Problem Link :
**Author:** Amrutansu Garanaik
, Abhishek Patnaik
**Tester:** Keshow Sablaka, Amit Das
**Editorialist:** Amrutansu Garanaik
, Amit Kumar Sahu
Given a set of nodes of a graph and edges connecting the nodes. Then some queries of the form a b are given. You have to print whether or not a and b are in same connected component of the graph.
The problem is a simple application of union-find algorithm. Union-find algorithm creates sets of elements present in same connected component. For an edge connecting node a and b, use union(a,b). The find operation works in O(logn) time and gives the answer. If find(a) == find(b), then both nodes are in same component, otherwise they are in different components.
Union-find algorithm can be learnt here
Note : We can also perform a dfs or bfs on the graph to find the answer, but the constraints were high preventing this approach.