NetApp Interview Questions and Answers

0/1 Knapsack Problem

Q1. Given an array of integers and a target sum N, return true if there exists a subset whose sum equals N, otherwise return false.
Ans. 
Determine if a subset of integers in an array sums to a given target N using dynamic programming or recursion.
• Dynamic Programming: Use a 2D array to store results of subproblems, where dp[i][j] indicates if a sum j can be formed with the first i elements.

• Recursive Approach: Implement a recursive function that explores including or excluding each element to find the target sum.

• Example: For array [3, 34, 4, 12, 5, 2] and...read more
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Q2. Given a 2D grid of 0s and 1s, count the number of islands.
Ans. 
Count islands in a 2D grid of 0s and 1s, where 1s represent land and 0s represent water.
• An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically.

• Use Depth-First Search (DFS) or Breadth-First Search (BFS) to explore and mark visited land.

• Example grid: [[1,1,0,0],[0,1,0,0],[0,0,1,1],[0,0,0,0]] has 2 islands.

• Iterate through each cell; if a '1' is found, increment the island co...read more
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Q1. Given a binary tree root and an array of levels, return the nodes present at those specific levels.
Ans. 
Retrieve nodes from a binary tree at specified levels using a breadth-first search approach.
• Use a queue to perform a level-order traversal of the binary tree.

• Track the current level and add nodes to a result list when the level matches the specified levels.

• Example: For levels [0, 1], in a tree with root 1, return [1, [2, 3]].

• Ensure to handle cases where specified levels exceed the height of the tree.
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Q1. Tell me about your self
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Q2. What qualities should QA have
Ans. 
A QA engineer should possess analytical skills, attention to detail, communication abilities, and a strong understanding of testing methodologies.
• Analytical Skills: Ability to analyze requirements and identify potential issues early in the development process.

• Attention to Detail: Ensuring that every aspect of the application is tested thoroughly, catching even the smallest bugs.

• Communication Skills: Effectively communi...read more
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Q1. What is raid and exp
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Q2. How do you handle multiple deadlines
Ans. 
I prioritize tasks, communicate effectively, and use tools to manage deadlines efficiently.
• Prioritization: I assess tasks based on urgency and importance, focusing on high-impact projects first. For example, if a critical bug is found, I address it immediately.

• Time Management: I break down larger tasks into smaller, manageable parts and set mini-deadlines to ensure steady progress.

• Effective Communication: I keep stakeh...read more
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Q1. Behavioral questions
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Q2. Coding problem - reg frequency of numbers in an array
Ans. 
Count the frequency of numbers in an array of strings.
• Iterate through the array and use a hashmap to store the frequency of each number.

• If the number is already in the hashmap, increment its count. Otherwise, add it to the hashmap with a count of 1.

• Return the hashmap with the frequency of each number.
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Q1. What are joins and its type
Ans. 
Joins are SQL operations that combine rows from two or more tables based on related columns.
• INNER JOIN: Returns records with matching values in both tables. Example: SELECT * FROM A INNER JOIN B ON A.id = B.id;

• LEFT JOIN: Returns all records from the left table and matched records from the right table. Example: SELECT * FROM A LEFT JOIN B ON A.id = B.id;

• RIGHT JOIN: Returns all records from the right table and matched re...read more
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Q2. Tell me about Dax query
Ans. 
DAX (Data Analysis Expressions) is a formula language used in Power BI, Excel, and SQL Server for data modeling and analysis.
• DAX is used to create calculated columns, measures, and tables in Power BI.

• It includes functions for filtering, aggregating, and manipulating data.

• Example: A measure to calculate total sales could be defined as: Total Sales = SUM(Sales[Amount]).

• DAX supports time intelligence functions, allowing f...read more
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