2 medium questions and 1 hard
Developer Big Data Interview Questions
731,244 developer big data interview questions shared by candidates
SQL question: 1 table with player_id, log in date, and 2 other fields and was asked to calculate first day retention rate. First day retention rate is defined as the player who log in the 2nd straight day, after the first ever time they log into game.
Write an algorithm to return the intersect of two arrays.
Q3) Few questions on design patterns(Interpreter/ Observer/State) etc.
1) Given an array of numbers where each number has a duplicate except one, write a program to return the lone number.
What is binary search tree? Whats the time complexity of inserting? deleting? seaching? What's the time complexity for the worse case?
Given two (huge) sets, what is an efficient way to find their intersection?
Test if a Binary tree is BST or not
You need to design a system to provide answers to factorials for between 1 and 100. You can cache 10 numbers. How would you arrange/manage that cache, and what is the worst case for lookup on a cache miss?
Given an integer N and an array of unsorted integers A find all pairs of numbers within A which add up to N. (This is the only question I can remember and I had trouble thinking of an answer at the time)
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