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4. (15 points) Dijkstra's algorithm assumes no negative-weight edges. But it therefore does allow zero- weight edges. Explain why negative-weight edges cause a problem

4. (15 points) Dijkstra's algorithm assumes no negative-weight edges. But it therefore does allow zero- weight edges. Explain why negative-weight edges cause a problem (even if a negative cycle does not result) but zero-weight edges do not.

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