Amazon Research Analyst Interview Questions, Process, and Tips

Medium to Hard 4 DSA questions

Q1. CV discussion and question related to python and data science
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Q2. Cumulative sum of an array, frequency of each word in a sentence
Ans. 
The question asks about calculating cumulative sum of an array and frequency of each word in a sentence.
• To calculate cumulative sum of an array, we can use a loop and keep adding the current element to a running sum variable.

• To calculate frequency of each word in a sentence, we can split the sentence into words and use a dictionary to keep track of the count of each word.

• We can use built-in functions in programming lan...read more
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Q1. Behavioural Questions
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Q2. Leadership principles
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Q1. Data Science and SQL round
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Q2. Groupby, joins and window functions
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Q1. CV discussion and data science question
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Round duration - 60 minutes
Round difficulty - Medium

Started with project description, deep dive into project
Questions about ML, Statistics
Coding questions for Python, SQL

Q1. Stream Of Characters
You are given a list, ‘DICTIONARY[]’ containing a list of words and a stream of characters (queries). Your task is to choose a suitable data structure to implement ‘CharacterStreamChec...read more
Ans. Brute Force
The idea is to use the brute force approach for this problem. At every queried character, we will form strings in a backward direction and will simultaneously check for the string in the ‘DICTIONARY’. If we found the string, then return true. Otherwise, check till the first queried character. If still no string found in ‘DICTIONARY’, return false.
 
Note:
1. For faster search, we can store the strings present...read more
Answered by CodingNinjas
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Q2. SQL Question
Second highest salary in SQL
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Round duration - 60 minutes
Round difficulty - Easy

Projects
Machine Learning

Q1. Aptitude Questions
Questions about Statistics
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Round duration - 60 minutes
Round difficulty - Easy

Behavioral Round
Questions asked about Amazon Leadership Principles

Q1. Basic HR Questions
About behavioral questions. No standard questions, each question needs to be answered using STAR method and must represent Amazon's Leadership Priniciple
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Round duration - 60 minutes
Round difficulty - Easy

Medium Python questions
Medium SQL questions

Q1. Ninja and Mathematics
Ninja is a genius in mathematics. He got an interview call from MIT. During the interview, the professor asked Ninja a challenging question.
Given two integers 'N1' and '...read more
Ans. Remainder Theorm
The idea is to notice that the fractional part repeats only when we have already seen the same remainder before. So, that means we have to store the end index where this repetition starts in some data structure. 
 
We can use Map / HashMap / Dictionary to store the remainder and its associated index while doing division so that whenever the same remainder comes up, we know there is a repeating f...read more
Answered by CodingNinjas
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Q2. SQL Question
Find top 2 salary for each department in SQL
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