Amazon visited our campus for summer internship. I prepared from Amazon Interview Sets which were pretty helpful!
Here is my experience :
They had an online aptitude test on day 1. It was 90 minutes: 20 MCQs + 2 coding questions (choice between C/C++/Java for coding). MCQs were based on DSA, OS, and Math. They were apparently difficult.
Two Coding Questions :
1. Keypad problem – Little difficult problem on backtracking.
Surprise aptitude test:
2 coding questions 60 mins.
Questions involved DSA and strongly based on optimising the code:
eg :- 1->2->3->4->5->NULL , k = 3
2. Search for an element in an array which has elements who’s values are first increasing and then decreasing. (Use modified binary search)
2 One-on-one Interview rounds, both technical.
Try giving THE most optimal algorithm which satisfies edge cases too.
I was told to write the code on the paper.
Questions asked to me were:
First interview round
2. Given a sorted array which can have repeated elements, find the occurrence of an element. (Most optimal solution is O(logn) – Using binary search to find start and end occurrence)
3. Make a data structure and implement an algorithm to print all the files in a directory. (the root directory can have sub-directories too.)
I used an n-ary tree and BFS to print files. It can also be done using Stack.
Second interview round
1. He asked some question about my CV
3. DFS of binary tree, n-ary tree.
4. Then he asked some question from other subjects.
OS – Scheduling
DBMS – Normalization, Transaction
OOPS – Abstraction
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