Given a list, create a new list that does not include the duplicates of the original list.
Data Scientists Interview Questions
54,225 data scientists interview questions shared by candidates
pros and cons of random forest and why
How to test a fair coin?
How many sub-spaces can 4 lines divide in 2D? How many sub-spaces can 4 hyperplanes divide in 3D?
Sample k items uniformly at random in a streaming fashion from a list of unknown length.
Case study
10 questions to do in 2 hours.
what is entropy
3 questions, two sql+ 1 python (though can be also easily solved with sql). The sql question is about finding the most popular track and for each track, the day it had most popularity. the python question is about adding certain advs. seconds on every 3,5,15 stream a user had. The interviewer appears having limited experience with sql, as both interviewers had moments first doubting my code, then admit they made mistake. As one example, when doing an inner joining of two tables I had 'From tableA a, tableB b where a.metric=b.metric, the interviewer first asked me where's my inner joining of the two tables, as in her mind it should be written as 'From TableA a inner join TableB b on a.metric=b.metric'. After I explained, she realized both ways writing are equivalent. Though I got all three questions right and well explained, I did not pass the tech interview and there was no feedback.
Given a cube and a random walker on the cube, find the expected value of the # of steps that the random walker takes to reach the opposite vertex of the cube.
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