DSU datastructure: map <ll,ll> urank doesn't work

[sparsh2]

void create(ll x) { parent[x] = x ; urank[x] = 0 ; // rank = no. of nodes in its subtree }

In the above create function, urank[x] has to be set to 1. If not this does not serve any purpose. urank of any element will always remain 0

[salmandotexe]

Agreed, it was previously 1, idk why it was set to 0.
in the merge function there should also be a check if xroot==yroot then return. but urank[x] =0; is a major issue.