Amazon Web Services Software Developer Intern Interview Questions and Answers

45 minutes
arrays, strings,
SHL

• Q1. Find number of nodes in a tree and it's time complexity
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• Q2. What is abstraction and how do you implement it ??
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• Q1. What is the minimum number of coins to reach the target with the coins 1,2,5
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• Q2. Byte stream to human readable format without using library
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1hr mostly was c questions focusing on pointers, arrays and strings. Few logical questions were there too

2hrs, 5 questions. 1 easy and 4 medium. All leetcode type problems with arrays, strings and matrix

2hrs, simple application development like creating a backend for shopping application. Only simple functions like adding products, quantity, ordering, if quantity is not there then refuse the order and such. Was not asked for DB implementations.

• Q1. How to merge a list of sorted arrays in sorted order?
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• Q2. Simple discussions about oops, project etc
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• Q1. Self introduction for 2 mins
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• Q2. Why do you want to join Zoho?
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• Q3. What kinda word does Zoho do
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Coding round was there. Two coding questions were asked to solve in 1 hour. The difficulty was easy to medium.Leetcode questions of arrays and strings.

• Q1. It was an online tech interview. There were two panelists. One asked me about my projects and gave me one coding question to solve which was based on matrices. ...read more
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• Q2. After solving the question. In the same interview zoom meet HR asked me something about me and my family and thats it.
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OnCampus Test including DSA Questions

• Q1. Introduce yourself
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• Q2. DSA Question based on Dynamic Programming
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Round duration - 90 Minutes
Round difficulty - Easy

It was a telephonic round. The interview asked me these questions.
 

• Q1. Puzzle You have two ropes coated in oil to help them burn. Each rope will take exactly 1 hour to burn all the way through. However, the ropes do not burn at con...read more
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• Q2. Technical Questions

  1. Dynamic memory allocation for 2d array
  2. How polymorphism works in C++(Vptr and Vtable implementation)
   

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Round duration - 60 Minutes
Round difficulty - Medium

The interviewer started asking me questions. He gave me 2 problems. He was giving hints in case of any issues.
 

• Q1. Maximum Frequency Number Ninja is given an array of integers that contain numbers in random order. He needs to write a program to find and return the number whi...read more
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• Q2. System Design Question There is an online catalog of songs (Like Saavn or Gaana). How you will show favorite songs every day to users. An efficient algorithm re...read more
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Round duration - 60 Minutes
Round difficulty - Medium

This was a technical interview. He gave me these questions one by one.
1. Again, how polymorphism works. Draw vtable and vptr
2. Producer consumer problem with synchronization
3. Difference between mutex, semaphore, and condition_variable.
4. Design parking lot system
5. Zigzag traversal of binary tree

• Q1. System Design Question

  Design parking lot system

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• Q2. Zigzag Binary Tree Traversal Given a binary tree, return the zigzag level order traversal of the nodes' values of the given tree. Zigzag traversal means sta...read more
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Round duration - 90 minutes
Round difficulty - Medium

1. He asked about the producer-consumer problem but I told him that the same question is asked in the previous round.
Then interviewer went asking lots of questions related to producer and consumer. Lots of discussions like what is a writer is not there and the only reader is there and you need to find out how many readers are currently reading from the buffer.
2. Discussions about C++11 features. How thread and async is different
3. Design your own shared_ptr(How you will handle ownership)
4. Check If the binary tree is symmetrical.
5. Find elements in a rotated sorted array and then optimize it.

• Q1. Tree Symmetricity You are given a binary tree, where the data present in each node is an integer. You have to find whether the given tree is symmetric or not. S...read more
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• Q2. Search In Rotated Sorted Array You have been given a sorted array/list ARR consisting of ‘N’ elements. You are also given an integer ‘K’. Now the array is rotat...read more
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Round duration - 90 mintues
Round difficulty - Easy

Timing it is around 11 am and Environment is good .

• Q1. Reverse Stack Using Recursion Reverse a given stack of integers using recursion. Note: You are not allowed to use any extra space other than the internal stack ...read more
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Round duration - 90 minutes
Round difficulty - Medium

Environment was very friendly but questions asked are very hard.

• Q1. Maximum subarray Ninjas has been given an array. He wants to find a subarray such that the sum of all elements in the subarray is maximum. Subarray 'A' ...read more
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• Q2. Intersection of Linked List You are given two Singly Linked List of integers, which are merging at some node of a third linked list. Your task is to find the da...read more
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Cf questions asked of rating 1400

• Q1. What is ts & why we should use over js
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• Q2. System design question of Netflix
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