Determine if a string has all unique characters [Cracking the Coding Interview] [BitVector] | Part-3

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Does the String has all Unique Characters is the first question in "Cracking the Coding Interview" by Gayle Laakmann Mcdowell. Solved using BitVector.

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Cracking the Coding Interview has become the defacto Bible for preparing for your coding interviews. I think this is for good reason; it's an awesome book with a ton of good practice coding interview problems.

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Finally a good video showing bit manipulation algos step by step. I couldn't wrap my head around this example until I saw this. Thank you!

jamesc

Such a good explanation. People learn better when we are taught using diagrams or animations showing what's actually happening. Thanks a lot.

codestorywithMIK

Thank you very much for this explanation! So far the only youtube video that explained this solution very well detailed step by step! Every other video on Youtube use additional space

irynasherepot

Thanks for teaching another bit manipulation solution.

norielgalang

Thanks this helps a lot! So nicely explained

anjonroy

Explanations are amazing.Please do videos on all the questions from CTCI Book.

codebuzz

Could you please explain how the time complexity became o(1) when we are iterating over all the n characters of a string? Explanation is really good

srivalli

While explaining you have shown checker as array but in code its constant. Can you please tell if its array or a constant

meghanareddy

Time complexity is still O(n), but space is now O(1).

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