In the algorithm for spelling suggestions in this week's assignment, there was a hash set to mark Strings as visited. What is the BEST ANSWER for why we used the visited set?

Question

Answer

To avoid testing to see if a mutated String was a real word (and hence a spelling suggestion) more than once.

Answer

To avoid exploring all the possible String mutations for an individual String more than once.

Answer

So that our exploration was of a tree of words, and if we had a word repeated, it wouldn't be a tree anymore.

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In the algorithm for spelling suggestions in this week's assignment, there was a...

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