Hello everyone, I have some trouble in ps6 problem 3. I don't know how to change the complexity of is_valid_word from O(len(word_list)) to O(1) by change the arguments.

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Hello everyone, I have some trouble in ps6 problem 3. I don't know how to change the complexity of is_valid_word from O(len(word_list)) to O(1) by change the arguments.

MIT 6.00 Intro Computer Science (OCW)
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use a dictionary?? http://wiki.python.org/moin/TimeComplexity
Using a dictionary is exactly the right idea. Recall that the dictionary works using hashing which allows us to search in constant time. Think about changing the input of is_valid_word from word_list to a dictionary such as points_dict .

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