Question: 11.14 The breadth-first programs of this chapter only check for repeated nodes that appear in the same candidate path. In graphs, a node can be

11.14 The breadth-first programs of this chapter only check for repeated nodes that appear in the same candidate path. In graphs, a node can be reached by different paths. This is not detected by our programs, which, therefore, duplicate the search below such nodes. Modify the programs of Figures 11.10 and 11.11 to prevent this unnecessary work.

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