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WatchGuard Technologies Software Developer Interview Questions and Answers

Updated 15 Mar 2024

Q1. Distinct Elements in K-Sized Windows

The task is to determine the number of distinct elements in every sliding window of size 'K' across an array 'ARR' of size 'N'. A 'K' sized window is a contiguous sequence o...read more

Ans.

Calculate the count of distinct elements in each sliding window of size 'K' across an array 'ARR'.

  • Use a sliding window approach to iterate through the array and keep track of distinct elements using a hashmap or set.

  • Update the count of distinct elements in each window as it slides across the array.

  • Return the array detailing the count of distinct elements in each 'K' sized window for each test case.

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Q2. Reverse the String Problem Statement

You are given a string STR which contains alphabets, numbers, and special characters. Your task is to reverse the string.

Example:

Input:
STR = "abcde"
Output:
"edcba"

Input...read more

Ans.

Reverse a given string containing alphabets, numbers, and special characters.

  • Iterate through the string from end to start and append each character to a new string.

  • Alternatively, use built-in functions like reverse() or slicing to reverse the string.

  • Handle special characters and numbers while reversing the string.

  • Ensure to consider the constraints on the length of the string and number of test cases.

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Q3. Move Zeros to Left Problem Statement

Your task is to rearrange a given array ARR such that all zero elements appear at the beginning, followed by non-zero elements, while maintaining the relative order of non-z...read more

Ans.

Rearrange an array such that all zero elements appear at the beginning, followed by non-zero elements, maintaining relative order of non-zero elements.

  • Iterate through the array and maintain two pointers - one for the next position to place a zero and one for the next non-zero element.

  • Swap the elements at these pointers until all zeros are moved to the left and non-zero elements are in their relative order.

  • Time complexity: O(N), Space complexity: O(1)

  • Example: Input: [1, 1, 0, ...read more

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Q4. MergeSort Linked List Problem Statement

You are given a Singly Linked List of integers. Your task is to sort the list using the 'Merge Sort' algorithm.

Input:

The input consists of a single line containing the ...read more
Ans.

Sort a Singly Linked List using Merge Sort algorithm.

  • Implement the Merge Sort algorithm for linked lists.

  • Divide the list into two halves, sort each half recursively, and then merge them.

  • Use a fast and slow pointer to find the middle of the list for splitting.

  • Handle the base cases of empty list or single node list.

  • Example: Input: 4 3 2 1 -1, Output: 1 2 3 4

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Discover WatchGuard Technologies interview dos and don'ts from real experiences
Q5. Write an SQL query to find the second highest salary from a table.
Ans.

SQL query to find the second highest salary from a table

  • Use the MAX() function to find the highest salary

  • Use the NOT IN operator to exclude the highest salary from the results

  • Order the salaries in descending order and limit the result to 1

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Q6. 5 dsa array string

Ans.

Implement a data structure for storing and manipulating an array of strings.

  • Use a dynamic array to store the strings.

  • Implement functions for adding, removing, and accessing strings in the array.

  • Consider memory management and resizing the array as needed.

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