PwC Blockchain Developer Interview Questions, Process, and Tips

Round duration - 90 Minutes
Round difficulty - Medium

This round happened on the same day as JAM in the afternoon time. A slot of 20 minutes with respective timing was already sent to the selected students. Interview can’t be generalize as anything can happen over there and hence this was exclusively my experience. 
To have a quick judgement about the person, I believe nothing is better than throwing before him/her some puzzles (mathematical/ analytical/ programming problems) and see the approach. I received back-to-back 4 problems after a quick and brief introduction. The coding problems I got were way too easy (just basics: searching & mathematical). The harder part of this round was the puzzles (tricky, mathematical, related to probability). At last, I was asked a question on DBMS and the interviewer asked if I know JAVA.

Q1. 
Search an Element in a Sorted Array
Given a sorted array 'A' of 'N' integers, determine whether a number 'X' exists within this array for a series of queries. For each query, print 1 if 'X' exists in the ...read more
Ans. 
Search for a number in a sorted array and determine its existence for multiple queries.
• Use binary search algorithm to efficiently search for each query integer in the sorted array.

• For each query integer 'X', check if it exists in the array 'A' and output 1 if found, 0 otherwise.

• Ensure the array 'A' is sorted in non-decreasing order to apply binary search effectively.
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It was moderate one

Hard one

Aptitude topic was as generally appears in other placement tests , coding questions(not that much hard )

Q1. Asked for the introduction , then asked questions from the resume . Also the OOPS concept and interface
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Q1. Write a java program to sort an array
Ans. 
Java program to sort an array of strings
• Use Arrays.sort() method to sort the array of strings

• Import java.util.Arrays package

• Example: String[] arr = {"apple", "banana", "orange"}; Arrays.sort(arr);
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Q2. Collections in java and springboot

Ans. 

Collections in Java and Spring Boot are used to store and manipulate groups of objects.

• Collections in Java are used to store multiple objects in a single unit.

• Spring Boot provides support for managing collections through various data structures like List, Set, Map, etc.

• Collections in Java and Spring Boot help in organizing and manipulating data efficiently.

• Example: List names = new ArrayList<>();

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