Nykaa Android Developer Interview Questions and Answers

Q1. Asked about my current work
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Round duration - 60 minutes
Round difficulty - Easy

Technical interview round. I was asked 2 DSA problems to discuss and code.

Q1. 
Binary Array Sorting Problem Statement
You are provided with a binary array, i.e., an array containing only 0s and 1s. Your task is to sort this binary array and return it after sorting.
Input:
 The fir...read more
Ans. 
A two-pointer approach can be used for this question. Maintain two indexes. Initialize the first index left as 0 and second index right as n-1, where n is size of the array .
While left < right , do the following : 
a) Keep incrementing index left while arr[left] =0 
b) Keep decrementing index right while arr[right]=1 
c) If left < right then exchange arr[left] and arr[right]
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Q2. 
Maximum Subarray Sum Problem Statement
Given an array arr of length N consisting of integers, find the sum of the subarray (including empty subarray) with the maximum sum among all subarrays.
Explanation...read more
Ans. 
The direct approach to solve this problem is to run two for loops and for every subarray check if it is the maximum sum possible. 
Time complexity: O(N^2), Where N is the size of the array.
Space complexity: O(1)
The efficient approach is to use Kadane's algorithm. It calculates the maximum sum subarray ending at a particular index by using the maximum sum subarray ending at the previous position. 
Steps : 
D...read more
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Round duration - 60 minutes
Round difficulty - Medium

Technical interview round. I was asked questions related to Android and its architecture.

Q1. How does RecyclerView work internally?
Ans. 
RecyclerView is a UI component which allows us to create a scrolling list. It is basically a new ViewGroup used to render any adapter-based view in horizontal/vertical /grid or staggered grid manner using the Viewholder pattern.

Working : So, let’s say when we are scrolling the list which has 50 items in the collection and we show only 5 items at once in the list. Here, item 1 to item 5 is the ones that are visible on t...read more
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Q2. Can you explain how to implement a ViewModel in Android?
Ans. 
There are three steps to setting up and using a ViewModel:
1. Separate out your data from your UI controller by creating a class that extends ViewModel
2. Set up communications between your ViewModel and your UI controller
3. Use your ViewModel in your UI controller
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Group discussion men's how is working and only one facing the problem i as the problem