What is the computational complexity of finding the most frequent word in a document?
Data Scientist Interview Questions
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Suppose you have a list of strings, each of which is an English sentence. # Output a dictionary out_dict that maps a key n to the list of words that occur in n different sentences. # E.g. # Input: str_list = [ “The cat ate the fish”, “The cat saw the roses”, “The roses are red” ]
How to reverse strings with changing Position - Answered
Technical case interview which is a mix of modelling skills + classical case interview structure
How do you take millions of users with 100's of transactions each, amongst 10k's of products and group the users together in a meaningful segments?
Asked coding and data flow questions. The interviewers were friendly, but the questions were more centered on computer science than I expected. There were no social or general case study type questions.
The data challenge is pretty standard, give you a data set and let you build a predictive model and put together some insights. Phone and onsite interviews are all technical interviews. Some statistics (sampling, hypothesis testing, power calculation, etc.), some product sense (whether to launch some features, why some metric changed, etc.), also a CS-like question.
How many colors do you need to paint a graph that is built from a union of two trees?
behavioral questions about location and fit
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