OneBanc Technologies IOS Developer Interview Questions and Answers

Dsa hard level problems

Q1. In the first one to one interview round I was asked to solve 2 easy-medium level problems
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Q1. Graph based question
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Q2. Sliding window question
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Q1. Sorting+ Min heap question
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Q2. Double linked list + sorting+ map
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Q1. Application security related questions
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Q2. How to create a perticular mobile screen
Ans. 
To create a particular mobile screen, you need to design the layout using Interface Builder or programmatically in Swift.
• Design the UI layout using Interface Builder in Xcode

• Add necessary UI elements like labels, buttons, text fields, etc.

• Customize the appearance using constraints, auto layout, and size classes

• Implement functionality using Swift code to handle user interactions and data processing
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Build a clone of Google Photos app

Leet code problem hard and some times medium questions

Android Assignment - Create an android project for a given scenario.

Q1. Questions related to Android & Kotlin
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Develop a Movie SDK that will utilize a provided API to retrieve movie details.

Round duration - 45 Minutes
Round difficulty - Easy

Q1. 
BST Iterator Problem Statement
You are tasked with creating a class named BSTIterator that acts as an iterator for the inorder traversal of a binary search tree. Implement the following functions:
1. BST...read more
Ans. 
Create a BSTIterator class for inorder traversal of a binary search tree.
• Implement a constructor that takes the root of the binary search tree and initializes the iterator.

• Implement next() function to return the next smallest element in the inorder traversal.

• Implement hasNext() function to check if there is a next element in the inorder traversal.

• Traverse the binary search tree in inorder to get the desired output.
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Q2. 
Integer to Roman Conversion
Given an integer N, convert it to its corresponding Roman numeral representation. Roman numerals comprise seven symbols: I, V, X, L, C, D, and M.
Example:
Input:
N = 2
Outp...read more
Ans. 
Convert an integer to its corresponding Roman numeral representation.
• Create a mapping of integer values to Roman numeral symbols.

• Iterate through the mapping in descending order of values and build the Roman numeral representation.

• Subtract the largest possible value from the integer at each step and append the corresponding Roman numeral symbol.

• Repeat until the integer becomes 0.
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Round duration - 45 Minutes
Round difficulty - Medium

Q1. 
Cube Sum Pairs Problem Statement
Given a positive integer N, find the number of ways to express N as a sum of cubes of two integers, A and B, such that:
N = A^3 + B^3
Ensure you adhere to the following c...read more
Ans. 
The problem involves finding the number of ways to express a given positive integer as a sum of cubes of two integers.
• Iterate through all possible values of A and B within the given constraints.

• Check if A^3 + B^3 equals the given N, increment the count if true.

• Handle the case where A = B separately to avoid counting duplicates.
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Q2. 
Colorful Knapsack Problem
You are given a set of 'N' stones, each with a specific weight and color. The goal is to fill a knapsack with exactly 'M' stones, choosing one stone of each color, so that the to...read more
Ans. 
The Colorful Knapsack Problem involves selecting one stone of each color to fill a knapsack with a given weight capacity, minimizing unused capacity.
• Iterate through the stones and keep track of the minimum weight for each color.

• Use dynamic programming to find the optimal solution by considering all possible combinations.

• Handle cases where the knapsack cannot be filled under the given conditions by returning -1.

• In the g...read more
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Round duration - 15 Minutes
Round difficulty - Easy

Q1. Data structures and kotlin basics to advance
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