This game takes two words of equal length and sees if it can permute the source word into a the destination word in a certain number of hops. Each hop, the word is only allowed to alter one letter at ...
3. DFS 做unique permutation: given input有duplicate characters。 Given a string s, return all the palindromic permutations (without duplicates) of it. Return an empty list if no palindromic permutation ...
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