Zscaler Softech Interview Questions, Process, and Tips

Round duration - 90 minutes
Round difficulty - Medium

Interviewer was cool, he started with basics of c and c++ and oops concept and extended to data structures .

Q1. 
Count Subsequences Problem Statement
Given an integer array ARR of size N, your task is to find the total number of subsequences in which all elements are equal.
Explanation:
A subsequence of an array i...read more
Ans. 
Count the total number of subsequences in which all elements are equal in an integer array.
• Iterate through the array and count the frequency of each element.

• Calculate the total number of subsequences for each element using the formula (frequency * (frequency + 1) / 2).

• Sum up the total number of subsequences for all elements to get the final result.
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Q2. 
Kevin's Stack Problem
Kevin requires assistance in reversing a string using the concept of a stack. Help Kevin by providing a solution that will reverse the string 'S' using a stack. The strings will only...read more
Ans. 
Reverse a string using a stack
• Create a stack to store characters of the input string

• Pop characters from the stack to reverse the string

• Reconstruct the reversed string from the popped characters
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Round duration - 30 minutes
Round difficulty - Easy

It was an easy round interviewer basically asked questions about family, goals and education background.