Intel Senior Developer Interview Questions and Answers

Round duration - 30 minutes
Round difficulty - Easy

Q1. How do you search for a node in a linked list?
Ans. 
To search for a node in a linked list, iterate through the list and compare each node's value with the target value.
• Start at the head of the linked list

• Iterate through each node by following the 'next' pointer

• Compare the value of each node with the target value

• Return the node if found, otherwise return null
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Q2. How do you detect a loop in a linked list?
Ans. 
To detect a loop in a linked list, we can use Floyd's Cycle Detection Algorithm.
• Initialize two pointers, slow and fast, at the head of the linked list.

• Move slow pointer by one step and fast pointer by two steps.

• If there is a loop, the two pointers will eventually meet.

• Alternatively, we can use a hash set to store visited nodes and check for duplicates.
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Q3. Implement a stack using a singly linked list.
Ans. 
Implement a stack using a singly linked list
• Create a Node class with data and next pointer

• Create a Stack class with top pointer pointing to the top of the stack

• Implement push, pop, and peek operations by manipulating the linked list

• Example: Node class - Node { int data; Node next; }
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Round duration - 40 minutes
Round difficulty - Easy

Q1. What is the top view of a binary tree?
Ans. 
The top view of a binary tree shows the nodes visible from the top when looking down from the root node.
• The top view of a binary tree is the set of nodes visible from the top when looking down from the root node.

• Nodes at the same horizontal distance from the root are considered at the same level in the top view.

• If multiple nodes are at the same horizontal distance, only the topmost node at that level is included in the...read more
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Q2. Explain the process of deleting a node from a linked list, covering all possible cases.
Ans. 
Deleting a node from a linked list involves updating pointers to maintain the list's integrity.
• Identify the node to be deleted by traversing the list

• Update the previous node's next pointer to skip the node to be deleted

• Free the memory allocated to the node to be deleted
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Q1. What your exp?
Ans. 
I have over 5 years of experience in software development, specializing in web applications and cloud technologies.
• Developed a full-stack web application using React and Node.js, improving user engagement by 30%.

• Led a team of 4 developers in creating a microservices architecture for a scalable e-commerce platform.

• Implemented CI/CD pipelines using Jenkins and Docker, reducing deployment time by 50%.

• Worked with Agile met...read more
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Q2. What is you total exp?
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Round duration - 60 minutes
Round difficulty - Medium

This round had 2 coding problems and we had to code it on hackerearth only.
The use of Outside IDE was forbidden.
The timing of test was 12:00 PM to 1:00 PM.

Q1. 
Merge Overlapping Intervals Problem Statement
Given a specified number of intervals, where each interval is represented by two integers denoting its boundaries, the task is to merge all overlapping interv...read more
Ans. 
Merge overlapping intervals and return sorted list of merged intervals.
• Iterate through intervals and merge overlapping ones

• Sort merged intervals based on starting times

• Handle edge cases like empty input or single interval

• Use a data structure like list or array to store merged intervals
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Q2. 
Search In Rotated Sorted Array Problem Statement
Given a rotated sorted array ARR of size 'N' and an integer 'K', determine the index at which 'K' is present in the array.
Note:
1. If 'K' is not present...read more
Ans. 
Given a rotated sorted array, find the index of a given integer 'K'.
• Use binary search to find the pivot point where the array is rotated.

• Based on the pivot point, perform binary search on the appropriate half of the array to find 'K'.

• Handle cases where 'K' is not present in the array by returning -1.
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Round duration - 60 minutes
Round difficulty - Medium

This was an Online F2F Technical Round conducted on CodePair : Hackerearth. So, Basically You have to Run and Submit ( Pass All Test cases) in the Interview Round also (Like normal Coding Test) in Hackerearth & along with that You should have to explain your Code and Approach to the Interviewers.
The Interviewers were helpful and didn't hesitate in giving hints.
Timing - 11:00 A.M to 12:00 P.M

Q1. 
Minimum Fountains Activation Problem
In this problem, you have a one-dimensional garden of length 'N'. Each position from 0 to 'N' has a fountain that can provide water to the garden up to a certain range...read more
Ans. 
Find the minimum number of fountains to activate to water the entire garden.
• Iterate through the array to find the coverage of each fountain.

• Keep track of the farthest coverage reached by activating fountains.

• Activate the fountain that covers the farthest point not yet covered.

• Repeat until the entire garden is watered.
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Q2. 
Bellman Ford Shortest Path Problem
Given a directed weighted graph comprised of vertices labeled 1 to N and M edges, where each edge connects two nodes u and v with a weight w representing the distance be...read more
Ans. 
Bellman Ford algorithm is used to find the shortest path in a graph with negative weights.
• Initialize distances from source to all vertices as infinity, and distance to source as 0.

• Relax all edges V-1 times to find shortest path.

• If any distance is updated in Vth iteration, then there is a negative weight cycle.

• Return the distance to destination vertex after V-1 iterations.

• Example: For the given graph, shortest path from...read more
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Round duration - 30 minutes
Round difficulty - Easy

This was a Google Meet Video Call. The HR was friendly and asked basic questions.
The timing was 2:00 PM to 2:30 PM.

Q1. Question on merge sort
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