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The following question was the programming question during the second phone interview. The coding portion was conducted using Stypi (similar to Google Docs). I was allowed to use my language of choice (Python) rather than being forced to use Java. I was asked to write a routine to verify that all the words in the solution of a crossword puzzle were valid words. The crossword puzzle was represented as a two-dimensional array of single-character strings (and empty strings for the empty blocks). While this question is pretty straightforward, but there is a "better" solution than others which seemed to pique the interest of the interviewer—see the answer section for details. It is also worth pointing out that I later found that certain technical details of my solution were incorrect, but either the interviewer didn't notice or didn't care. I think the question was intended more to see how I work.
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Forward Deployed Engineer

Interviewed at Palantir Technologies

3.7★
Mar 5, 2013

The following question was the programming question during the second phone interview. The coding portion was conducted using Stypi (similar to Google Docs). I was allowed to use my language of choice (Python) rather than being forced to use Java. I was asked to write a routine to verify that all the words in the solution of a crossword puzzle were valid words. The crossword puzzle was represented as a two-dimensional array of single-character strings (and empty strings for the empty blocks). While this question is pretty straightforward, but there is a "better" solution than others which seemed to pique the interest of the interviewer—see the answer section for details. It is also worth pointing out that I later found that certain technical details of my solution were incorrect, but either the interviewer didn't notice or didn't care. I think the question was intended more to see how I work.

Given an array/list that contains boolean values for a system being in a failed state, figure out the fastest way to find the index of the first version that failed given that once the system fails it remains in the failed state. For e.g. given a list like [False, False, False, False, ...., False, True, True, True, True, True], write an algorithm that finds the index of the FIRST occurrence of 'True' in the FASTEST time.
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Forward Deployed Engineer

Interviewed at C3 AI

3.1★
Sep 29, 2018

Given an array/list that contains boolean values for a system being in a failed state, figure out the fastest way to find the index of the first version that failed given that once the system fails it remains in the failed state. For e.g. given a list like [False, False, False, False, ...., False, True, True, True, True, True], write an algorithm that finds the index of the FIRST occurrence of 'True' in the FASTEST time.

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