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1492 questions

User Input

- User interface contains two types of user input controls: TextInput, which accepts all characters and NumericInput, which accepts only digits. Implement the class TextInput that contains: Public sub Add(c As Char) - adds the given character to the current value Public function GetValue() As String - returns the current value Implement the class NumericInput that: Inherits TextInput Overrides the Add method so that each non-numeric character is ignored For example, the following code should output "10": Dim input As TextInput = New NumericInput() input.Add(CChar("1")) input.Add(CChar("a")) input.Add(CChar("0")) Console.WriteLine(input.GetValue())
VB.NET
Inheritance
OOP
Easy
15 min
code
Public

Mirrored Writing

- While training to be a workplace investigator, you are taught to read mirrored writing so you can read a suspect's monitor that is facing away from you when there is a window or mirror behind it. To test your skill, you are asked to compare a list of passwords to a list of mirrored images. Password # Passwords Mirrored Images 1 !0O0Okvt!!xfsOO1 2 hRBZZFdGyXm/S4q 3 1//1VWwvO0OO1!1! 4 H-{;G6kB8T%vd(+f 5 77jG872LB!PbPbR3 6 F_R8)B8^LEP";ku 7 k%^cK3_;<wvZ@m){ 8 Ha,3[=D(e>#z29Y. Which of the passwords are the same as the mirrored images?
New
Attention to Detail
Exact Match
Verifying Data
Hard
3 min
mca
Public

Http Server

- A company hosts its website and a product API on same server using the code below: let http = require("http"); let commonResponse = function(response){ response.writeHead(200, { "Content-Type": "text/html" }); response.write("Request Completed"); } let handleApi = function(req, res){ if(req.method == "POST"){ commonResponse(res); res.end(); } } let handleWeb = function(req, res){ commonResponse(res) res.end(); } http.createServer(handleApi).listen(4513); http.createServer(handleWeb).listen(4514); Select all the correct answers.
Node.js
Standard Library
Easy
5 min
mca
Public

Route Planner

- As a part of the route planner, the routeExists method is used as a quick filter if the destination is reachable, before using more computationally intensive procedures for finding the optimal route. The roads on the map are rasterized and produce a matrix of boolean values - true if the road is present or false if it is not. The roads in the matrix are connected only if the road is immediately left, right, below or above it. Finish the routeExists method so that it returns true if the destination is reachable or false if it is not. The fromRow and fromColumn parameters are the starting row and column in the mapMatrix. The toRow and toColumn are the destination row and column in the mapMatrix. The mapMatrix parameter is the above mentioned matrix produced from the map. For example, for the given rasterized map, the code below should return true since the destination is reachable: boolean[][] mapMatrix = { {true, false, false}, {true, true, false}, {false, true, true} }; routeExists(0, 0, 2, 2, mapMatrix);
New
Java
2D Array
Algorithmic Thinking
Graphs
Hard
30 min
code
Public

Lumber Cut

- A construction supply company wants to implement a data warehouse to analyze the performance of their online portal for ordering custom cuts of lumber. Their sales data is currently stored in two separate transaction processing relational databases, one contains inventory and the other one contains sales data. Both databases save their data in a normalized schema. One of the reasons for implementing a data warehouse is that it takes too much time to query the databases for average sales data and inventory status, which causes some online transactions to timeout. How should the data warehouse be implemented?
New
Data Warehouse
Software Architecture
Easy
3 min
mca
Public

Workers

- The following data definition defines an organization's employee hierarchy. An employee is a manager if any other employee has their managerId set to this employee's id. That means John is a manager if at least one other employee has their managerId set to John's id. TABLE employees id INTEGER NOT NULL PRIMARY KEY managerId INTEGER name VARCHAR(30) NOT NULL FOREIGN KEY (managerId) REFERENCES employees(id) Write a query that selects only the names of employees who are not managers. See the example case for more details.
SQL
Conditions
Select
Subqueries
Hard
7 min
code
Public

Address Template

- Finish the AddressListComponent's template so that it renders one li element per address and it correctly one-way binds each field of the AddressComponent field. For example, if the addresses array is: [{ street: "Third Avenue‎", city: "New York", zipCode: "10001" }, { street: "Constitution Avenue", city: "Washington", zipCode: "20001" }] the template should render to: <ul> <li> <app-address> <p>Third Avenue</p> <p>New York</p> <p>10001</p> </app-address> </li> <li> <app-address> <p>Constitution Avenue</p> <p>Washington</p> <p>20001</p> </app-address> </li> </ul> The code for running the example case locally is provided here. 
New
Angular
Components
Directives
Easy
10 min
code
Public

Spot the Duplicates 1

- Select the tile below that should be placed in the unknown tile above so that all three rows above follow the same pattern.
Abstract Reasoning
Duplicate Elements
Three Horizontal Rows
Easy
2 min
mcq
Public

Environment

- The PATH variable is set in /etc/environment:  PATH="/usr/local/sbin:/usr/local/bin:/usr/games:/usr/local/games" And updated in .bash_profile: export PATH=/usr/temp:$PATH:/usr/local/apps Select the statements are correct.
Bash
Environmental Variable
Easy
3 min
mca
Public

Semantics

- Update the website's HTML, without using JavaScript or CSS, to make use of semantic elements so that: The classless outer div element is replaced with a more appropriate element. The divs with the image and caption classes are replaced with self-contained content elements. The divs with the lorem-ipsum and description classes are replaced with elements, so that by default only the contents of the description element are shown. When the contents of the description element are clicked, the visibility of the rest of the lorem-ipsum element is toggled.
HTML/CSS
Elements and Attributes
HTML5
Semantic Tags
Easy
7 min
code
Public

Late Installation

- You are on the support team for a cable/internet company and you have received the following email from a customer, Mike Smith: I am very upset that your installation tech did not come to my home today at the appointed time. I took time off from work, all for no reason! I was told he should arrive between 12:00 and 5:00. He didn’t get here until 5:45. I could have just stayed at work since I normally get home at 5:30. This is not a good way to start my new service with you and I am already considering canceling! A quick check of the notes on the customer’s account shows that the tech was scheduled to arrive ideally between 12:00 and 5:00pm, but didn’t get there until about 5:45 because of heavy traffic resulting from a car accident on one of the major crosstown roadways. Please draft your response to this customer in the box below.
Customer Emails
Angry Customer
Cancellation Threats
Customer Service
Manually Scored
Easy
7 min
text
Public

Nginx Deployment

- The team responsible for Kubernetes wants to add a Deployment that will deploy 4 nginx Pods which should have port 443 open. Finish the following YAML configuration so that it implements those requirements: apiVersion: apps/v1 kind: ________________ metadata: name: deployment-nginx labels: web: public spec: replicas: __________ selector: matchLabels: web: public template: metadata: labels: _______: __________ spec: containers: - name: nginx image: nginx:1.14.2 ports: - ____________: 443
Kubernetes
Deployment
Services
Easy
5 min
fill
Public

Binary Search Tree

- Binary search tree (BST) is a binary tree where the value of each node is larger or equal to the values in all the nodes in that node's left subtree and is smaller than the values in all the nodes in that node's right subtree. Write a function that, efficiently with respect to time used, checks if a given binary search tree contains a given value. For example, for the following tree: n1 (Value: 1, Left: null, Right: null) n2 (Value: 2, Left: n1, Right: n3) n3 (Value: 3, Left: null, Right: null) Call to contains(n2, 3) should return True since a tree with root at n2 contains number 3.
Python
Algorithmic Thinking
Recursion
Tree
Easy
15 min
code
Public

Poor Lighting

- You drafted an email on your phone in poor lighting while in transit. Now back in the office, you need to proofread what you wrote before sending it out. Read the email draft below. The agenda for next week’s meeting includes presentations from both the marketing and sales teams. Marisol, you will need to has completed the analysis of the most recent campaign by then. You guys need to present slides of those outcomes at the meeting, OK? Meanwhile, Lucas should do something similar for the sales team. Rather than presenting individual case studies, tries to analyze the quarter as a whole this time. Let's nail these presentations and show the executives how much improvement we have made? Which sentences have errors in grammar or punctuation?
New
Written Communication
English Language
Grammar and Punctuation
Easy
3 min
mca
Public

Group Meeting

- You’re available from 9:30am to 2:00pm. Angela is available from 10:30am to 2:30pm. Chris is available from 12pm to 4pm. When are all three of you available for a one-hour meeting?
Scheduling
Time Management
Easy
2 min
mca
Public

Parsing XML

- Which statements are true for the .NET technologies you can use to process XML data?
.NET
Class Library
Serialization
XML
Hard
2 min
mca
Public

Pricing Page

- You were testing two new title ideas for a pricing page with the following results:   Views Conversions Original 4,300 436 Proposal A 4,000 440 Proposal B 3,700 415
A/B Testing
Results Analysis
Statistical Significance
Easy
5 min
mmcq
Public

Account

- Each account on a website has a set of access flags that represent a users access. Update and extend the enum so that it contains three new access flags: A Writer access flag that is made up of the Submit and Modify flags. An Editor access flag that is made up of the Delete, Publish and Comment flags. An Owner access that is made up of the Writer and Editor flags. For example, the code below should print "False" as the Writer flag does not contain the Delete flag. Console.WriteLine(Access.Writer.HasFlag(Access.Delete))
C#
Enum
Hard
7 min
code
Public

Font Formatting

- A word processor uses the following code for defining font format: class FontFormat inherits Object private fontName : String private fontSize : Int public constructor(name : String, size : Int) fontName = name fontSize = size end constructor public function getFontName() : String return fontName end function public function getFontSize() : Int return fontSize end function override public function equals(obj : Object) : Bool if (!(obj instanceof FontFormat)) return false end if FontFormat f = (FontFormat)obj return f.getFontName() == fontName && f.getFontSize() == fontSize end function override public function getHashCode() : Int return fontName.getHashCode() ^ fontSize.getHashCode() end function end class Analysis shows that even the largest documents use fewer than a hundred different combinations of font name and size. The same analysis shows that the application sometimes uses thousands of FontFormat objects, most of which share the same font name and size. (Fill in the blank with the software design pattern that solves the issue.) The ____________ software design pattern can be used to minimize the memory footprint by sharing FontFormat objects.
OOP & Design Patterns
Design Patterns
Structural Patterns
Hard
5 min
fill
Public

Registrations

- Consider the following DDL statement: CREATE TABLE registrations ( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, name VARCHAR(50) NOT NULL, create_date DATE NOT NULL, last_activity DATE NOT NULL ); Fill in the blanks so that the following select returns all registrations that were last active at least 30 days after being created. SELECT name, create_date, last_activity FROM registrations WHERE _____________ >= __________(__________, INTERVAL 30 DAY); See the example case for more details.
MySQL
Date Functions
Easy
7 min
fill
Public