Cohesity Senior Software Engineer Interview Questions and Answers

Q1. Write polyfill for array map
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Q1. Get minimum from stream. Query based.
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Q2. Minimum number of platforms for trains. Arrival n departure time is given.
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Q1. Design Instagram feed
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Designing Instagram feed involves displaying user's photos and videos in a visually appealing and user-friendly manner.
• Display user's posts in a grid layout with images/videos and captions

• Allow users to like, comment, and share posts

• Implement infinite scrolling to load more posts as user scrolls down

• Include a search bar to search for specific users or hashtags
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A code to identify errors and write Junit. Optimise the code as well.

Q1. Stacks using queue
Ans. 
Implementing a stack using two queues
• Use two queues to simulate a stack

• Push operation: Enqueue the element to queue 1

• Pop operation: Dequeue all elements from queue 1 to queue 2, dequeue the last element from queue 1, then swap the queues

• Top operation: Return the front element of queue 1

• Example: Push 1, 2, 3 - Queue 1: [1, 2, 3], Queue 2: []

• Example: Pop - Queue 1: [1, 2], Queue 2: [3]
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Q2. BFS and Knapsack problem, previous project experience
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Q1. Mimic Dataframe Merge
Ans. 
Implement a function to mimic the functionality of merging two DataFrames in Python.
• Create a function that takes two DataFrames as input.

• Merge the two DataFrames based on a common column or index.

• Handle different types of joins like inner, outer, left, and right joins.

• Return the merged DataFrame as output.
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Q2. Improve above case by case
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1 hour - Find longest palindromic substring

Q1. Design and code a zoo management system.
Ans. 
A zoo management system to track animals, enclosures, staff, and visitor information.
• Create classes for animals, enclosures, staff, and visitors

• Implement functions for adding, updating, and deleting records

• Include features for scheduling feeding times, cleaning enclosures, and managing staff shifts
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Standard DSA questions

Q1. Standard HR stuff.
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Q1. LRU Implementation
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LRU (Least Recently Used) is a cache eviction policy where the least recently accessed items are removed first.
• LRU cache stores key-value pairs with a maximum capacity.

• When a new key-value pair is added, if the cache is full, the least recently used item is removed.

• When a key is accessed, it is moved to the front of the cache to indicate it was recently used.
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Q2. Sell and buy stock
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Input output questions on C, C++ and java

Machine coding round 5-6 coding questions based on string and arrays. Medium level

Mini project : They ask to code a system with the given requirements