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POFinding palindromes of real words
 

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  1. POFinding palindromes of real words
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    <p>I just read the question <a href="https://stackoverflow.com/questions/8447222/anagram-of-a-palindrome">Anagram of a Palindrome</a> which lead me to some other palindrome questions. But when I think of a palindrome, I think of real world palindromes that use real words from a language and make some degree of sense in that language.</p> <p>So, if we give up on grammar and meaning as too difficult, what we be a good algorithm for finding palindromes that are comprised of words in a dictionary? You can pre-process the dictionary into a data structure that makes it easier. You can't pre-process the dictionary by finding every possible palindrome, unless you've got a way to do that in a realistic amount of computing time and space.</p> <p>Assume you want to find palindromes up to 100,000 characters and you have a dictionary of 100,000 lower case English words.</p> <p>Bonus points if you can come up with a way to quickly find anagrams of palindromes as well. I'm not sure there is a feasible way to do that though.</p> <p>Edit - there seems to be some confusion, so I must not have been clear enough. I'm looking for sequences of words (up to 100,000 characters in length) that are palindromes, not single dictionary words, which is a trivial problem. So, any number of "a"s or "i"s are palindroms, since each one is word and the sequence is a palindrome. "amanaplanacanalpanama" is also a palindrome, because "a", "man", "plan", "canal", and "panama" are words (if "panama" is really in this dictionary)</p>
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    1. COIs this an interview or a question?
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    2. COhow many real-world words contain up to 100,000 characters?
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      1. USDMac the Destroyer
    3. CO@DMactheDestroyer I believe he meant you can combine real works out of the dictionary to form palindromes up to 100,000 characters in length, if we take out the context of the grammer not making sense.
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      1. USDan W
 

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