Amazon Online Assessment (OA) - Min Cost to Repair Edges (Minimum Spanning Tree II)
There's an undirected connected graph with n nodes labeled 1..n. However, some of the edges have been broken, disconnecting the graph.
Find the minimum cost to repair the edges so that all the nodes are once again accessible from each other.
Input
n, an int representing the total number of nodes.
edges, a list of integer pairs representing the nodes connected by an edge.
edgesToRepair, a list where each element is a triplet representing the pair of nodes between
which an edge is currently broken and the cost of repairing that edge, respectively (e.g. [1, 2, 12] means to repair an edge between nodes 1 and 2, the cost would be 12).
Examples
Example 1:
Input: n = 5, edges = [[1, 2], [2, 3], [3, 4], [4, 5], [1, 5]], edgesToRepair = [[1, 2, 12], [3, 4, 30], [1, 5, 8]]
Output: 20
Explanation:
There are 3 connected components due to broken edges: [1], [2, 3], and [4, 5].
We can connect these components into a single component by repairing the edges between nodes 1 and 2, and nodes 1 and 5, at a minimum cost of 12 + 8 = 20.
Example 2:
Input:
n = 6, edges = [[1, 2], [2, 3], [4, 5], [3, 5], [1, 6], [2, 4]], edgesToRepair = [[1, 6, 410], [2, 4, 800]]
Output: 410
Example 3:
Input:
n = 6, edges = [[1, 2], [2, 3], [4, 5], [5, 6], [1, 5], [2, 4], [3, 4]], edgesToRepair = [[1, 5, 110], [2, 4, 84], [3, 4, 79]]