Colruyt Group Solution Architect 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. MCQ questions on Aptitude as well as java.
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Q2. Tell me about yourself
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Q1. They asked from from your resume, and you must know java first and last requirements
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Normal Aptitude question

This was normal round of aptitude

Q1. - if else questions - python basics
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Q2. Logical questions
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Q3. Coding problem like coca cola
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Topic was based on COVID, time 30mins

Q1. Problems on arrays and strings
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Q1. Problems on arrays and strings
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Q2. Simple puzzles, which we can find on internet.
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Mostly asked Aptitude and coding questions

Topic was given Have to speak about that

Q1. Normal HashMap,Array,String related Question
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Q2. Sorting An array
Ans. 
Sorting an array of strings
• Use a sorting algorithm like quicksort or mergesort

• Consider the length of the strings for comparison

• Use a comparator function to define custom sorting criteria
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Q1. Logical Question and Array related Question
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Q2. HashMap,Linked List
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