Amazon Interview Experience SDE 2 Archives

Got a message from HR on Linkedin that my profile has been shortlisted for SDE-2 profile

He sent me Invite for Interview in Amazon Gurgaon Office

Round 1 (Written Round)

Return Nth Node from the back of the linked list

https://www.geeksforgeeks.org/nth-node-from-the-end-of-a-linked-list/

Zigzag Traversal of Tree

https://www.geeksforgeeks.org/zigzag-tree-traversal/

Max length path between any two points in the given N*M matrix such that all elements in that path are in increasing order

https://www.geeksforgeeks.org/find-the-longest-path-in-a-matrix-with-given-constraints/

Round 2 (DS/Algo Round)

Find the node in the linked list having a cycle where the loop starts.

https://www.geeksforgeeks.org/find-first-node-of-loop-in-a-linked-list/

I gave him well known slow and fast pointer solution instantly.

Then he told me to do the calculation and derive the formula why the above solution works.

I did the same.

Find two nodes where the sum is equal to a given sum in a BST.

https://www.geeksforgeeks.org/find-a-pair-with-given-sum-in-bst/

I didn’t know the stack solution so I thought in other direction.

I asked him can I modify the tree to which he replied YES.

I told him that we can convert the BST into DLL and then traverse the DLL taking two pointers one from each side and get the nodes with the given sum.

Since the time complexity was O(n) in this case so he got satisfied.

Round 3( Design Round)

Asked me about my projects in the current company.

Asked me to design High-level design for Latency Management System.

Asked me to design Low-level design for Library Management System.

Since I didn’t do well in design round, they considered me for SDE-1.

Round 4 (DS/Algo Round)

Edit Distance Problem of DP

https://www.geeksforgeeks.org/edit-distance-dp-5/

Water Trapping Problem

https://www.geeksforgeeks.org/trapping-rain-water/

Find maximum element in the sliding window of k elements in an array

https://www.geeksforgeeks.org/sliding-window-maximum-maximum-of-all-subarrays-of-size-k/

Then I was told by the HR to fly back to Chennai next week for further rounds. He arranged everything from flight tickets to accommodation.

Round 5(Managerial Round)

Discussed my current profile and projects in my current company.

Why I want to leave my current company.

Long Discussion about my projects.

One of my projects was to develop a notification service.

He found it of his interest and asked for a detailed explanation. He asked the difference between a service and program.

What is thrashing?

My 3 most challenging tasks I have worked on.

My 3 most boring tasks I have worked on.

My 3 strengths.

My 3 weaknesses.

Do you have ever faced a situation in which you have to stretch yourself?

As a child how did you see your future?

What is your favourite data structure and why?

What is O(n) and what’s its use?

Will you be able to relocate to Chennai?/ Do you have issues with relocation?

There was a lot of cross-questioning and he noted everything whatever I was saying.

Round 6(Bar raiser)

Discussed my current profile and projects in my current company.

Do you have issues with relocation? He told me a lot of candidates come here and then try to relocate back to other locations.

He took a deep dive into one of my projects and asked me questions like

What challenges you faced while doing this project and how you resolved them.

Why do you want to join Amazon?

In the end, he gave me a simple question to solve.

There is an array of integers, replace every number with its next greater element.

https://www.geeksforgeeks.org/replace-every-element-with-the-greatest-on-right-side/

Verdict: Got selected 🙂

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Written Round: (1 hour)

Given a linked list and K, print the last K nodes in reverse order.
example: 1->2->3->4->5->6, K = 3 output: 6 5 4
Find out whether the given tree is BST or not.
Rotate Given matrix by 90 clockwise.

Technical Round: (1 hour)

Given an array, for every element in the array, you need to print the product of all except the ith element itself.
Given N train with their arrival and departure timings, you need to find the minimum number of platforms are required to accommodate all. The condition is, no train has to wait to get the free platform.

Technical Round: (1 hour)

Define your own data structure that should do two operations at its best complexity.

insert(num): insert num into the data structure.
find(sum): return a pair(a, b) such that a+b = sum, if no such pair exists return -1.

2. Give a graph find out whether it is a tree or not.

Managerial Round: (1 hour)

Long discussions on my projects.
Have you disagreed with your manager’s opinion?
Technical Challenges faced so far in the current role?
Any technical solution provided by you to your team? Why your solution was better? and what was the outcome?
Why are you looking for opportunities?
Why Amazon?

Bar Raised Round: (1 hour)

Long discussions on my project and current role?
Long discussion on the trie data structure, comparison with other data structures.
Why are you leaving your current role?
Why Amazon?
Given an array of integers, find out the range of contiguous elements with Largest sum. (Kadane’s algorithm)

Please Improve this article if you find anything incorrect by clicking on the “Improve Article” button below.

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