Create a queue and a set.
The graph can be represented as follows:
Node 0: (1, 15), (2, 10)
Node 1: (0, 15), (3, 5), (4, 20)
Node 2: (0, 10), (3, 10), (5, 5)
Node 3: (1, 5), (2, 10), (4, 10), (5, 15)
Node 4: (1, 20), (3, 10), (6, 5)
Node 5: (2, 5), (3, 15), (6,
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