Zscaler Interview Questions

Zscaler Interview Questions

Showing 25 questions

Ranking

A question's ranking corresponds to how commonly it's asked by Zscaler. The higher the ranking, the more likely you'll encounter it in a Zscaler interview.

Question

Frequency

Difficulty

Apply Operations to Make Sum of Array Greater Than or Equal to k

You're given an array of numbers and a target value 'k'. You can apply specific operations to array elements to maximize the array's sum; determine the minimum number of operations needed to make the sum greater than or equal to k.

Greedy Algorithms

If you have a Zscaler interview, it's very likely that you will get this question

#1. Apply Operations to Make Sum of Array Greater Than or Equal to k

You're given an array of numbers and a target value 'k'. You can apply specific operations to array elements to maximize the array's sum; determine the minimum number of operations needed to make the sum greater than or equal to k.

Greedy Algorithms

This question is very likely to be asked in your Zscaler interview

Maximum Strong Pair XOR I

Find two numbers in an array that form a 'strong pair' (where one number is no more than twice the other). Maximize the XOR result of all possible strong pairs, and return that maximum value.

ArraysTwo PointersBit Manipulation

If you have a Zscaler interview, it's very likely that you will get this question

#2. Maximum Strong Pair XOR I

Find two numbers in an array that form a 'strong pair' (where one number is no more than twice the other). Maximize the XOR result of all possible strong pairs, and return that maximum value.

ArraysTwo PointersBit Manipulation

This question is very likely to be asked in your Zscaler interview

Largest Number After Digit Swaps by Parity

Rearrange the digits of a given number to form the largest possible number. You can only swap digits with the same parity (even or odd).

StringsGreedy Algorithms

If you have a Zscaler interview, it's very likely that you will get this question

#3. Largest Number After Digit Swaps by Parity

Rearrange the digits of a given number to form the largest possible number. You can only swap digits with the same parity (even or odd).

StringsGreedy Algorithms

This question is very likely to be asked in your Zscaler interview

Maximum Strong Pair XOR II

Given an array of integers, find the maximum XOR value of a pair of numbers that also satisfy the condition where the smaller number is at least half of the larger number.

ArraysTwo PointersBit ManipulationSliding WindowsTrees

Somewhat likely

If you have a Zscaler interview, you might get this question

#4. Maximum Strong Pair XOR II

Given an array of integers, find the maximum XOR value of a pair of numbers that also satisfy the condition where the smaller number is at least half of the larger number.

ArraysTwo PointersBit ManipulationSliding WindowsTrees

This question is somewhat likely to be asked in your Zscaler interview

Day of the Year

Given a date string, determine which day of the year it represents (e.g., January 1st is day 1). Calculate the day number accounting for leap years.

Somewhat likely

If you have a Zscaler interview, you might get this question

#5. Day of the Year

Given a date string, determine which day of the year it represents (e.g., January 1st is day 1). Calculate the day number accounting for leap years.

This question is somewhat likely to be asked in your Zscaler interview

Optimal Account Balancing

You are given a list of transactions between people. Determine the minimum number of transactions needed to settle all debts, such that everyone owes or is owed exactly zero.

ArraysRecursionGraphs

Somewhat likely

If you have a Zscaler interview, you might get this question

#6. Optimal Account Balancing

You are given a list of transactions between people. Determine the minimum number of transactions needed to settle all debts, such that everyone owes or is owed exactly zero.

ArraysRecursionGraphs

This question is somewhat likely to be asked in your Zscaler interview

Minimum Replacements to Sort the Array

You are given an array of integers. Determine the minimum number of operations needed to sort the array in non-decreasing order, where each operation involves replacing an element with one or more elements that sum to the original value.

ArraysGreedy Algorithms

Somewhat likely

If you have a Zscaler interview, you might get this question

#7. Minimum Replacements to Sort the Array

You are given an array of integers. Determine the minimum number of operations needed to sort the array in non-decreasing order, where each operation involves replacing an element with one or more elements that sum to the original value.

ArraysGreedy Algorithms

This question is somewhat likely to be asked in your Zscaler interview

You are given a square matrix representing an image. Rotate the image by 90 degrees clockwise in-place.

Somewhat likely

If you have a Zscaler interview, you might get this question

#8. Rotate Image

You are given a square matrix representing an image. Rotate the image by 90 degrees clockwise in-place.

This question is somewhat likely to be asked in your Zscaler interview

You are given an array where each element represents your maximum jump length at that position. Determine if you can reach the last index starting from the first index.

ArraysDynamic ProgrammingGreedy Algorithms

Somewhat likely

If you have a Zscaler interview, you might get this question

#9. Jump Game

You are given an array where each element represents your maximum jump length at that position. Determine if you can reach the last index starting from the first index.

ArraysDynamic ProgrammingGreedy Algorithms

This question is somewhat likely to be asked in your Zscaler interview

Find the Smallest Divisor Given a Threshold

Given an array of numbers and a threshold, find the smallest divisor that ensures the sum of the divisions (ceiling) is less than or equal to the threshold. You need to efficiently search for this divisor.

ArraysBinary Search

If you have a Zscaler interview, it's unlikely that you will get this question. Zscaler does ask it, but it's rare

#10. Find the Smallest Divisor Given a Threshold

Given an array of numbers and a threshold, find the smallest divisor that ensures the sum of the divisions (ceiling) is less than or equal to the threshold. You need to efficiently search for this divisor.

ArraysBinary Search

This question is not likely to be asked in your Zscaler interview

Longest Common Prefix

Find the longest string that is a prefix of all strings in a given array. If no common prefix exists, return an empty string.

If you have a Zscaler interview, it's unlikely that you will get this question. Zscaler does ask it, but it's rare

#11. Longest Common Prefix

Find the longest string that is a prefix of all strings in a given array. If no common prefix exists, return an empty string.

This question is not likely to be asked in your Zscaler interview

Search in Rotated Sorted Array

You're given a sorted array that has been rotated, and a target value. Find the index of the target value in the rotated array, or return -1 if it's not present.

ArraysBinary Search

If you have a Zscaler interview, it's unlikely that you will get this question. Zscaler does ask it, but it's rare

#12. Search in Rotated Sorted Array

You're given a sorted array that has been rotated, and a target value. Find the index of the target value in the rotated array, or return -1 if it's not present.

ArraysBinary Search

This question is not likely to be asked in your Zscaler interview

Moving Average from Data Stream

Design a data structure to calculate the moving average of a stream of numbers. The moving average is calculated over a sliding window of a specified size.

ArraysSliding Windows

If you have a Zscaler interview, it's unlikely that you will get this question. Zscaler does ask it, but it's rare

#13. Moving Average from Data Stream

Design a data structure to calculate the moving average of a stream of numbers. The moving average is calculated over a sliding window of a specified size.

ArraysSliding Windows

This question is not likely to be asked in your Zscaler interview

Design a data structure that acts as a Least Recently Used (LRU) cache. Implement methods to get and put key-value pairs, evicting the least recently used entry when the cache is full.

If you have a Zscaler interview, it's unlikely that you will get this question. Zscaler does ask it, but it's rare

#14. LRU Cache

Design a data structure that acts as a Least Recently Used (LRU) cache. Implement methods to get and put key-value pairs, evicting the least recently used entry when the cache is full.

This question is not likely to be asked in your Zscaler interview

Transform one word into another, one letter at a time, using only words from a given dictionary. Find the shortest sequence of words to reach the target.

If you have a Zscaler interview, it's unlikely that you will get this question. Zscaler does ask it, but it's rare

#15. Word Ladder

Transform one word into another, one letter at a time, using only words from a given dictionary. Find the shortest sequence of words to reach the target.

This question is not likely to be asked in your Zscaler interview

Degree of an Array

Find the smallest subarray within a given array that has the same degree as the entire array. The degree is defined as the highest frequency of any element.

If you have a Zscaler interview, it's unlikely that you will get this question. Zscaler does ask it, but it's rare

#16. Degree of an Array

Find the smallest subarray within a given array that has the same degree as the entire array. The degree is defined as the highest frequency of any element.

This question is not likely to be asked in your Zscaler interview

Robot Bounded In Circle

A robot follows a sequence of instructions (move and rotate). Determine if the robot ends up back at its starting point, or if it's trapped in a repeating circular path.

If you have a Zscaler interview, it's unlikely that you will get this question. Zscaler does ask it, but it's rare

#17. Robot Bounded In Circle

A robot follows a sequence of instructions (move and rotate). Determine if the robot ends up back at its starting point, or if it's trapped in a repeating circular path.

This question is not likely to be asked in your Zscaler interview

Number of Divisible Triplet Sums

Given an array of integers, determine how many triplets sum up to a multiple of a given number. Count the number of such divisible triplets.

If you have a Zscaler interview, it's unlikely that you will get this question. Zscaler does ask it, but it's rare

#18. Number of Divisible Triplet Sums

Given an array of integers, determine how many triplets sum up to a multiple of a given number. Count the number of such divisible triplets.

This question is not likely to be asked in your Zscaler interview

Minimum Increment to Make Array Unique

You're given an array of numbers. Find the minimum number of increments needed to make all the numbers in the array unique.

ArraysGreedy Algorithms

If you have a Zscaler interview, it's unlikely that you will get this question. Zscaler does ask it, but it's rare

#19. Minimum Increment to Make Array Unique

You're given an array of numbers. Find the minimum number of increments needed to make all the numbers in the array unique.

ArraysGreedy Algorithms

This question is not likely to be asked in your Zscaler interview

Longest Substring Without Repeating Characters

Find the length of the longest substring within a given string that contains no repeating characters. The substring must be contiguous.

StringsTwo PointersSliding Windows

If you have a Zscaler interview, it's unlikely that you will get this question. Zscaler does ask it, but it's rare

#20. Longest Substring Without Repeating Characters

Find the length of the longest substring within a given string that contains no repeating characters. The substring must be contiguous.

StringsTwo PointersSliding Windows

This question is not likely to be asked in your Zscaler interview

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