Kruskal's Algorithm using union find
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Kruskal's algorithm is a greedy algorithm in graph theory that finds a minimum spanning tree for a connected weighted graph.
This means it finds a subset of the edges that forms a tree that includes every vertex, where the total weight of all the
edges in the tree is minimized. If the graph is not connected, then it finds a minimum spanning forest (a minimum spanning
tree for each connected component).
A union-find algorithm is an algorithm that performs two useful operations on such a data structure: