Infinx Associate Technical Engineer Interview Questions and Answers

A generic swap function swaps two values of any data type.

• The function should take two parameters of any data type.

• Use a temporary variable to store the value of one parameter.

• Assign the value of the second parameter to the first parameter.

• Assign the value of the temporary variable to the second parameter.

Search for an element in a rotated sorted linked list.

• Find the pivot point where the list is rotated.

• Divide the list into two sublists based on the pivot point.

• Perform binary search on the appropriate sublist.

• Handle edge cases such as empty list and list with only one element.

Search an element in a rotated sorted array

• Find the pivot point where the array is rotated

• Divide the array into two sub-arrays based on pivot point

• Perform binary search on the appropriate sub-array

• Repeat until element is found or sub-array size is 1

Find 5 missing numbers in an array of size 95 containing numbers in range 1 to 100.

• Create a boolean array of size 100 and mark the present numbers

• Iterate through the boolean array and find the missing numbers

• Alternatively, use a HashSet to store the present numbers and find the missing ones

Given a Sudoku board, find possible numbers for an empty cell.

• Iterate through empty cells and check possible numbers using row, column, and box constraints.

• Use a set to keep track of possible numbers for each empty cell.

• Return the set of possible numbers for the given empty cell.

Find integer average of 4 unsigned integers without typecasting

• Add all the integers and divide by 4

• Use bit shifting to divide by 4

• Handle overflow by using long long data type

• Use unsigned int data type for input

Code to identify 32 bit or 64 bit architecture of a processor

• Check if the operating system is 32 bit or 64 bit

• If OS is 32 bit, processor is 32 bit

• If OS is 64 bit, check if processor supports 64 bit architecture

• Use CPUID instruction to check if processor supports 64 bit architecture

Convert binary number to base 64 integer

• Divide the binary number into groups of 6 bits

• Convert each group of 6 bits to decimal

• Map the decimal value to the corresponding base 64 character

• Concatenate the base 64 characters to form the final integer

AngularJS is a JavaScript framework for building dynamic web applications.

• AngularJS is a client-side MVC framework.

• It allows developers to build single-page applications.

• It extends HTML with new attributes and tags.

• AngularJS uses two-way data binding to automatically synchronize data between the model and the view.

• It provides dependency injection and modularization features.

• Some popular examples of websites built with

A directive is a programming construct that provides instructions to a compiler or interpreter.

• Directives are used to control the behavior of a program or to provide additional information to the compiler or interpreter.

• They are typically written as special comments or statements in the code.

• Examples of directives include #include in C/C++ to include header files, #pragma to control compiler-specific behavior, and #def

A factory is a design pattern that provides an interface for creating objects of a certain class.

• A factory encapsulates the object creation logic and hides it from the client.

• It allows the client to create objects without knowing the specific class or implementation details.

• Factories can be used to create different types of objects based on certain conditions or parameters.

• They promote loose coupling and flexibility in...read more

Services are software components that perform specific tasks or provide functionality to other software applications.

• Services are self-contained and independent modules that can be accessed by other software components.

• They can be used to handle business logic, data processing, communication with external systems, etc.

• Examples of services include web services, microservices, RESTful APIs, and cloud services.

• Services ca...read more

A factory is responsible for creating and managing objects, while a service is responsible for providing specific functionality or performing tasks.

• A factory is used to create and initialize objects, often based on certain parameters or configurations.

• A service is a component that provides specific functionality or performs tasks for other components or systems.

• Factories are commonly used in object-oriented programming...read more

A program to sort an array of strings.

• Use a sorting algorithm like bubble sort, insertion sort, or quicksort.

• Compare strings using a comparison function.

• Implement the sorting algorithm in a function that takes the array as input and modifies it in place.

This program displays words separated by spaces.

• Use an array of strings to store the words.

• Iterate through the array and print each word followed by a space.

• Exclude the space after the last word.

A provider is a software component or service that supplies data, functionality, or resources to other software applications.

• A provider is responsible for delivering data, services, or resources to other software components or applications.

• Providers can be APIs, libraries, frameworks, or any other software component that offers functionality to other software.

• Examples of providers include database management systems, c

The $watch and $digest are two important concepts in AngularJS for data binding and updating the view.

• $watch is a function in AngularJS that allows you to watch for changes in a specific variable or expression.

• $digest is a function in AngularJS that triggers a process called the digest cycle, which updates the bindings and synchronizes the model and view.

• The $watch function takes two parameters: the variable or express...read more

ng-repeat is a directive in AngularJS used to repeat HTML elements for each item in an array.

• ng-repeat is used to create a loop in AngularJS

• It is commonly used to display a list of items from an array

• The directive is placed on an HTML element and uses the 'item in array' syntax

• It can also be used with filters and sorting

• Example:

• {{ item }}

ng-getValue is not a standard attribute in Angular. It may be a custom directive or a typo.

• Check if ng-getValue is a custom directive or attribute in your Angular application

• Verify if it is being used correctly in the HTML template

• If it is a typo, correct it to the appropriate attribute or directive

Developing CSS without using bootstrap involves writing custom CSS code to style web pages.

• Write CSS code to define styles for HTML elements

• Use CSS selectors to target specific elements

• Apply CSS properties to modify the appearance of elements

• Create media queries for responsive design

• Implement CSS animations and transitions

• Optimize CSS code for performance

CDN stands for Content Delivery Network. It is a distributed network of servers that deliver web content to users based on their geographic location.

• CDN improves website performance by reducing latency and increasing page load speed.

• CDN caches content in multiple locations, allowing users to access it from a server closest to them.

• CDN can handle high traffic loads and distribute it across multiple servers.

• Popular CDN p...read more

To display different colors in a table using CSS for odd and even rows, you can use the :nth-child() selector.

• Use the :nth-child(odd) selector to target odd rows and apply a specific color using the background-color property.

• Use the :nth-child(even) selector to target even rows and apply a different color using the background-color property.

• For example, you can use CSS code like this: tr:nth-child(odd) { background-c...read more

To develop CSS for different devices, use media queries, responsive design principles, and testing on various devices.

• Use media queries to apply different CSS styles based on the device's screen size

• Follow responsive design principles to ensure the layout adapts to different devices

• Test the CSS on various devices to ensure compatibility and responsiveness

The $rootscope is a service in AngularJS that provides a global scope for sharing data between controllers.

• It is a part of the AngularJS framework.

• It is used to share data between controllers.

• It is a singleton object accessible throughout the application.

• It can be used to broadcast and listen to events.

jQuery is a fast, small, and feature-rich JavaScript library that simplifies HTML document traversal and manipulation, event handling, and animation.

• jQuery is a JavaScript library.

• It simplifies HTML document traversal and manipulation.

• It provides easy event handling and animation.

• jQuery is fast, small, and feature-rich.

Check if left child is less than right child in a binary tree

• Traverse the tree recursively and compare left and right child values

• Use a stack to traverse the tree iteratively and compare left and right child values

• Return true if all left children are less than right children, else false

Use built-in string method to check substring presence for faster execution.

• Use 'indexOf' method to check if substring is present in the main string.

• If the method returns -1, the substring is not present.

• If the method returns a non-negative integer, the substring is present.

App performance analysis involves identifying and resolving bottlenecks to improve user experience.

• Collect and analyze performance metrics such as response time, CPU usage, memory usage, and network latency.

• Identify and prioritize bottlenecks based on impact on user experience and frequency of occurrence.

• Implement optimizations such as caching, code refactoring, and database tuning.

• Continuously monitor and test perform...read more