Qualcomm Senior Java Developer Interview Questions and Answers

Round duration - 75 minutes
Round difficulty - Medium

This was an online coding round where I had 2 questions to solve under 75 minutes. Both the coding questions were of Medium to Hard level of difficulty.

Q1. 
Smallest Window Problem Statement
Given two strings, S and X, your task is to find the smallest substring in S that contains all the characters present in X.
Example:
Input:
S = "abdd"
X = "bd"
Output:
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Q2. 
K - Sum Path In A Binary Tree
Given a binary tree where each node contains an integer value, and a value 'K', your task is to find all the paths in the binary tree such that the sum of the node values in ...read more
Ans. 
Find all paths in a binary tree where the sum of node values equals a given value 'K'.
• Traverse the binary tree using DFS and keep track of the current path and its sum.

• At each node, check if the current sum equals 'K' and add the path to the result.

• Continue traversal to the left and right child nodes recursively.

• Return the list of paths that sum up to 'K'.
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Round duration - 60 Minutes
Round difficulty - Medium

This round had 2 questions of DS/Algo to solve under 60 minutes and 2 questions related to Operating Systems.

Q1. 
Validate Partial Binary Search Tree (BST) Problem Statement
You are provided with a binary tree containing 'N' nodes. Your task is to determine if this tree is a Partial Binary Search Tree (BST). Return t...read more
Ans. 
Validate if a binary tree is a Partial Binary Search Tree (BST) by checking if each node's left subtree contains nodes with data less than or equal to the node's data, and each node's right subtree contains nodes with data greater than or equal to the node's data.
• Check if each node's left subtree follows BST property (data <= node's data) and right subtree follows BST property (data >= node's data)

• Recursively che...read more
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Q2. 
Longest Increasing Subsequence Problem Statement
Given an array of integers with 'N' elements, determine the length of the longest subsequence where each element is greater than the previous element. This...read more
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Q3. Can you define process and threads in operating systems?
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Q4. What are the different types of semaphores?
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Round duration - 60 Minutes
Round difficulty - Hard

In this round, I was asked 3 coding questions out of which I had to implement the first two and for the last question I was only asked the optimal approach. The main challenge in this round was to implement the first two questions in a production ready manner without any bugs and so I had to spent some time thinking about some Edge Cases which were important with respect to the question.

Q1. 
Next Greater Element Problem Statement
You are given an array arr of length N. For each element in the array, find the next greater element (NGE) that appears to the right. If there is no such greater ele...read more
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Q2. 
Power Set Generation
Given a sorted array of 'N' integers, your task is to generate the power set for this array. Each subset of this power set should be individually sorted.
A power set of a set 'ARR' i...read more
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Q3. 
Counting Sort Problem Statement
Ninja is learning about sorting algorithms, specifically those that do not rely on comparisons. Can you help Ninja implement the counting sort algorithm?
Example:
Input:
...read more
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Hirepro , 2 easy to medium coding questions with technical questions

Q1. DSA questions were asked they were easy
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Q2. Insert a node at the middle of a linked list
Ans. 
To insert a node at the middle of a linked list, find the middle node and adjust pointers accordingly.
• Find the middle node using slow and fast pointers

• Adjust pointers to insert the new node at the middle
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Q1. Puzzle and general question
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Q1. Salary discussion
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Simple Python Coding questions.

Q1. Logical questions on Memory allocation.
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Round duration - 45 minutes
Round difficulty - Medium

Its a zoom call interview which lasted for 45 minutes. initially there are two panel members in which one is very targetting at me. They asked me different type of questions like jumping from DSA to project then to python then again java. Its a mixed combo pack type interview. for each and every question they asked me the real time example. The discussion on my project lasted for 15-20 mins.

Q1. 
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
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Round duration - 30 mins
Round difficulty - Easy

This round was a zoom interview. The interview started with my brief introduction. This time the interview was more interested in my hobbies and passions. He asked me what do you do to keep yourself updated with the latest technology trends?

Q1. Explain some of the projects in depth which you did in previous company?
Ans. 
Led a team to develop a scalable cloud-based application for real-time data analytics in the finance sector.
• Designed a microservices architecture to enhance scalability and maintainability.

• Implemented CI/CD pipelines using Jenkins and Docker for automated testing and deployment.

• Utilized AWS services like Lambda and S3 for serverless computing and data storage.

• Collaborated with cross-functional teams to gather requireme...read more
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Q2. Situational based questions, for checking problem solving skills as per job description and your resume
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Q1. Last Project details
Ans. 
Designed and implemented a cloud-based data analytics platform for real-time monitoring of network performance.
• Led a team of 5 engineers in developing the platform using AWS services such as EC2, S3, and Lambda functions

• Integrated data visualization tools like Tableau for generating reports and dashboards

• Implemented machine learning algorithms for predictive analysis of network outages

• Collaborated with stakeholders to ...read more
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Q2. SV -UVM questions
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