Amazon ml engineer Interview Questions and Answers

Q1. Data structure and algorithm
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Q2. Some tricky logical question
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Q3. Stack and queue
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Q4. Some basic question about system Design
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Hackerrank Coding Test, Leetcode medium questions

HLD test, was asked to design an online coding platform like leetcode

Q1. Most interesting project you have worked on
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Q2. How do you handle conflict at workplace
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Q1. Find the leaves of the tree.
Ans. 
Leaves of a tree are the nodes with no children in a tree data structure.
• Traverse the tree and identify nodes with no children.

• Use depth-first search or breadth-first search algorithms to find leaves.

• Examples: In a binary tree, leaves are nodes with no left or right child.

• In a general tree, leaves are nodes with no children in their child list.
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Q2. Find the LCA of tree.
Ans. 
The Lowest Common Ancestor (LCA) of a tree is the shared ancestor of two nodes farthest from the root.
• Start from the root and traverse the tree to find the paths from the root to the two nodes.

• Compare the paths to find the last common node between them, which is the LCA.

• If one of the nodes is an ancestor of the other, then the ancestor node is the LCA.
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Q1. What projects you worked upon?
Ans. 
I have worked on projects involving web development, mobile app development, and data analysis.
• Developed a web application using React and Node.js for a client in the e-commerce industry

• Created a mobile app using Flutter for a startup in the healthcare sector

• Performed data analysis on customer behavior using Python and SQL for a marketing company
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Q2. What internships you did?
Ans. 
I completed internships at ABC Company and XYZ Company during my undergraduate studies.
• Interned at ABC Company working on web development projects

• Interned at XYZ Company assisting with software testing and quality assurance

• Gained hands-on experience in coding, debugging, and problem-solving
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Some database questions,some java questions .

Q1. What is the difference between javascript and jQuery.
Ans. 
JavaScript is a programming language used for web development, while jQuery is a library built with JavaScript to simplify HTML document traversal and manipulation.
• JavaScript is a programming language, while jQuery is a library written in JavaScript.

• JavaScript can be used for a wide range of tasks, while jQuery is mainly used for DOM manipulation and event handling.

• JavaScript is a core technology for web development, w...read more
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Q2. Define different types of join
Ans. 
Different types of joins are used in SQL to combine rows from two or more tables based on a related column between them.
• Inner Join: Returns rows when there is at least one match in both tables.

• Left Join (or Left Outer Join): Returns all rows from the left table and the matched rows from the right table.

• Right Join (or Right Outer Join): Returns all rows from the right table and the matched rows from the left table.

• Full ...read more
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Q3. Define multithreading concept and exception handling.
Ans. 
Multithreading allows multiple threads to run concurrently, while exception handling deals with errors in a program.
• Multithreading involves running multiple threads simultaneously to improve performance and responsiveness.

• Threads share the same memory space but have their own program counter and registers.

• Exception handling is a mechanism to handle errors or exceptional situations in a program.

• It helps prevent the prog...read more
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Q1. Tell me about yourself
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React based
problem solving round

Q1. Given array of integer create subarray with sum = 0
Ans. 
Create subarrays with sum = 0 from given array of integers.
• Iterate through the array and keep track of the running sum.

• Store the running sum in a hashmap and check if the current sum - any previous sum equals 0.

• If yes, then the subarray between those two indices has a sum of 0.
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Q2. Left view of binary tree
Ans. 
The left view of a binary tree is the set of nodes visible when the tree is viewed from the left side.
• Traverse the tree in a level order manner and keep track of the first node at each level.

• Use a queue to store nodes at each level and update the left view nodes accordingly.

• Example: For a binary tree with root node 1, left child 2, and right child 3, the left view would be [1, 2].
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Q1. Career planning and further plan
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