Amazon Interview Experience for SDE-1 | 6-Months Internship (On-Campus)
Round 1 (Online Assessment): This was conducted on AMCAT. It had 4 sections (total 2.5 hrs)
- Code debugging section – 7 questions, C/C++/Java (20 minutes)
- Coding section – 2 questions (70 minutes)
- Workstyle assessment (20 minutes)
- Reasoning ability – 24 questions (35 minutes) – we could not skip and return to a question
38 students were selected for online interviews.
Round 2 (F2F Technical Interview): This was conducted on their own platform Amazon Chime (1 hr). First I had to give an introduction about myself. Then 2 coding questions were asked.
- Clone a binary tree with random pointer. I discussed the hashing approach, he then asked me to code it, then we discussed time complexity.
- Add all greater values to every node in a given BST. First I gave him brute force approach O(n^2), then a better approach O(nlogn), then reverse order traversal approach O(n).
Round 3 (F2F Technical Interview): Again a brief introduction about myself. Then 2 coding questions were asked (1 hr).
- Rotten oranges – Minimum time required to rot all oranges.
- Peripheral traversal of binary tree – Boundary Traversal of binary tree.
15 students got the offer for an internship, I was one of them.
- Even if you are not able to give the correct solution, try to build your solution considering all the cases given by the interviewer. I did the same in one question and it really helped.
- Amazon focuses only on DS Algo and its leadership principles.
- They ask questions mostly on Tree, Graph, DP, Stack (in the decreasing order of frequency)