What category this question belongs to?

I found this interesting problem and couldn’t able to solve it.
Can you help me identify the category of this problem? so that I can practice similar questions.
so far my understanding is, we have to calculate the numbers of groups.
For example, Suppose pair of friends are
A B, D B, R G, T G
so there are two groups
first one is A B D, second is R T G.
so the answer is 1 because we can convert this into one group by just making one friendship between the first group and second group.
below is the problem statement.


Read about connected components in a graph and disjoint sets union.

1 Like


1 Like