Create an API and implementation that solves the multisource shortest-paths problem on edge-weighted digraphs with positive edge weights using Dijkstra's algorithm: Find a shortest-paths forest given a collection of sources, allowing the creation of a method that delivers to clients the shortest path from every source to any vertex. Add a dummy vertex with a zero-weight edge to each source, or start the priority queue with all sources and set their distTo[] entries to 0.

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