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.

Input: 

graph: {
  0: [1, 2],
  1: [0, 2, 3],
  2: [0, 1],
  3: [1]
}
A: 0
B: 3

Output: 2

Title

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

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