Vistaar Systems Software Engineer Interview Questions and Answers

Round duration - 40 minutes
Round difficulty - Medium

Asked about time complexity of algorithm, puzzles, DBMS, cutting edge technologies etc. What are indexes?

Q1. 
Flip Bits Problem Explanation
Given an array of integers ARR of size N, consisting of 0s and 1s, you need to select a sub-array and flip its bits. Your task is to return the maximum count of 1s that can b...read more
Ans. 
Given an array of 0s and 1s, find the maximum count of 1s by flipping a sub-array at most once.
• Iterate through the array and keep track of the maximum count of 1s obtained by flipping a sub-array.

• Consider flipping a sub-array from index i to j and calculate the count of 1s in the resulting array.

• Return the maximum count of 1s obtained by flipping a sub-array at most once.
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Round duration - 20 minutes
Round difficulty - Medium

Asked 1 standard algorithm

Q1. 
Number of Islands Problem Statement
You are provided with a 2-dimensional matrix having N rows and M columns, containing only 1s (land) and 0s (water). Your goal is to determine the number of islands in t...read more
Ans. 
Count the number of islands in a 2D matrix of 1s and 0s.
• Iterate through the matrix and perform depth-first search (DFS) to find connected 1s.

• Mark visited cells to avoid redundant traversal.

• Increment island count whenever a new island is encountered.
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Q1. Java Core concepts in detail Project details Data Structure and Algorithm Binary Search Program
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Q1. Java core concepts Spring boot concepts RDBS concepts Few basic coding questions
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Q1. Why are you leaving previous organisation? Can you work in hybrid culture? Project overview Salary and role discussion
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3 coding question
1. Easy and 2 medium
You can easily solve 2

Q1. 2 coding questions Climbing stairs and print repeating elements
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Q1. Dsa questions they asked me about linked list and stack
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Q2. They asked about circular linkedlist
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Basic array and string based questions.

Q1. Basics of OOPS and resume.
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Q2. Reverse a string without using new variable
Ans. 
Reverse a string without using new variable
• Use two pointers, one at the beginning and one at the end of the string

• Swap the characters at the two pointers and move the pointers towards each other until they meet in the middle
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Medium level dsa quen

Q1. MERN related quen
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Q2. Simple Dsa concepts and resume based and job profile based
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