UBS Interview Questions, Process, and Tips

Coding questions on sql python and spark

Q1. Hacker rank code pair
Ans. 
Implement a function to pair elements of an array based on a given sum.
• Iterate through the array and check if the current element plus any other element equals the given sum.

• Use a hash set to store elements already visited to avoid duplicate pairs.

• Return an array of arrays containing the pairs that sum up to the given value.
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Q2. Pyspark questions
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Q1. How Python data structures stored in memory
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Q2. Inheritance in Python
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Logical, Quants, Verbal and Coding

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Q1. Technical questions based on profile
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Q1. Difference between HashMap and ConcurentHashMap
Ans. 
HashMap is not thread-safe while ConcurrentHashMap is thread-safe.
• HashMap is not thread-safe and can cause ConcurrentModificationException if modified while iterating.

• ConcurrentHashMap allows concurrent modifications without causing any exception.

• ConcurrentHashMap achieves thread-safety by dividing the map into segments and locking only a portion of the map during updates.

• ConcurrentHashMap is suitable for high-concurre...read more
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Q2. Java 8 new features
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Java 8 introduced several new features including lambda expressions, streams, functional interfaces, and default methods.
• Lambda expressions allow you to write code in a more concise and readable way.

• Streams provide a way to work with sequences of elements and perform operations on them.

• Functional interfaces are interfaces with a single abstract method, which can be implemented using lambda expressions.

• Default methods a...read more
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Q1. AWS project related
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