Travclan Technology India Software Development Engineer 1 Interview Questions and Answers

Round duration - 90 mins
Round difficulty - Hard

There were questions related to DP and DFS.

 

Q1. 
Trapping Rain Water Problem Statement
You are given a long type array/list ARR of size N, representing an elevation map. The value ARR[i] denotes the elevation of the ith bar. Your task is to determine th...read more
Ans. 
Calculate the total amount of rainwater that can be trapped between given elevations in an array.
• Iterate through the array and calculate the maximum height on the left and right of each bar.

• Calculate the amount of water that can be trapped at each bar by taking the minimum of the maximum heights on the left and right.

• Sum up the trapped water at each bar to get the total trapped water for the entire array.
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Round duration - 60 mins
Round difficulty - Medium

At first, I was asked about the different projects that I have done so far. We had a detailed discussion on the same.
He also checked my OOP concepts

Q1. Can you describe the process of designing an LRU Cache from scratch during your System Design Round?
Ans. 
Designing an LRU Cache involves implementing a data structure that stores a fixed number of items and removes the least recently used item when full.
• Start by defining the data structure for the cache, typically using a combination of a hashmap and a doubly linked list.

• Implement methods for getting and setting key-value pairs in the cache.

• When a new item is added to the cache, check if it exceeds the maximum capacity. I...read more
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Q2. 
Reverse Linked List Problem Statement
Given a Singly Linked List of integers, your task is to reverse the Linked List by altering the links between the nodes.
Input:
The first line of input is an intege...read more
Ans. 
Reverse a singly linked list by altering the links between nodes.
• Iterate through the linked list and reverse the links between nodes

• Use three pointers to keep track of the current, previous, and next nodes

• Update the links between nodes to reverse the list

• Return the head of the reversed linked list
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Q3. 
Middle of a Linked List
You are given the head node of a singly linked list. Your task is to return a pointer pointing to the middle of the linked list.
If there is an odd number of elements, return the ...read more
Ans. 
Return the middle element of a singly linked list, or the one farther from the head if there are even elements.
• Traverse the linked list with two pointers, one moving twice as fast as the other

• When the fast pointer reaches the end, the slow pointer will be at the middle

• If there are even elements, return the one that is farther from the head node

• Handle edge cases like linked list of size 1 or empty list
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Round duration - 60 mins
Round difficulty - Medium

It is HR + Technical round
asked about the Behavioural questions and how you justify yourself in an argument .questions related to current technology.
They gave me feedback on how well I had performed so far and gave me suggestions on what more can I do to further improve myself.

Blood relation, coding and decoding, number system , percentage

Q1. LLD HLD HM rounds
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Scraper a website and test with test cases

2 Questions based on DS and Algo basic problem solving.

Q1. How many times a boat has to make rounds to travel a number of people from one to another.
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Q1. Types of DS and a real life scenario.
Ans. 
Types of DS and a real life scenario
• Arrays - storing a list of names

• Linked Lists - managing a playlist

• Stacks - undo/redo functionality in text editors

• Queues - managing customer requests in a call center

• Trees - organizing files in a computer

• Graphs - social network connections
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Q1. Salary DIscussion on what is current and expected.
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Round duration - 60 minutes
Round difficulty - Easy

2 DSA problems to be solved in 60 min time limit.

Q1. 
Next Greater Element Problem Statement
Given a list of integers of size N, your task is to determine the Next Greater Element (NGE) for every element. The Next Greater Element for an element X is the firs...read more
Ans. 
Given a list of integers, find the next greater element for each element in the list.
• Iterate through the list from right to left and use a stack to keep track of elements.

• Pop elements from the stack until a greater element is found or the stack is empty.

• Store the next greater element for each element in a result array.

• If no greater element is found, store -1 in the result array.
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Q2. 
Floor Value of X Problem Statement
Given a sorted array A and an integer X, your task is to find and return the floor value of X in the array.
The floor value of X is the largest element in array A which...read more
Ans. 
Find the largest element in a sorted array smaller than or equal to a given integer X.
• Use binary search to efficiently find the floor value of X in the sorted array.

• Compare the middle element of the array with X and adjust the search accordingly.

• Return the element before or equal to X as the floor value, or -1 if no such element exists.
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Round duration - 60 minutes
Round difficulty - Medium

Face to Face round with interviewer.

Q1. 
Longest Common Subsequence Problem Statement
Given two strings STR1 and STR2, determine the length of their longest common subsequence.
A subsequence is a sequence that can be derived from another sequen...read more
Ans. 
The task is to find the length of the longest common subsequence between two given strings.
• Implement a function to find the longest common subsequence between two strings.

• Use dynamic programming to solve this problem efficiently.

• Iterate through the strings and build a matrix to store the lengths of common subsequences.

• The value in the bottom-right corner of the matrix will be the length of the longest common subsequenc
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Q2. 
Maximum Subarray Sum Problem Statement
Given an array of integers, determine the maximum possible sum of any contiguous subarray within the array.
Example:
Input:
array = [34, -50, 42, 14, -5, 86]
Out...read more
Ans. 
Find the maximum sum of any contiguous subarray within an array of integers.
• Iterate through the array and keep track of the maximum sum of subarrays encountered so far.

• At each index, decide whether to include the current element in the subarray or start a new subarray.

• Update the maximum sum if a new maximum is found.

• Example: For array [34, -50, 42, 14, -5, 86], the maximum subarray sum is 137.
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Round duration - 60 minutes
Round difficulty - Medium

Face to Face DSA round.

Q1. 
Delete Middle Node Problem Statement
You are given a singly linked list of integers. The task is to delete the middle node of this list.
Note:
1. If the list has no middle node, return an empty list (NU...read more
Ans. 
Delete the middle node of a singly linked list in O(N) time complexity and O(1) space complexity.
• Identify the middle node using slow and fast pointers technique.

• Update the pointers to skip the middle node.

• Handle edge cases like no middle node or two middle nodes.

• Perform the deletion in a single traversal of the linked list.

• Return the modified linked list after deletion.
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Q2. 
Group Anagrams Together
Given an array/list of strings STR_LIST, group the anagrams together and return each group as a list of strings. Each group must contain strings that are anagrams of each other.
E...read more
Ans. 
Group anagrams together in a list of strings.
• Iterate through the list of strings and sort each string to group anagrams together.

• Use a hashmap to store the sorted string as key and the original string as value.

• Return the values of the hashmap as the grouped anagrams.
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Round duration - 60 minutes
Round difficulty - Easy

This round was with VP (technology). 
1. One DSA problem.
2. Had a discussion on the projects mentioned in CV.
3. Theory Ques from DBMS, OS.

Q1. 
Job Sequencing Problem Statement
You are provided with a N x 2 2-D array called Jobs consisting of N jobs. In this array, Jobs[i][0] represents the deadline of the i-th job, while Jobs[i][1] indicates the...read more
Ans. 
Maximize profit by scheduling jobs within their deadlines.
• Sort the jobs array in descending order of profits.

• Iterate through the sorted array and schedule jobs based on deadlines.

• Keep track of completed jobs and their profits to calculate the total profit.

• Return the maximum profit achieved by scheduling jobs within deadlines.
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