Fix AttributeError in NQueensProblem (Issue #1308)#1309
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Fixes Issue #1308
This PR fixes the AttributeError: 'NQueensProblem' object has no attribute 'graph' in search.ipynb. The issue occurs because
tree_depth_search_for_visexpects a graph attribute, which NQueensProblem does not have.Changes Made:
tree_depth_search_for_visandtree_breadth_search_for_visto handle problems without a graph attribute.depth_first_tree_search(nqp)andbreadth_first_tree_search(nqp)to correctly access .solution().plot_NQueens.