Spinny SDE-2 Interview Questions and Answers

Round duration - 60 Minutes
Round difficulty - Medium

Timing was around 11 am
Environment was great, it intrigued me to join Blinkit.

Q1. 
Pair Sum Problem Statement
You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to find and return a list of all pairs of elements where each sum of a pair equals 'S'.
Note:
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Ans. 
Find pairs of elements in an array that sum up to a given value, sorted in a specific order.
• Sort the array in non-decreasing order.

• Use two pointers approach to find pairs with sum equal to 'S'.

• Return pairs in sorted order based on first value, with smaller second value coming first.
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Round duration - 60 Minutes
Round difficulty - Medium

Timing 11 am
Interviewer had good knowledge

Q1. Can you explain the activity lifecycle in Android development?
Ans. 
Activity lifecycle in Android development involves various states like onCreate, onStart, onResume, onPause, onStop, onDestroy.
• Activity is created with onCreate() method

• Activity becomes visible with onStart() and onResume() methods

• Activity goes into background with onPause() method

• Activity is stopped with onStop() method

• Activity is destroyed with onDestroy() method
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Q2. Can you explain the fragment lifecycle in Android development?
Ans. 
Fragment lifecycle in Android involves various states like created, started, resumed, paused, stopped, and destroyed.
• Fragments are created using the onCreateView() method.

• Fragments go through states like created, started, resumed, paused, stopped, and destroyed based on user interactions and system events.

• Fragment lifecycle methods include onCreate(), onStart(), onResume(), onPause(), onStop(), and onDestroy().
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Q3. Can you explain the MVVM pattern?
Ans. 
MVVM is a design pattern that separates the user interface from the business logic and data model.
• MVVM stands for Model-View-ViewModel

• Model represents the data and business logic

• View represents the UI components

• ViewModel acts as an intermediary between the Model and View, handling user input and updating the Model

• MVVM promotes separation of concerns and easier unit testing
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Round duration - 30 Minutes
Round difficulty - Easy

This round is cultural fit round

Round duration - 60 minutes
Round difficulty - Medium

- It was a face to face (virtually) round.
- Two questions one after one and you are expected to pass all the test cases.
- Question was Easy and Medium Easy. (tags: stack, array, bfs, dfs, array)

- Timing: Afternoon
- Interviewer: he was nice, as I was able to solve both question, he was very happy, and given me the feedback.

Q1. 
Remove Consecutive Duplicates from String
Given a string STR consisting of both lower and upper case characters, your task is to remove consecutive duplicate characters and return the newly formed string.
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Ans. 
The task is to remove consecutive duplicate characters from a given string and return the new string.
• Iterate through the characters of the string

• Compare each character with the next character

• If they are the same, skip the next character

• If they are different, append the current character to the new string
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Q2. 
Number of Islands Problem Statement
You are provided with a 2-dimensional matrix having N rows and M columns, containing only 1s (land) and 0s (water). Your goal is to determine the number of islands in t...read more
Ans. 
The task is to find the number of islands present in a 2-dimensional array filled with ones and zeroes.
• Iterate through each cell in the array

• If the cell is land (1) and not visited, perform a depth-first search to find all connected land cells

• Increment the count of islands for each connected component found
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Round duration - 135 minutes
Round difficulty - Medium

Machine Coding.

Timing: Afternoon
The interviewer was answering my questions nicely.

Round duration - 60 minutes
Round difficulty - Medium

Hiring Manager.
Interviewer: Sr Engineering Manager.
Timing: evening.

The environment was cool.

Q1. Data Structures and Algorithms
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Q1. Machine Coding round
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