Zomato IOS Software Developer Interview Questions and Answers

Medium question on hashmap

Q1. Design question which checks oops concept and data structure
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Q1. About Yourself in english
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Q2. Do you have experience
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Q3. How much salary your expecting
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Q1. About Yourself in english
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Q2. Do you have experience
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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

Q1. Coroutunes kotlin and structured concurrency
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Q2. Generics in kotlin and java interportability with kotlin
Ans. 
Generics in Kotlin and Java can be used interchangeably, but there are some differences in syntax and features.
• Kotlin supports declaration-site variance, while Java supports use-site variance.

• In Kotlin, you can use reified generics with inline functions, which is not possible in Java.

• Kotlin has nullable types by default, while in Java you need to use wildcards for similar behavior.
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Q1. Asked about my current work
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Q1. Lifecycle methods of activity
Ans. 
Lifecycle methods of activity are callback methods that allow you to manage the state of an activity throughout its lifecycle.
• onCreate() - called when the activity is first created

• onStart() - called when the activity is becoming visible to the user

• onResume() - called when the activity will start interacting with the user

• onPause() - called when the activity is going into the background, but is still visible

• onStop() - ca...read more
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Q2. What is inline function
Ans. 
An inline function is a function that is expanded in place at the point of call, rather than being called as a separate function.
• Inline functions are typically used for small, frequently called functions to reduce the overhead of function calls.

• They are defined with the 'inline' keyword in C++.

• Inline functions can improve performance by avoiding the overhead of function call stack operations.

• Example: inline int square(
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