Lenskart Senior Software Developer Interview Questions and Answers

Machine coding test with a duration of 2 hr. where they'll give one simple project to build.

MC question where they asked us to implement on our own system

Q1. Water trap problem
Ans. 
The water trap problem involves finding the minimum amount of water that can be trapped between blocks.
• Calculate the maximum height of blocks on left and right of each block.

• Find the minimum of the two heights and subtract the height of the current block to get trapped water.

• Sum up the trapped water for all blocks to get the total trapped water.
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It was a medium-level DSA round

This was also a DSA round

This again a DSA round

Q1. Can't disclose the question because of NDA signed but it was a design round
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Q1. This was a project discussion round
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Implement your own state management in React and integrate it into a React application.

Q1. Introduction about yourself and expectation
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Q1. IOS questions and architecture question about modularisation. From resume.
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Q2. Question Asked about memory management
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Q3. Question about modularisation and interface design
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Q1. Tell us about yourself? What you bring tp the table
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Q1. Find the index of greatest number from the array?
Ans. 
To find the index of the greatest number in an array.
• Loop through the array and compare each element with the current greatest number. If the current element is greater, update the greatest number and its index.

• Use built-in functions like Math.max() and indexOf() to simplify the code.
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Q2. Sql question find the top 3 employess who have max salary ?
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Q1. Tell me something about yorself?
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Q2. Why you want to join justdial?
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Round duration - 60 minutes
Round difficulty - Medium

This round was easy for me because this round only has Basic Math, OS, Programming and English Grammar questions.
There were also two easy coding problems.

Q1. 
Prime Numbers within a Range
Given an integer N, determine and print all the prime numbers between 2 and N, inclusive.
Input:
Integer N
Output:
Prime numbers printed on separate lines
Example:
Input...read more
Ans. 
Step 1 : Run a for loop from 2 to N
Step 2 : check each number if it is prime or not
Step 3 : if prime then print
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Q2. 
Form a Triangle Problem Statement
You are given an array of integers ARR with a length of N. Your task is to determine whether it's possible to construct at least one non-degenerate triangle using the val...read more
Ans. 
Step 1 : We will Iterate through the array and pivot each element as the first side of the triangle. Let’s say we are at ‘I’ th index, So we will pivot ‘I’th index as our first side of the triangle.
 
Step 2 : And for the second side of the triangle, we will start exploring from the next index of ‘I’ and pivot each element from (I+1) till the end as the second side of the triangle. Let’s say we are at the ‘J’th inde...read more
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Round duration - 45 minutes
Round difficulty - Medium

This was interview round where one indiamart senior lead engineer was interviewer. Initially I was nervous but interviewer was very gentle so I was very comfortable at the middle of interview. Interview was based on my resume and some basic problem solving questions.

Q1. 
Remove Character from String Task
Given a string str and a character X, your task is to create a function that removes all occurrences of X from the given string.
If the character X is not found in the s...read more
Ans. 
string remove_duplicate(string str) 
{
   	int v[256];
   	for (int i = 0; i < 256; i++) {
		v[i] = 0;
	}
	string ans = "";
	for (int i = 0; i < str.length(); i++) {
		int asc = int(str[i]);
		if (v[asc] == 0) {
			ans.push_back(str[i]);
			v[asc] = 1;
		}
	}
	return ans;
}
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