Disqus Interview Question: Write a Unix glob implementat... | Glassdoor

Interview Question

Senior Python Software Engineer Interview San Francisco, CA

Write a Unix glob implementation in python. Globbing lets

  you use * for zero or more characters, ? for a single character, [] for a character range.
difficult, recursive algorithm

Interview Answer

1 Answer


The key to this problem is recursion and avoiding quadratic complexities, so you need to convert your text into words and then compose those words into a trie (not tree) of indexed characters. You then traverse that trie, recursing as necessary, to produce a list of matching words and their indices into the original text.

Note: I made the whole search corpus into a trie, and I shouldn't have for maximum points. I should have only trie-d the first three or four characters and used linear matching for the rest of the words into order to save on memory.

Interview Candidate on May 4, 2012

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