Company Name: Amazon

Job Role: SDE Intern (6-Month)

Years of Experience Required: Fresher (0 Yrs.)

Drive: Off-Campus (Referral)

CTC: Rs. 80K/Month

Preparation for Amazon

Preparation

Topics: Data Structures and Algorithms

Duration: 1.5 years

Source of Preparation: Codechef,  Leetcode, GFG, Striver’s SDE sheet.

[BONUS]:

• Check Striver’s SDE Sheet for Interview Preparation.
• Check the ultimate resume building guide for coding interviews.
• Blind 75 Leetcode

Amazon Interview Rounds

Interview Rounds

Round 1: Online Coding Test

It was divided into 5 sections:

1. 7 debugging questions- Easy
2. 2 Coding Questions-Find longest Subarray with unique characters. 

• Find the longest Subarray with unique characters.  O(n²) was also accepted.

• Write algorithm for Amazon Store where we were given the time for query for the user and their direction(enter/exit). We had to return the vector with time at which the user will complete the action. Some conditions were also given. (Don’t remember the question exactly)-

I used the Priority queue and was able to clear 6 out of 11 test cases.

3. Behavioral questions
4. Aptitude Questions
5. Survey.

Round 2: Technical Interview 1 on Amazon Chime (1 Hour)

Topics asked: BST, BFS.

Problems:

The interviewer was quite friendly. The interviewer introduced himself and then asked for my introduction. 

Problem 1: Create BST from a given string.

Input: 1 2 3 4 N N N

Output:

Problem 2: Find a pair with given sum in BST (2-Sum In a BST).

Only a Discussion happened for this Question. No Code was required. The Interviewer was satisfied with O(N) Time and O(N) Space i.e., converting BST to sorted array and using 2 pointers to find the pair.

Problem 3: Rotting Oranges

I was able to solve both questions in just under 1 hour with the optimized approach. Then he asked if I had any questions.

Round 3: Technical Interview 1 on Amazon Chime (1 Hour)

Topics asked: Recursion and Backtracking, Simple Array-Based Question.

Problems:

The interviewer introduced himself and then asked for my introduction. 

The Interviewer asked a behavioral question that explains a situation when you have to learn something from scratch.

Problem 1: Write a program to print all Anagrams of a given string.

Problem 2: Two Sum. (Sorted and Unsorted Array)

Problem 3. Three Sum. (Discussion Only)

I was able to give a satisfactory explanation and solution in around 45 min with the optimized approach. Then he asked if I had any questions.

Verdict: Selected

Message to Aspiring Students: –
Consistency is the key to success. You have to have to sit for at least 2 hours daily irrespective of any reason until you get success. The most commonly asked 300-400 questions should be on your tips.

~Anynomous