Cradlepoint Interview Questions and Answers

Round duration - 60 minutes
Round difficulty - Medium

Technical Interview round with questions based on DSA.

Q1. 
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:
"e...read more
Ans. 
Reverse a given string containing alphabets, numbers, and special characters.
• Iterate through the string from the end to the beginning and append each character to a new string.

• Use built-in functions like reverse() or StringBuilder in languages like Python or Java for efficient reversal.

• Handle special characters and numbers along with alphabets while reversing the string.

• Ensure to consider the constraints on the number ...read more
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Q2. 
Flip Bits Problem Explanation
Given an array of integers ARR of size N, consisting of 0s and 1s, you need to select a sub-array and flip its bits. Your task is to return the maximum count of 1s that can b...read more
Ans. 
Given an array of 0s and 1s, find the maximum count of 1s by flipping a sub-array at most once.
• Iterate through the array and keep track of the maximum count of 1s obtained by flipping a sub-array.

• Consider flipping a sub-array from index i to j by changing 0s to 1s and vice versa.

• Update the maximum count of 1s if the current count is greater.

• Return the maximum count of 1s obtained after flipping a sub-array at most once
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Q3. 
Check If Preorder Traversal Is Valid
Determine whether a given array ARR of positive integers is a valid Preorder Traversal of a Binary Search Tree (BST).
A binary search tree (BST) is a tree structure w...read more
Ans. 
Check if a given array of positive integers is a valid Preorder Traversal of a Binary Search Tree (BST).
• Create a function that takes the array as input and checks if it satisfies the properties of a BST preorder traversal.

• Iterate through the array and maintain a stack to keep track of the nodes in the BST.

• Compare each element with the top of the stack to ensure it follows the BST property.

• If the array is a valid preord...read more
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Q4. 
First and Last Position of an Element in a Sorted Array
Given a sorted array/list ARR consisting of ‘N’ elements, and an integer ‘K’, your task is to find the first and last occurrence of ‘K’ in ARR.
Exp...read more
Ans. 
Find the first and last occurrence of a given element in a sorted array.
• Use binary search to find the first occurrence of the element.

• Use binary search to find the last occurrence of the element.

• Handle cases where the element is not present in the array.
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Round duration - 60 minutes
Round difficulty - Medium

Technical round with questions based on DSA, OS, OOPS etc.

Q1. 
Intersection of Two Arrays Problem Statement
Given two arrays A and B with sizes N and M respectively, both sorted in non-decreasing order, determine their intersection.
The intersection of two arrays in...read more
Ans. 
The problem involves finding the intersection of two sorted arrays efficiently.
• Use two pointers to iterate through both arrays simultaneously.

• Compare elements at the pointers and move the pointers accordingly.

• Handle cases where elements are equal or not equal to find the intersection.

• Return the intersection as an array of common elements.
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Q2. 
Remove Duplicates From Unsorted Linked List Problem Statement
You are provided with a linked list consisting of N nodes. Your task is to remove duplicate nodes such that each element occurs only once in t...read more
Ans. 
Remove duplicates from an unsorted linked list while preserving the order of nodes.
• Iterate through the linked list while keeping track of seen elements using a hash set.

• If a duplicate element is encountered, skip it by adjusting the pointers.

• Ensure the order of nodes is preserved by only keeping the first occurrence of each element.
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Q3. What is the difference between paging and swapping in operating systems?
Ans. 
Paging is a memory management scheme that allows the operating system to store and retrieve data from secondary storage in fixed-size blocks, while swapping involves moving entire processes between main memory and disk.
• Paging involves dividing physical memory into fixed-size blocks called pages, while swapping involves moving entire processes between main memory and disk.

• Paging allows for more efficient use of physical...read more
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Q4. Can you provide an example of a deadlock in operating systems?
Ans. 
A deadlock in operating systems occurs when two or more processes are unable to proceed because each is waiting for the other to release a resource.
• Deadlock involves a circular wait, where each process is waiting for a resource held by another process in the cycle.

• Four necessary conditions for deadlock are mutual exclusion, hold and wait, no preemption, and circular wait.

• Example: Process A holds Resource 1 and waits fo...read more
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Round duration - 60 minutes
Round difficulty - Medium

Technical Interview round with questions on DSA, OOPS and Puzzles.

Q1. 
Segregate Odd-Even Problem Statement
In a wedding ceremony at NinjaLand, attendees are blindfolded. People from the bride’s side hold odd numbers, while people from the groom’s side hold even numbers. For...read more
Ans. 
Rearrange a linked list such that odd numbers appear before even numbers while preserving the order of appearance.
• Iterate through the linked list and maintain two separate lists for odd and even numbers.

• Merge the two lists while preserving the order of appearance.

• Ensure to handle edge cases like empty list or list with only odd or even numbers.
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Q2. 
Convert Sorted Array to BST Problem Statement
Given a sorted array of length N, your task is to construct a balanced binary search tree (BST) from the array. If multiple balanced BSTs are possible, you ca...read more
Ans. 
Construct a balanced binary search tree from a sorted array.
• Create a function that recursively constructs a balanced BST from a sorted array.

• Use the middle element of the array as the root of the BST.

• Recursively build the left and right subtrees using the elements to the left and right of the middle element.

• Ensure that the left and right subtrees are also balanced BSTs.

• Return 1 if the constructed tree is correct, other
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Q3. What is the difference between the MVC (Model-View-Controller) and MVT (Model-View-Template) design patterns?
Ans. 
MVC focuses on separating concerns of an application into three components, while MVT is a variation used in Django framework.
• MVC separates an application into Model (data), View (presentation), and Controller (logic) components.

• MVT is used in Django framework where Model represents data, View represents presentation, and Template represents logic.

• In MVC, the Controller handles user input and updates the Model and View...read more
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Round duration - 30 minutes
Round difficulty - Easy

HR round with typical behavioral problems.