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You need to make sure that the compiler has access to the classes. There are several ways to do this depending on how you're compiling your code as well as what they're providing you, such as source...

It's the exact same Dijkstra's algorithm. I have no idea what the treeWeight method is (I didn't look at the code), but I'm pretty sure that getShortestPath() returns a list of nodes which comprise...

There are a few different ways to represent graphs (well, there are actually more than two but these are probably the easiest two): via a matrix, or via a jagged list. Without going into too much...

fi is short-hand for "end if" (or a backwards if).

Line 3 sets the shortest distance from any other node to the start node at infinity (the furthest distance away). The reason for this is so any...

If you saw the animation on Wikipedia, just replace all the edge costs with 1 and you'll have an un-weighted map. Their pseudo-code can be used verbatim and all you need to do is pass in the correct...

That's simple, just run Dijkstra's algorithm using an un-weighted map (every connection is weighted the same).