Paxcom India Software Engineer Trainee Interview Questions, Process, and Tips

Test was on Hackerrank, 150 min duration, questions were easy to medium difficulty from topics such as Binary search, Doubly Linked list and Array manipulation.

Q1. What is an Enum? implementation of an Enum
Ans. 
An Enum is a data type that consists of a set of named values.
• Enums are used to define a set of constants that can be used throughout the code.

• Each value in an Enum is assigned an integer value by default, starting from 0.

• Enums can also be assigned specific integer values or even string values.

• Enums can be used in switch statements to handle different cases.

• Example: enum Color { RED, GREEN, BLUE };

• Example: enum Status
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Q2. Most efficient way to reverse a String of characters
Ans. 
The most efficient way to reverse a String of characters is to use StringBuilder's reverse() method.
• Create a StringBuilder object with the given String as parameter

• Call the reverse() method on the StringBuilder object

• Convert the StringBuilder object back to a String using toString() method
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Q3. Find the odd occuring number from array of numbers including even occuring (frequency) numbers.
Ans. 
Find the odd occurring number from an array of numbers, including even occurring numbers.
• Iterate through the array and count the frequency of each number using a hash map.

• Iterate through the hash map and return the number with an odd frequency.

• If no number has an odd frequency, return 'No odd occurring number found.'
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Q4. Follow-up to Q3: Find two odd occuring numbers (Eff. Sol: Double Xor method)
Ans. 
The double XOR method is used to find two odd occurring numbers in an array.
• Iterate through the array and perform XOR operation on all elements

• The result will be the XOR of the two odd occurring numbers

• Find the rightmost set bit in the result

• Divide the array into two groups based on whether the corresponding bit is set or not

• Perform XOR on each group separately to find the two odd occurring numbers
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Q1. Why would you like to join our company?
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Q2. What are your career goals?
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