Accel IT Services System 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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Initially, they shortlist the candidates and group them into batches of 15 students. During this process, they conduct a group discussion (GD) in which each student has 3 minutes to think, followed by an opportunity to describe their points in 2 to 3 minutes.

Remote online test based on aptitude and programming snippets

Either group discussion round to check the communication

Q1. Are you ready to relocate?
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Q2. Why you wanna join coditas?
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This is a aptitude and coding round which is comparatively easy

They give you a topic for which you have to talk to for atleast 2 minutes

There are 2 GD rounds , idk why they take 2 GD rounds

Q1. This is the interview round one on one online
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Q2. Oops concepts, Sql - 3rd highest salary question, Dsa - reverse a string, DBMS concepts
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Q1. Java, OOPS, Flutter basics
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Q1. Isolates, Plugins, Event Loops
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