UBS Software Engineer Trainee Interview Questions and Answers

Q1. Public key Cryptography
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Question related to Aptitude

2 coding question both are simple

Q1. Introduction to youself, location?
Ans. 
I am a recent graduate with a degree in Computer Science from XYZ University. I am currently located in City, State.
• Recent graduate with a degree in Computer Science

• Currently located in City, State
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Q2. Write code of react for login page
Ans. 
Code for a login page in React
• Create a form component with input fields for username and password

• Handle form submission and validation

• Use state to store user input and handle login functionality
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Q3. Do u have any question for me
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I believe it was easy; they provided a total of 60 questions.

Two coding questions were provided: one was easy, and the other was hard.

Q1. Can you describe the coding scenario question you were given, and how it related to your resume?
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Q1. Please explain the Quick Sort algorithm and its process of reallocation.
Ans. 
Quick Sort is a popular sorting algorithm that uses divide and conquer strategy to sort elements in an array.
• Quick Sort picks a pivot element and partitions the array around the pivot.

• It recursively sorts the sub-arrays on either side of the pivot.

• The process continues until the entire array is sorted.

• Example: Given array [5, 2, 9, 3, 7], after Quick Sort it becomes [2, 3, 5, 7, 9].
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90min test, questions from oops, http, css, java, analtical ability

1 easy 1 med, 1 easy enuf to pass

General aptitude questions

Q1. Project discussion, detailed
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Q2. Coding question on strings
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Q1. Why this company, how do you handle conflict in team members. Which is your desired location, Pune or Hyderabad
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1 Reverse a link list
2. Simple mathematical Problem

Q1. SQl, ML, AI Questions including java
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Q2. SQL, ML, AI related questions including some core java questions
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Round duration - 90 minutes
Round difficulty - Medium

2 programming questions, MCQs based on OS, DBMS, OOPS and web fundamentals

Q1. Search In A 2D Matrix
You have been given a 2-D array 'MAT' of size M x N where 'M' and 'N' denote the number of rows and columns, respectively. The elements of each row are sorted ...read more
Ans. Brute Force
We have a brute force solution to this problem. We can simply traverse the matrix and check if ‘TARGET’ exists or not. 
Space Complexity: O(1)Explanation:
O(1)
 
Since, we are not using any extra space to find the number of pairs. Therefore, the overall space complexity will be O(1).
Time Complexity: O(m*n) - For 2d arraysExplanation:
O(M*N) where ‘M’ and ‘N’ denote the number of rows and columns in ‘M...read more
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Q2. Reverse Linked List
You are given a Singly Linked List of integers. You need to reverse the Linked List by changing the links between nodes.
Input Format :
The first line of input contains a single integ...read more
Ans. Recursive Approach
One way is to use recursion to reverse the list. Divide the linked list in two halves, the first node and the rest of the list. Reverse the second half using recursion and append the first half, that is the first node at the end of the reversed linked list. Return the head of the reversed linked list.
 
Algorithm
 
• If the list contains only one node, return the head of the list.
• Else, divide the ...read more
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Round duration - 40 minutes
Round difficulty - Easy

This round had 2 coding questions and some basic questions revolving around OOPs

Q1. Palindromic Linked List
You are given a singly Linked List of integers. Your task is to return true if the given singly linked list is a palindrome otherwise returns false.
For example:
The given linked ...read more
Ans. Using Stack
1. The idea is to traverse the Linked List from head to tail and push every encountered node data into the stack.
2. Then we traverse the Linked List and for each node, we pop the top element from the stack and compare it with current node data of the Linked List. If they mismatch then the current linked list is not palindrome else if all elements match then the linked list is a palindrome.
Space Complexity: O(n)Exp...read more
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Q2. Find the maximum level sum among all the levels in the Binary Tree
Given a Binary Tree with integer nodes, your task is to find the maximum level sum among all the levels in the Binary Tree. The sum of any...read more
Ans. Recursive Approach
Let’s traverse the given Binary tree using Recursion.The idea is to recursively store the sum of nodes of every level separately in a map.
 
• Take a map to store the sum of each level. 
• The recursive function has ‘ROOT’, current level, and map as its parameters.
  • Base Condition:  If ‘ROOT’ is NULL, return.
  • Add the value of the current node to the value mapped to the current level in the map.
  • Re...read more
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Q3. OOPS Question
How is an abstract class different from an interface?
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Q4. OOPS Question
What is the difference between overloading and overriding?
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Q5. OOPS Question
What is meant by static polymorphism?
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Round duration - 30 minutes
Round difficulty - Easy

Was conducted a couple of hours after the previous Tech round. The round was a HR one, behavioral questions and discussion around my hobbies :)