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I'm not sure what you mean with "broken edges" and "node with no connected edge". If it helps, look up the meaning of "directed edge" and "in-degree" in the context of graph algorithms.
Good luck!
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Project Euler #79: Passcode derivation
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I'm not sure what you mean with "broken edges" and "node with no connected edge". If it helps, look up the meaning of "directed edge" and "in-degree" in the context of graph algorithms. Good luck!