Amazon Interview Questions, Process, and Tips

Q1. Check if array is monotonous
Ans. 
Check if array of strings is monotonous
• Iterate through the array and compare each string with the next one to check for monotonicity

• If all strings are in increasing or decreasing order, the array is monotonous

• Examples: ['apple', 'banana', 'cherry'] is monotonous, ['orange', 'kiwi', 'apple'] is not
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Q1. Group Anagrams Leetcode question
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Q1. Explain your previous experience
Ans. 
I have 5 years of experience as an Applications Engineer in the automotive industry.
• Designed and implemented software solutions for vehicle diagnostics

• Collaborated with cross-functional teams to troubleshoot and resolve technical issues

• Provided technical support to customers and conducted product demonstrations

• Developed training materials and conducted training sessions for internal teams

• Contributed to product developm...read more
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Good but tough i dint do well but still qualified

Very tough only graphs dp and linked lists were asked

Q1. Reverse a linked list
Ans. 
Reverse a singly linked list and return the reversed list.
• Iterate through the linked list and reverse the pointers

• Use three pointers to keep track of current, previous, and next nodes

• Update the head pointer to the last node after reversing
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Q2. Dfs of a graph
Ans. 
Depth-first search (DFS) is a graph traversal algorithm that explores as far as possible along each branch before backtracking.
• DFS starts at a selected node and explores as far as possible along each branch before backtracking.

• It uses a stack to keep track of nodes to visit next.

• DFS can be implemented recursively or iteratively.

• Example: DFS traversal of a graph starting from node A: A -> B -> D -> E -> C -&
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DSA medium level 2 question based on graph and recursion

Q1. DSA question on dynamic programming
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Q2. Question on graph (topological sort)
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Q1. Least Common Ancestor of binary tree
Ans. 
The least common ancestor of a binary tree is the node that is the lowest common ancestor of two given nodes in the tree.
• Start from the root node and recursively search for the given nodes in the left and right subtrees.

• If one node is found in the left subtree and the other in the right subtree, then the current node is the least common ancestor.

• If both nodes are found in the left subtree, then the least common ancesto...read more
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Q2. Smallest path to reach from a to b point in matrix
Ans. 
Use Dijkstra's algorithm to find the smallest path from point a to point b in a matrix.
• Implement Dijkstra's algorithm to find the shortest path in a matrix

• Create a matrix representation of the graph with weights on edges

• Start from point a and explore all possible paths to reach point b
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Q1. Write a query to get first order for every customer in the year 2021
Ans. 
Query to retrieve the first order for each customer in 2021
• Use a subquery to find the minimum order date for each customer in 2021

• Join the subquery with the main table on customer ID and order date to get the first order
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Q2. How do you connect S3 and Lambda
Ans. 
S3 and Lambda can be connected using S3 event notifications to trigger Lambda functions.
• Set up an S3 bucket and create a Lambda function

• Configure the S3 bucket to send event notifications to the Lambda function

• Define the event type and prefix/suffix for triggering the Lambda function

• Lambda function will be automatically triggered when the specified event occurs in the S3 bucket
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Q3. What is Churn Rate? What is customer conversion rate?
Ans. 
Churn rate is the percentage of customers who stop using a product or service over a certain period of time. Customer conversion rate is the percentage of potential customers who take a desired action, such as making a purchase.
• Churn rate measures customer retention and loyalty.

• Customer conversion rate measures the effectiveness of marketing and sales efforts.

• Churn rate can be calculated by dividing the number of custo...read more
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