Vistaar Technologies Software Engineer Trainee Interview Questions, Process, and Tips

Basic quantitative questions along with DSA and coding questions were asked

Q1. Explain Greedy algorithms and Divide and Conquer techniques
Ans. 
Greedy algorithms make the optimal choice at each step, while Divide and Conquer breaks a problem into smaller subproblems.
• Greedy algorithms select the best option at each step without considering the overall solution

• Divide and Conquer divides a problem into smaller subproblems, solves them recursively, and then combines the solutions

• Example of Greedy algorithm: Dijkstra's shortest path algorithm

• Example of Divide and C
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Q2. Explain Joins, types of joins
Ans. 
Joins are used to combine rows from two or more tables based on a related column between them.
• Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• INNER JOIN returns rows when there is at least one match in both tables.

• LEFT JOIN returns all rows from the left table and the matched rows from the right table.

• RIGHT JOIN returns all rows from the right table and the matched rows from the left table.

• FULL ...read more
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Q3. Explain Multithreading
Ans. 
Multithreading is the ability of a CPU to execute multiple threads concurrently, allowing for improved performance and responsiveness in software applications.
• Multithreading allows multiple threads to run concurrently within a single process.

• Each thread has its own stack and program counter, but shares the same memory space.

• Multithreading can improve performance by utilizing multiple CPU cores efficiently.

• Examples of m...read more
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Q4. Explain deadlocks
Ans. 
Deadlocks occur when two or more processes are unable to proceed because each is waiting for the other to release a resource.
• Deadlocks happen when processes compete for resources and each holds a resource needed by the other.

• Four conditions must hold for a deadlock to occur: mutual exclusion, hold and wait, no preemption, and circular wait.

• Examples of resources that can lead to deadlocks include locks, semaphores, and ...read more
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Q5. Explain Binary search algorithm
Ans. 
Binary search is a divide and conquer algorithm that searches for a target value within a sorted array.
• Divide the array in half and compare the target value with the middle element

• If the target value is less than the middle element, search the left half of the array

• If the target value is greater than the middle element, search the right half of the array

• Repeat the process until the target value is found or the subarray
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Round 1 : Was a combination of aptitude + Basic but tricky Programming question

Aptitude was Divided into Three Section :
1) Mathematical Problems on Speed, Distance Time, Age Problems, Mensuration Problems
2)Logical Reasoning (situation based Problems)
3)Multiple Choice Questions on Data Structures (My Questions were Based on Binary Tree, operators, Basic Input output based Question

Then There Was Programming Section :
this section had 3 Programming Problem Statements
We have to Solve any 2.
Problem 1 was based on arrays
Problem 2 was based on strings
Problem 3 Was based on arrays
If You Solve Easy to Medium Intensity Questions On leetcode you can easily tackle these problems
Problem Were of easy intensity but had a tricky part.

Q1. Results Awaited : Will Share my Experience once i reach round 2
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