Amazon interview experience Real time questions & tips from candidates to crack your interview

SDE - 1

Amazon

3 rounds | 7 Coding problems

Sourav Kumar

Fresher | Sep 2020

Selected

Interview preparation journey

Preparation

Duration: 8 Months

Topics: Data Structure, Algorithms, Machine Learning, Operating System, DBMS

Tip

Tip 1 : Practice atleast 250-300 questions on coding platforms like leetcode,gfg and interviewbit
Tip 2 : Keep revising the theoritical topics like os,dbms and computer networking
Tip 3 : You must bevery well versed and should be able to explain the projects that you have mentioned in your resume.So practice for that too

Application process

Where: Campus

Eligibility: Above 7 CGPA

Resume tip

Tip 1 : Don't make a fancy resume.make a simple resume and mention all your relevant projects and work experience.
Tip 2 : Don't write anything in your resume that you don't have a good knowledge of.If the interviewer asks some questions relating to the topic you have mentioned you should be able to explain that clearly otherwise it will create a very negative experience.

Interview rounds

Round

Medium

Online Coding Interview

Duration120 Minutes

Interview date10 Sep 2020

Coding problem2

Started at 3:00pm
Could be given at home with camera on in fullscreen mode.
Throughout the round,the camera was on and we were not allowed to open any other tab.

1. Subtree of Another Tree

Easy

10m average time

90% success

0/40

Asked in companies

Given two binary trees T and S, check whether tree S has exactly the same structure and node values with a subtree of T, i.e., check if tree S is a subtree of the tree T.

Try solving now

2. Pair Sum

Easy

15m average time

90% success

0/40

Asked in companies

You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to return the list of all pairs of elements such that each sum of elements of each pair equals 'S'.

...

Try solving now

Round

Medium

Video Call

Duration30 Minutes

Interview date20 Nov 2020

Coding problem2

It was in the morning(around 11 am)
I received a google meet link on my mail and the interview was taken on google meet
The interviewer was very nice.He asked some basic questions about myself.
Then he asked about the projects I had done and my favorite topic and after some questions he moved towards the coding part.

1. Running Median

Hard

46m average time

50% success

0/120

Asked in companies

You are given a stream of 'N' integers. For every 'i-th' integer added to the running list of integers, print the resulting median.

Print only the integer part of the median.

Try solving now

2. Smallest Window

Moderate

10m average time

90% success

0/80

Asked in companies

You are given two strings S and X containing random characters. Your task is to find the smallest substring in S which contains all the characters present in X.

Example:

Try solving now

Round

Medium

Video Call

Duration40 minutes

Interview date22 Apr 2021

Coding problem3

It was around 2 at noon
The interview took on google meet
The interviewer was good and humble.

1. OS Questions

How would you solve the problem of critical section(apart from using semaphores)
Difference between multiprogramming and multitasking.
What is Kernel and types of Kernel