Amazon Interview Experience | Set 255 (On-Campus)

Amazon visited our campus. It started with a online coding round and followed by one telephonic and then 3 face to face interview and again a telephonic interview. All interview rounds started with brief introduction about me.

Round 1(Online Coding Round):
Asked 2 coding question and 20 mcq from Computer science fundamentals (OS, DS, DBMS, Networks etc.)

1) Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raining.

   Input: arr[]   = {2, 0, 2}
   Output: 2

2) Check whether two strings are anagram of each other.

Round 2 (Telephonic round):

1) Tell me about yourself.

2) Vertical Sum in a given Binary Tree

3) Project Discussion

Round 3 (f2f onsite):

1) Tell me about yourself.

2) Sort a linked list of 0s, 1s and 2s

3) Find duplicates in O(n) time and O(1) extra space.

Round 4 (f2f onsite):

1) Design a data structure that supports insert, delete, search and getRandom in constant time

2) Given a continuous input stream of integers, can you find the maximum N numbers at any given instance?

3) lca of k nodes in given bst

4) K’th largest element in a stream

5) Lowest Common Ancestor in a Binary Search Tree.

Round 5 (f2f onsite):

1) Floor and Ceil from a BST

2) Find the two numbers with odd occurrences in an unsorted array

3) Find the Number Occurring Odd Number of Times

4) Project Discussion

Round 6 (Telephonic round):

1) Tell me about yourself.

2) Most proudest moment in last one year.

3) Most regretted moment in last one year.

4) Asked about what data structure and alogithms did i know then asked what is segment tree.

5) Reverse the stack using recursion

6) External merge sort

7) Project Discussion

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