Randstad Front end Developer Interview Questions and Answers

Q1. Abstract class and interface
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Q2. Oops concepts and
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Q1. SQL, Oracle PL SQL QUESTIONS
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Q2. DML DDL TRIGGER PROCEDURE ETC
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Aptitude and coding logis asked

Few coding questions and MCQ based

Q1. About project and last change request i did
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Q1. Asked about companies and experiences
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Round duration - 105 minutes
Round difficulty - Medium

There were 3 problems .
One was easy but the other two were of medium level.

Q1. 
Aggressive Cows Problem Statement
Given an array representing positions of stalls and an integer ‘K’ representing the number of aggressive cows, determine the largest minimum distance between any two cows ...read more
Ans. 
The problem requires assigning aggressive cows to stalls in a way that maximizes the minimum distance between any two cows.
• Sort the array of stall positions in ascending order.

• Use binary search to find the largest minimum distance between cows.

• Check if it is possible to assign cows with this minimum distance by iterating through the sorted array.

• If it is possible, update the maximum distance and continue binary search ...read more
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Q2. 
Shortest Path in an Unweighted Graph
The city of Ninjaland is represented as an unweighted graph with houses and roads. There are 'N' houses numbered 1 to 'N', connected by 'M' bidirectional roads. A road...read more
Ans. 
The problem is to find the shortest path between two houses in an unweighted graph.
• The graph represents the city of Ninjaland with houses connected by roads.

• The input consists of the number of test cases, number of houses and roads, starting and ending house, and the roads between houses.

• The output is a vector of nodes representing the shortest path from the starting house to the ending house.

• If there are multiple shor...read more
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Q3. 
Count Set Bits Problem Statement
Given a positive integer N, compute the total number of '1's in the binary representation of all numbers from 1 to N. Return this count modulo 1e9+7 because the result can...read more
Ans. 
The task is to count the total number of '1' in the binary representation of all numbers from 1 to N.
• Convert each number from 1 to N into its binary representation

• Count the number of '1' bits in each binary representation

• Sum up the counts of '1' bits for all numbers

• Return the sum modulo 1e9+7
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Round duration - 60 minutes
Round difficulty - Easy

The interviewer was very polite and straightforward. 
Firstly he introduced himself and then asked me to introduce myself and then he jumped to the coding problems.
After the coding problems, he asked some questions from the OS and DBMS.

Q1. 
Reverse Words in a String: Problem Statement
You are given a string of length N. Your task is to reverse the string word by word. The input may contain multiple spaces between words and may have leading o...read more
Ans. 
The task is to reverse the words in a given string, removing any leading or trailing spaces and replacing multiple spaces between words with a single space.
• Split the string into words using spaces as delimiters

• Reverse the order of the words

• Join the reversed words with a single space between them

• Remove any leading or trailing spaces
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Q2. 
Reverse Linked List in Groups of K
You are provided with a linked list containing 'N' nodes and an integer 'K'. The task is to reverse the linked list in groups of size K, which means reversing the nodes ...read more
Ans. 
The task is to reverse a linked list in groups of size K.
• Iterate through the linked list in groups of size K

• Reverse each group using a helper function

• Connect the reversed groups to form the final reversed linked list
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Round duration - 60 minutes
Round difficulty - Medium

The interviewer was very polite and straightforward, firstly he introduce himself and then ask me to introduce myself and then ask some ques on my projects and then he jumps to the coding problems.

Q1. 
Remove Consecutive Duplicates From String Problem Statement
Given a string STR consisting of both lower and upper case characters, your task is to remove consecutive duplicate characters from the string a...read more
Ans. 
The task is to remove consecutive duplicate characters from a given string and return the new string.
• Iterate through the characters of the string

• Compare each character with the next character

• If they are the same, skip the next character

• If they are different, add the current character to the new string

• Return the new string
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Q2. 
Maximum Path Sum in a Matrix
Given an N*M matrix filled with integer numbers, determine the maximum sum that can be obtained from a path starting from any cell in the first row to any cell in the last row...read more
Ans. 
The question asks to find the maximum sum that can be obtained from a path starting from any cell in the first row to any cell in the last row of a given matrix.
• Iterate through each cell in the first row and calculate the maximum sum path ending at that cell

• For each cell, calculate the maximum sum path ending at that cell by considering the three possible directions

• Store the maximum sum path ending at each cell in a se...read more
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Q1. My hobbies sales question
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Q2. Other questions and my hobbies
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Coding test
Ex program and math

Q1. Technical interview About Web dev technology
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Q2. Oops Web development concept Node. Js, react.js
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Q3. Oops question ex encapsulation etc
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Q4. What is props and state
Ans. 
Props are read-only data passed from parent to child components, while state is mutable data managed within a component.
• Props are used to pass data from parent to child components

• Props are read-only and cannot be modified by the child component

• State is mutable data managed within a component

• State can be updated using setState() method

• Example: props are used to pass a user's name to a child component, while state is use...read more
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Q5. What is virtual dom
Ans. 
Virtual DOM is a lightweight copy of the actual DOM that React uses to improve performance by minimizing direct manipulation of the actual DOM.
• Virtual DOM is a concept in React where a lightweight copy of the actual DOM is created and updated instead of directly manipulating the actual DOM.

• When changes are made to the virtual DOM, React compares it with the actual DOM and only updates the necessary parts, reducing the ...read more
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Q1. Self introduction
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Q2. Whats your Education
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Q3. 12th + 2year ITI + 6 year experience
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Q1. How to sale credit card? And explain
Ans. 
To sell a credit card, understand the customer's needs, highlight benefits, and offer incentives.
• Understand customer's financial needs and spending habits

• Highlight benefits such as rewards, cashback, and fraud protection

• Offer incentives such as sign-up bonuses or waived fees

• Provide clear and concise information about interest rates and fees

• Address any concerns or objections the customer may have
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