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Connecting Cities With Minimum Cost (medium)
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Problem Statement

You have n cities labeled from 1 to n. You are given an integer n and a list of connections where each connection is represented as [x<sub>i</sub>, y<sub>i</sub>, cost<sub>i</sub>]. This means that there is a bidirectional road between city x<sub>i</sub> and city y<sub>i</sub> with a cost of cost<sub>i</sub>.

Return the minimum cost to connect all the cities so that there is a path between any two cities. If it's not possible to connect all cities, return -1. The total cost is the sum of the costs of the connections used.

Examples

  1. Example 1:

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