Westin Software Engineer Interview Questions and Answers

It was 1 hour long and was asked to pass all the test cases.

Q1. System Design with basic of OOP and OS
Add your answer

Dsa -> questions on trees, linked list, stack, dynamic programming

Leetcode medium to hard

Q1. Rain water trapping
Add your answer
Q2. Bricks and ladder
Add your answer

Polyfills,html,css basics,js intermediate level

Coding Rond consisted of 3 questions

Q1. 1. Data structures and algorithms
Add your answer
Q2. 2. Computer fundamentals
Add your answer
Q3. Revise all cs fundamentals
Add your answer

3 data structure problem with medium to hard level leetcode type.

Q1. 1st question was on vertical order traversal in a tree. it was from gfg he also told me to optimise it
Add your answer
Q2. 2nd question was from leetcode ie meeting rooms ll , medium question
Add your answer

Round duration - 90 minutes
Round difficulty - Medium

Coding question of medium level difficulty, from DP. 
18 MCQs were core CSE related concepts e.g: OS, OOPs, DBMS, Networking
Time was 90 minutes.

Q1. 
Minimum Cost to Destination
You are given an NxM matrix consisting of '0's and '1's. A '1' signifies that the cell is accessible, whereas a '0' indicates that the cell is blocked. Your task is to compute ...read more
Ans. 
Find the minimum cost to reach a destination in a matrix with blocked cells.
• Use Breadth First Search (BFS) algorithm to explore all possible paths from the starting point to the destination.

• Keep track of the cost incurred at each cell and update it as you move through the matrix.

• Return the minimum cost to reach the destination or -1 if it is unreachable.
Answered by AI
Add your answer

Round duration - 30 minutes
Round difficulty - Medium

It was an one-to-one interview. It checks your problem solving ability and a few OOPs, OS, DBMS etc concepts. Coding questions were related to array, queue and DP.

Q1. 
Triangle Formation Using Array Elements
Given an integer array/list ARR of length 'N', determine if it is possible to form at least one non-degenerate triangle using the values of the array as the sides o...read more
Ans. 
Determine if it is possible to form a non-degenerate triangle using array elements as sides.
• Check if the sum of any two sides is greater than the third side for all combinations of sides.

• If the above condition is met for any combination, return true; otherwise, return false.
Answered by AI
Add your answer
Q2. 
Maximum Sum of Non-Adjacent Elements
You are given an array/list of integers. The task is to return the maximum sum of a subsequence such that no two elements in the subsequence are adjacent in the given ...read more
Ans. 
Find the maximum sum of non-adjacent elements in an array.
• Use dynamic programming to keep track of the maximum sum at each index, considering whether to include the current element or not.

• At each index, the maximum sum can be either the sum excluding the current element or the sum including the current element but excluding the previous element.

• Iterate through the array and update the maximum sum accordingly.

• Example: F...read more
Answered by AI
Add your answer

Round duration - 45 minutes
Round difficulty - Easy

It was also a problem solving round. However after coding questions, they also asked CSE conceptual questions.

Q1. 
Sum Tree Conversion
Convert a given binary tree into its sum tree. In a sum tree, every node's value is replaced with the sum of its immediate children's values. Leaf nodes are set to 0. Finally, return th...read more
Ans. 
Convert a binary tree into a sum tree by replacing each node's value with the sum of its children's values. Return preorder traversal.
• Traverse the tree in a bottom-up manner, starting from the leaf nodes.

• For each node, update its value to the sum of its children's values.

• Set leaf nodes to 0.

• Return the preorder traversal of the modified tree.
Answered by AI
Add your answer
Q2. What are the core concepts of indexing in Database Management Systems (DBMS)?
Ans. 
Core concepts of indexing in DBMS include types of indexes, benefits of indexing, and factors affecting index performance.
• Types of indexes: B-tree, Hash, Bitmap, etc.

• Benefits of indexing: Faster data retrieval, improved query performance, reduced disk I/O.

• Factors affecting index performance: Selectivity, clustering factor, index fragmentation.

• Examples: Creating an index on a column in a table to speed up search queries
Answered by AI
Add your answer

The assignment involved a train booking API. I needed to implement a feature that verified whether a train had sufficient available seats before confirming a booking, which would also resolve several failing tests. I was required to explain my thought process and describe the implementation as I progressed. Upon completion, with some extra time available, I proposed and implemented an improved solution: a new method that checks if a train has enough seats for a prospective booking while ensuring that families or groups who wish to stay together are not separated.