.25

In this approach we use the size of the trees as rank,
we attach the tree with the lower rank to the one with the bigger rank.
you can have a look at this link for the implementation, feel free to ask if you have any doubts left.
https://cp-algorithms.com/data_structures/disjoint_set_union.html#toc-tgt-3