Discussion
What is the effect of using graph search on a grid problem?
Answer: A
Storing expanded states means each is expanded once, so the work becomes proportional to the number of states rather than to the number of paths, which is a change of complexity class. Memory rises rather than falls, and the solution found and the completeness are unchanged for breadth first. A structural change that alters the exponent is worth far more than any constant factor, and it is bought here with memory.
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