Shortest Path Between A and B

Prereq: BFS on Graph

Given an (unweighted) graph, return the length of the shortest path between two nodes A and B, in terms of the number of edges.

Input:

1graph: {
2  0: [1, 2],
3  1: [0, 2, 3],
4  2: [0, 1],
5  3: [1]
6}
7A: 0
8B: 3

Output: 2

You can use the BFS template from BFS on graphs as your starter code.

Try it yourself

Explanation

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1  >>> a = [1, 2, 3]
2  >>> a[-1]
3  3

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