Code to be written in python:
Correct answer will be automatically awarded the brainliest!

Since you now have a good understanding of the new situation, write a new num_of_paths function to get the number of ways out. The function should take in a map of maze that Yee Sian sent to you and return the result as an integer. The map is a tuple of n tuples, each with m values. The values inside the tuple are either 0 or 1. So maze[i][j] will tell you what's in cell (i, j) and 0 stands for a bomb in that cell.
For example, this is the maze we saw in the previous question:

((1, 1, 1, 1, 1, 1, 1, 1, 0, 1),
(1, 0, 0, 1, 1, 1, 0, 0, 1, 1),
(0, 1, 1, 1, 0, 0, 1, 1, 1, 0),
(1, 1, 0, 1, 1, 1, 1, 0, 1, 1),
(0, 1, 0, 1, 0, 0, 1, 0, 1, 0),
(1, 0, 1, 1, 1, 1, 0, 1, 1, 1),
(0, 1, 1, 1, 1, 1, 1, 1, 1, 0),
(1, 0, 1, 0, 0, 1, 1, 0, 1, 1),
(1, 0, 1, 1, 1, 0, 1, 0, 1, 0),
(1, 1, 0, 1, 0, 1, 0, 1, 1, 1))
Note: You should be using dynamic programming to pass time limitation test.

Hint: You might find the following algorithm useful:

Initialize an empty table (dictionary), get the number of rows n and number of columns m.
Fill in the first row. For j in range m:
2.1 If maze[0][j] is safe, set table[(0, j)] to be 1 because there's one way to go there.
2.2 If maze[0][j] has a bomb, set table[(0, k)] where k >= j to be 0. Since one cell is broken along the way, all following cells (in the first row) cannot be reached.
Fill in the first column. For i in range n:
3.1 If maze[i][0] is safe, set table[(i, 0)] to be 1 because there's one way to go there.
3.2 If maze[i][0] has a bomb, set table[(i, 0)] and all cells under it to be 0. The reason is same as for the first row.

Main dynamic programming procedure - fill in the rest of the table.
If maze[i][j] has a bomb, set table[(i, j)] = 0.
Otherwise, table[(i, j)] = table[(i - 1, j)] + table[(i, j - 1)]
Return table[(n - 1, m - 1)]

Incomplete code:

def num_of_paths(maze):
# your code here

# Do NOT modify
maze1 = ((1, 1, 1, 1, 1, 1, 1, 1, 0, 1),
(1, 0, 0, 1, 1, 1, 0, 0, 1, 1),
(0, 1, 1, 1, 0, 0, 1, 1, 1, 0),
(1, 1, 0, 1, 1, 1, 1, 0, 1, 1),
(0, 1, 0, 1, 0, 0, 1, 0, 1, 0),
(1, 0, 1, 1, 1, 1, 0, 1, 1, 1),
(1, 1, 0, 1, 0, 1, 0, 0, 1, 1),
(0, 1, 1, 1, 1, 1, 1, 1, 1, 0),
(1, 0, 1, 0, 0, 1, 1, 0, 1, 1),
(1, 0, 1, 1, 1, 0, 1, 0, 1, 0),
(1, 1, 0, 1, 0, 1, 0, 1, 1, 1))

maze2 = ((1, 1, 1, 1, 1, 1, 1, 1, 1),
(1, 1, 1, 1, 1, 1, 1, 1, 1),
(1, 1, 1, 1, 1, 1, 1, 1, 1),
(1, 1, 1, 1, 1, 1, 1, 1, 1),
(1, 1, 1, 1, 1, 1, 1, 1, 1),
(1, 1, 1, 1, 1, 1, 1, 1, 1),
(1, 1, 1, 1, 1, 1, 1, 1, 1))

maze3 = ((1, 0, 1, 1),
(1, 0, 1, 1),
(1, 0, 1, 1),
(1, 0, 1, 1),
(1, 0, 1, 0),
(1, 0, 0, 1))

Test Cases:
num_of_paths(maze1) 2
num_of_paths(maze2) 3003
num_of_paths(maze3) 0

Answers

Answer 1

Here is the completed num_of_paths function:

def num_of_paths(maze):
# Initialize an empty table (dictionary)
table = {}
# Get the number of rows and number of columns
n = len(maze)
m = len(maze[0])

# Fill in the first row
for j in range(m):
# If maze[0][j] is safe, set table[(0, j)] to be 1 because there's one way to go there
if maze[0][j] == 0:
table[(0, j)] = 1
# If maze[0][j] has a bomb, set table[(0, k)] where k >= j to be 0.
# Since one cell is broken along the way, all following cells (in the first row) cannot be reached
else:
for k in range(j, m):
table[(0, k)] = 0
break

# Fill in the first column
for i in range(n):
# If maze[i][0] is safe, set table[(i, 0)] to be 1 because there's one way to go there
if maze[i][0] == 0:
table[(i, 0)] = 1
# If maze[i][0] has a bomb, set table[(i, 0)] and all cells under it to be 0.
# The reason is same as for the first row
else:
for k in range(i, n):
table[(k, 0)] = 0
break

# Main dynamic programming procedure - fill in the rest of the table
for i in range(1, n):
for j in range(1, m):
# If maze[i][j] has a bomb, set table[(i, j)] = 0
if maze[i][j] == 1:
table[(i, j)] = 0
# Otherwise, table[(i, j)] = table[(i - 1, j)] + table[(i, j - 1)]
else:
table[(i, j)] = table[(i - 1, j)] + table[(i, j - 1)]

# Return table[(n - 1, m - 1)]
return table[(n - 1, m - 1)]

You can test the function using the following code:

# Test maze1
print(num_of_paths(maze1) )

# Expected output: 2

# Test maze2
print (num_of_paths(maze2) )

# Expected output: 1

NOTE: I can also provide a picture of the code (2)

Related Questions

Type the program's output states = ['CA', 'NY', 'TX', 'FL', 'MA'] for (position, state) in enumerate(states): print(state, position)

Answers

Answer:

states = ['CA', 'NY', 'TX', 'FL', 'MA']

for (position, state) in enumerate(states):

print(state, position)

Output:

CA 0

NY 1

TX 2

FL 3

MA 4

If you have a PC, identify some situations in which you can take advantage of its multitasking capabilities.

Answers

Situation one: using multiple monitors for tutorials on one screen and an application on another

Situation two: using virtual desktops for separating school and personal applications

Write a Java program that have ten integral values into an array namely List. Your program
should have a menu to select/perform the following functions :-
lnsert ( ) - accept a value into the array if it's not full
Remove ( ) - remove a value from an array if it's not empty based on user selection
Search ( ) - Return the numbers of the particular search value
lncrease ( ) - lncrease the percentage of the store value based onto the input percentage
Update ( ) - Edit the existing value choose by user.

Answers

Here is a Java program that includes a menu with the four functions you specified: Insert, Remove, Search, and Increase. The program uses an array named "List" to store the integral values, and allows the user to perform the specified actions on the array. I have also included a function called "Update" that allows the user to edit an existing value in the array based on their selection.

import java.util.Scanner;

public class ArrayMenu {
static Scanner input = new Scanner(System.in);
static int[] List = new int[10];
static int size = 0;

public static void main(String[] args) {
boolean exit = false;
while (!exit) {
System.out.println("Menu:");
System.out.println("1. Insert a value");
System.out.println("2. Remove a value");
System.out.println("3. Search for a value");
System.out.println("4. Increase the value of all elements by a percentage");
System.out.println("5. Update an existing value");
System.out.println("6. Exit");
System.out.print("Enter your choice: ");
int choice = input.nextInt();
switch (choice) {
case 1:
insert();
break;
case 2:
remove();
break;
case 3:
search();
break;
case 4:
increase();
break;
case 5:
update();
break;
case 6:
exit = true;
break;
default:
System.out.println("Invalid choice. Please try again.");
break;
}
}
}

public static void insert() {
if (size < 10) {
System.out.print("Enter a value to insert: ");
int value = input.nextInt();
List[size] = value;
size++;
} else {
System.out.println("Array is full. Cannot insert a new value.");
}
}

public static void remove() {
if (size > 0) {
System.out.print("Enter the index of the value to remove: ");
int index = input.nextInt();
if (index >= 0 && index < size) {
for (int i = index; i < size - 1; i++) {
List[i] = List[i + 1];
}
size--;
} else {
System.out.println("Invalid index. Please try again.");
}
} else {
System.out.println("Array is empty. Cannot remove a value.");
}
}

public static void search() {
System.out.print("Enter a value to search for: ");
int value = input.nextInt();
boolean found = false;
for (int i = 0; i < size; i++) {
if (List[i] == value) {
System.out.println("Value found at index " + i);
found = true;
}
}
if (!found) {
System.out.println("Value not found in the array.");
}

solve the MRS y,x = 12 mean?

Answers

Answer:

Explanation:

The MRS (Marginal Rate of Substitution) is a concept from microeconomics that describes the rate at which one good (in this case, y) can be substituted for another good (in this case, x) while still maintaining the same level of utility or satisfaction for the consumer.

The equation you provided, MRS y,x = 12, tells us that in order for a consumer to maintain the same level of satisfaction, they would be willing to give up 12 units of good y in exchange for 1 unit of good x. This means that, in this specific case, the consumer values good y 12 times more than good x.

It's important to keep in mind that the MRS is a concept that can vary depending on the context and the consumer. The value of the MRS can change depending on the consumer's preferences, the availability of the goods, and the prices of the goods, among other factors.

On this equation alone, I can't confirm what exactly it refers to as more information about the context and the goods themselves is needed, also to make this equation valuable, it's should be done in a utility function or optimization problem in order to give some meaning to the number 12.

Which of the following components could you add to your network rec to help protect your servers from brown outdoor blackouts an ethernet switch patch panel

Answers

Assuming your local area experiences brownouts or blackouts during frequent electrical storms. A component which you could add to your network rack to help protect your servers from brownouts or blackouts include the following: A. UPS.

What is a UPS?

In Computer technology, UPS is an abbreviation for Uninterrupted Power Supply and it can be defined as a device that is designed and developed to with an enhanced battery system, in order to allow a computer and other electrical devices to keep running and functioning for at least a short time in the event of a power disruption or when the incoming (input) power is interrupted.

Generally speaking, a short-term decrease in electrical power availability is typically referred to as a brownout.

In order to protect a network equipment such as a router, server, or switch from brownouts or blackouts during frequent electrical storms, you must add an Uninterrupted Power Supply (UPS) to your network rack.

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Complete Question:

Your local area experiences brownouts or blackouts during frequent electrical storms. Which of the following components could you add to your network rack to help protect your servers from brownouts or blackouts?

UPS

Ethernet switch

Patch panel

Wireless controller

Can someone write a code that makes circles change colors. Name it update () function.

Answers

Using the knowledge in computational language in python it is possible write a code that makes circles change colors.

Writting the code:

import PyQt5, sys, time,os

from os import system,name

from PyQt5 import QtCore, QtGui, QtWidgets

from PyQt5.QtCore import QPoint,QTimerEvent,QTimer,Qt

from PyQt5.QtWidgets import QWidget,QApplication,QMainWindow

from PyQt5.QtGui import QPainter

class Stoplight(QMainWindow):

def __init__(self,parent = None):

QWidget.__init__(self,parent)

self.setWindowTitle("Stoplight")

self.setGeometry(500,500,250,510)

def paintEvent(self,event):

radx = 50

rady = 50

center = QPoint(125,125)

p = QPainter()

p.begin(self)

p.setBrush(Qt.white)

p.drawRect(event.rect())

p.end()

p1 = QPainter()

p1.begin(self)

p1.setBrush(Qt.red)

p1.setPen(Qt.black)

p1.drawEllipse(center,radx,rady)

p1.end()

class Stoplight1(Stoplight):

def __init__(self,parent = None):

QWidget.__init__(self,parent)

self.setWindowTitle("Stoplight")

self.setGeometry(500,500,250,510)

def paintEvent(self,event):

radx = 50

rady = 50

center = QPoint(125,125)

p = QPainter()

p.begin(self)

p.setBrush(Qt.white)

p.drawRect(event.rect())

p.end()

p1 = QPainter()

p1.begin(self)

p1.setBrush(Qt.green)

p1.setPen(Qt.black)

p1.drawEllipse(center,radx,rady)

p1.end()

if __name__ == "__main__":

application = QApplication(sys.argv)

stoplight1 = Stoplight()

stoplight2 = Stoplight1()

time.sleep(1)

stoplight1.show()

time.sleep(1)

stoplight2.show()

sys.exit(application.exec_())

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Meredith's repair business has two offices—one on the east side of town and one on the west side. An employee may work out of one office on one day and the other office on the next, based on the workload on a given day. For this reason, Meredith found it useful to set up a network to connect both offices. The company's important files are stored on a server so that employees can access the information they need from either location. The type of network Meredith's business is most likely using is a _____.

WAN
MAN
LAN

Answers

Answer:

MAN

Explanation:

brainliest?:(

Answer:

WAN (Wide Area Network)

Rory has asked you for advice on (1) what types of insurance she needs and (2) how she should decide on the coverage levels vs monthly premium costs. Give Rory specific recommendations she can follow to minimize her financial risk but also keep a balanced budget.

Answers

She should get a basic health insurance plan with a monthly premium choice as she is a single lady without children in order to make payments more convenient.

How much does health insurance cost?

All full-time employees (30 hours or more each week) have their health insurance taken out of their paychecks. It will total 9.15 percent of your salary when combined with your pension payment. For illustration, a person making 300,000 per month will have 27,450 taken out.

Where in the world is medical treatment free?

Only one nation—Brazil—offers universally free healthcare. According to the constitution, everyone has the right to healthcare. Everyone in the nation, even transient guests, has access to free medical treatment.

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A table student consists of 5 rows and 7 columns. Later on 3 new attributes are added and 2 tuples are deleted. After some time 5 new students are added. What will be the degree and cardinality of the table?

Answers

Answer:

The degree of a table refers to the number of attributes (columns) it has. In the case you described, after the 3 new attributes are added, the degree of the table would be 7 + 3 = 10.

The cardinality of a table refers to the number of rows (tuples) it has. In the case you described, after 2 tuples are deleted, the cardinality of the table would be 5 - 2 = 3. After 5 new students are added, the cardinality would increase to 3 + 5 = 8.

Use routers, Switches and Hubs to design a simple network for Maendeleo Institute of Technology having 240 employees. The Institute has five departments: Computer Science has 100 employees, Information Technology 60 employees, Accounts 40 employees, Human Resource has 20 employees and Marketing has 20 employees.

Required:

• Network topology showing five network that corresponds to five departments.

• Use Class C IP addresses (example 192.168.10.0/24) to show the subnet ID and broadcast ID of each department, the IP address must not overlap

• Consider Scalability

• Give reasons for your choice/ decisions

Answers

Answer:

To design a simple network for Maendeleo Institute of Technology with 240 employees, we could use a combination of routers, switches, and hubs.

Our network would consist of five separate networks, one for each department at the institute. We would use class C IP addresses, with a subnet mask of /24, to create the following subnets:

Computer Science department: 192.168.10.0/24

Information Technology department: 192.168.11.0/24

Account department: 192.168.12.0/24

Human Resource department: 192.168.13.0/24

Marketing department: 192.168.14.0/24

Each department would be connected to the network via a switch, which would allow for communication within the department and with other departments as needed. A router would be used to connect the individual department networks to the wider internet, and would also serve as a firewall to protect the network from external threats.

We would also include a hub in the network to allow for communication between devices within a department, as well as to provide additional connectivity and scalability.

Overall, our network design would provide each department with its own separate network, with the ability to communicate with other departments as needed. It would also be scalable, allowing for the addition of new devices and departments as the institute grows. The use of class C IP addresses and a /24 subnet mask would ensure that IP addresses do not overlap, ensuring efficient and reliable communication within the network.

List 2 or 3 visual aids that you might use during a speech on "Technology in the Classroom" (or a topic of your choosing) to illustrate your main points, and explain exactly how you plan to use them. (Site 1)

Answers

Answer:

Graphs or charts: I would use graphs or charts to illustrate the trend of technology usage in the classroom over time. For example, I could show a line graph that compares the percentage of classrooms that had no technology, limited technology, or full technology access in the past decade. This would allow the audience to see the increasing trend of technology adoption in the classroom and better understand the impact that technology is having on education.

Photos or videos: I would use photos or videos to provide concrete examples of how technology is being used in the classroom to enhance teaching and learning. For example, I could show a video of a teacher using a virtual reality headset to take her students on a virtual field trip to a museum, or I could show a series of photos of students using tablets or laptops to complete assignments and collaborate with their peers. These visual aids would help the audience to better understand the specific ways in which technology is being used in the classroom and how it is benefiting students and teachers.

Infographic: I would use an infographic to present a summary of the main points of my speech in a visually appealing and easy-to-understand format. The infographic could include bullet points or graphics that highlight the key benefits of technology in the classroom, such as increased engagement, improved learning outcomes, and enhanced collaboration. By presenting the information in this way, I could help the audience to quickly grasp the main points of my speech and better retain the information.

What benefit do internal networked e-mail systems provide over Internet-based systems?

A) They enable the transmission of videos.
B) They allow e-mail to be sent to coworkers.
C) They allow files to be shared by sending attachments.
D) They provide increased security.

Answers

Answer:

The correct answer is D) They provide increased security.

technology helps to produce, manipulate, store, communicate, and/or disseminate information. a. Computer b. Nano c. Communication d. Information O O

Answers

The technology that helps to produce, manipulate, store, communicate, and/or disseminate information are:

a. Computer

b. Communication

d. Information

What is the technology about?

Computer technology helps to produce, manipulate, store, and communicate information through various software and hardware.

Communication technology helps to disseminate information through various means of communication such as phone, internet, radio, and television.

Therefore, Information technology encompasses all technologies used to handle and process information, including computer and communication technology.

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How do networks help protect data?

A) by shutting down at 5:00 p.m. each evening
B) by restricting access to department chairs
C) by scheduling regular backups
D) by preventing access by more than one person at a time

Answers

D) by preventing access by more than one person at a time

Networks use authentication and authorization to control access to data. They require that a person entering the network has valid credentials, such as a username and password, before they can access any data on the network. Once the credentials have been provided and verified, the user is typically given limited access to the data that is based on authorization rules set up within the network. This helps ensure that data is securely accessed by only those users that need to access it, preventing unauthorized access by multiple persons at once.

Which computers were the first PCs with a GUI
MS-DOS
Linux
Windows
Mac

Answers

The earliest GUI-equipped PCs were Linux and Mac-based. These are the right answers to the question that was asked.

Which PCs had a graphical user interface (GUI) first?

The first computer to employ a mouse, the desktop metaphor, and a graphical user interface (GUI), concepts Douglas Engelbart first introduced while at International, was the Xerox Alto, developed at Xerox PARC in 1973. It was the first instance of what is now known as a full-fledged personal computer.

When was the GUI added to Windows?

Windows is based on what is known as a graphical user interface (GUI), which was created by Xerox in 1975 but was never used. The "window, icon, menu, and pointing device" (WIMP) combination will make up the majority of a typical GUI.

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one example of FLAT artwork is tagged image file format which is a common computer what file

Answers

One example of FLAT artwork is the Tagged Image File Format (TIFF). TIFF is a common computer file format used for storing raster images.

What is the image file format about?

It is a flexible format that can support a wide range of color depths and image compression methods. It is often used for high-quality images, such as those used in printing, and is supported by a wide range of image-editing software.

Therefore, based on the context of the above, TIFF files are FLAT artwork as they are a single, static image without any animations or interactivity.

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Write a program that will ask the user to enter the amount of a purchase. The program should then compute the state and county sales tax. Assume the state sales tax is 5 percent and the county sales tax is 2.5 percent.in python

Answers

Answer:

This program first prompts the user to enter the amount of the purchase. It then defines the state and county sales tax rates as constants. It calculates the state and county sales tax amounts by multiplying the purchase amount by the appropriate tax rate. Finally, it calculates the total sales tax by adding the state and county sales tax amounts together, and prints the results.

Explain TWO examples of IT usages in business (e.g.: application or system) that YOU
have used before. Discuss your experience of using these system or applications. The
discussions have to be from YOUR own experience

Answers

Answer:

(DO NOT copy from other sources). Discuss these systems or applications which include of:

Introduction and background of the application or system. Support with a diagram, screenshots or illustration.

Explanation:

explain the fundamental Components of a Programming Language
can u answer in 8 lines

Answers

Answer:

1. Syntax: Syntax is the structure of a programming language which includes rules for constructing valid statements and expressions.

2. Data Types: Data types are used to define the type of data that is stored in a variable.

3. Variables: Variables are used to store data values.

4. Operators: Operators are used to perform operations on variables and values.

5. Control Structures: Control structures are used to control the flow of a program.

6. Functions: Functions are used to group related code into a reusable block.

7. Libraries: Libraries are collections of functions and data structures that can be used in a program.

8. Comments: Comments are used to document code and make it easier to understand.

Explanation:

Create a program that asks the user to input three integers. After saving the values, the
program should identify the maximum and minimum from the three numbers. The output
should read
The minimum number entered was….
The maximum number entered was….

Answers

Here is a Python program that asks the user to input three integers and then outputs the minimum and maximum number:

4.3 lesson practice phython

Answers

Answer:

user input loop

count variable

user input

Explanation:

these are you answers

Put the networks below in order according to the geographic distance they cover. Put a one next to the network that covers the largest area, a two next to the one that covers the second largest area, etc.

LAN

WAN

MAN

Answers

Answer:

LAN

MAN

WAN

Explanation:

A LAN (Local Area Network) typically covers a small geographic area, such as a single building or campus. A MAN (Metropolitan Area Network) covers a larger geographic area, such as a city or metropolitan region. A WAN (Wide Area Network) covers the largest geographic area, such as a country or the entire world.

• Describe the core components and terminology of Group Policy.

Answers

The core components and terminology of the group policy are directory services and file sharing.

What is the group policy component?

A GPO is a virtual object that stores policy-setting information and consists of two parts: GPO's and their attributes are saved in a directory service, such as Active Directory.

It essentially provides a centralized location for administrators to manage and configure the settings of operating systems, applications, and users.

File share: GPO's can also save policy settings to a local or remote file share, such as the Group Policy file share.

Therefore, the group policy's main components and terminology are directory services and file sharing.

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Gigantic Life Insurance has 4000 users spread over five locations in North America. They have called you as a consultant to discuss different options for deploying Windows 10 to the desktops in their organization. They are concerned that users will be bringing their own mobile devices such as tablets and laptops to connect to their work data. This will improve productivity, but they are concerned with what control they have over the users' access to corporate data. How will Windows 10 help the company manage users who bring their own devices?

Answers

The answer is nuclear reactions

The most reliable way to store important files without having to worry about backups or media failure is ____________.

A) cloud storage
B) on a USB flash drive
C) on a hard disk drive
D) on an optical disc

Answers

The answer to this question is letter B

A. Cloud storage

The ideal approach to save data for a longer time is cloud storage. Data security and storage reliability are two advantages of cloud storage that can't be matched. In addition, end-to-end encryption ensures the safety of all transmitted data.

Alvin has designed a storyboard using the following technique. Which storyboard technique did he use?

A.
hierarchical
B.
linear
C.
webbed
D.
wheel

50 Points <3

Answers

Answer:

D. Wheel storyboard

Explanation:

The wheel method is like spokes connected to a main hub.

how to Design a registration page for a school called At school complex with html

Answers

Answer:

<!DOCTYPE html>

<html>

<head>

<title>At School Complex Registration</title>

</head>

<body>

<h1>At School Complex Registration</h1>

<form>

<label for="email">Email:</label><br>

<label for="phone">Phone:</label><br>

<label for="grade">Grade Level:</label><br>

<option value="kindergarten">Kindergarten</option>

<option value="elementary">Elementary</option>

<option value="middle">Middle</option>

</select>

<br>

<label for="activities">I am interested in after-school activities</label><br>

</form>

</body>

</html>

Explain how abstraction makes your computer easier to use. Give at least one example.

Answers

Abstraction removes all specific details, and any problems that will help you solve the problem. Thus makes your computer easier to use.

What is abstraction?

An abstraction is a generic thought as opposed to one that pertains to a specific thing, person, or circumstance. The concept of abstraction is one that applies to both the actual world and OOP languages.

The typical details of an idea are left out. Code that uses abstractions is simpler to comprehend since it focuses on the main functions and operations rather than the minute details. Don't program to implementations; program to interfaces.

Therefore, abstraction eliminates all specific information and any issues that could aid in problem-solving.

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python best hashing algorithm for passwords with mysql

Answers

Answer: So you Wait a minute I do believe that mysql is a sql cracking suit but you would need to build a hashing suit or you could use passlib.hash.mysql41 so you are looking to crack some stuff ok look at the file I sent.

Explanation:

Code to be written in Python:
Correct answer will get the brainliest!

Uyen decides to write a Python program to count towards the next birthday.
In order to do so, she plans to write a function count_days(start_date, end_date) which takes in the start date and end date in the string format, "dd/mm/yyyy", and returns the number of days between the start date and end date. The start date is included while the end date is not included in the count. Note that leading zeros in start_date and end_date are skipped if there are any (For example, the date 1st January 2017 will be in the format 1/1/2017).

Currently, Uyen has only completed a skeleton of count_days, and a few helper functions, which are provided below.

Your Tasks:

(a) Help Uyen complete the four functions marked with 'TODO'. They are get_day_month_year, less_than_equal, next_date and count_days.

(b) Uyen was quite careless, she didn't check for input data validity. You will also need to help her with this. We only proceed to count days if the dates are valid, and the start date is before or same as the end date.

Assume a valid date is between 1/1/1970 and 31/12/9999. The leap year and valid date check are already provided.
If one of the dates is not valid, throw an exception with a message that has the value: "Not a valid date: " + date, where date is the invalid date.
If the start date is after the end date, throw an exception with a message value: "Start date must be less than or equal end date."

Note: is_leap_year(year) and is_valid(d, m, y) are provided, you can make use of them.

Incomplete code:

def is_leap_year(year):
# DONE: do not need to modify
if year % 4 == 0 and year % 100 != 0:
return True
if year % 400 == 0:
return True
return False

def is_valid(d, m, y):
# DONE: do not need to modify
# d, m, y represents day, month, and year in integer.
if y < 1970 or y > 9999:
return False
if m < 1 or m > 12:
return False
if d < 1 or d > 31:
return False

if m == 4 or m == 6 or m == 9 or m == 11:
if d > 30:
return False

if is_leap_year(y):
if m == 2 and d > 29:
return False
else:
if m == 2 and d > 28:
return False

return True

def get_day_month_year(date):
# TODO: split the date and return a tuple of integer (day, month, year)
d = 1
m = 1
y = 1970
return (d, m, y)

def less_than_equal(start_day, start_mon, start_year, \
end_day, end_mon, end_year):
# TODO: return true if start date is before or same as end date
return False

def next_date(d, m, y):
# TODO: get the next date from the current date (d, m, y)
# return a tuple of integer (day, month, year).
return (d, m, y)

def count_days(start_date, end_date):
# date is represented as a string in format dd/mm/yyyy
start_day, start_mon, start_year = get_day_month_year(start_date)
end_day, end_mon, end_year = get_day_month_year(end_date)

# TODO: check for data validity here #
# if start date is not valid...
# if end date is not valid...
# if start date > end date...

# lazy - let the computer count from start date to end date
count = 0
while less_than_equal(start_day, start_mon, start_year, end_day, end_mon, end_year):
count = count + 1
start_day, start_mon, start_year = next_date(start_day, start_mon, start_year)

# exclude end date
return count - 1

Test Cases:

test_count_days('1/1/1970', '2/1/1970') 1
test_count_days('1/1/1970', '31/12/1969') Not a valid date: 31/12/1969
test_count_days('1/1/1999', '29/2/1999') Not a valid date: 29/2/1999
test_count_days('14/2/1995', '19/3/2014') 6973
test_count_days('19/3/2014', '19/4/2013') Start date must be less than or equal end date.
get_day_month_year('19/3/2014') (19, 3, 2014)
get_day_month_year('1/1/1999') (1, 1, 1999)
get_day_month_year('12/12/2009') (12, 12, 2009)
less_than_equal(19, 3, 2014, 19, 3, 2014) True
less_than_equal(18, 3, 2014, 19, 3, 2014) True
less_than_equal(20, 3, 2014, 19, 3, 2014) False
less_than_equal(19, 3, 2015, 19, 3, 2014) False
less_than_equal(19, 6, 2014, 19, 3, 2014) False
less_than_equal(18, 12, 2014, 19, 11, 2014) False
less_than_equal(18, 12, 2014, 19, 11, 2015) True
less_than_equal(31, 3, 2018, 29, 4, 2018) True
next_date(1, 1, 2013) (2, 1, 2013)
next_date(28, 2, 2014) (1, 3, 2014)
next_date(28, 2, 2012) (29, 2, 2012)
next_date(29, 2, 2012) (1, 3, 2012)
next_date(30, 4, 2014) (1, 5, 2014)
next_date(31, 5, 2014) (1, 6, 2014)
next_date(31, 12, 2014) (1, 1, 2015)
next_date(30, 5, 2014) (31, 5, 2014)

Answers

PYTHON

To complete the function get_day_month_year(date), we can split the date string using the / character as a delimiter and return a tuple of integers:

def get_day_month_year(date):

day, month, year = date.split('/')

return (int(day), int(month), int(year))

To complete the function less_than_equal(start_day, start_mon, start_year, end_day, end_mon, end_year), we can compare the year, month, and day of the start date to the year, month, and day of the end date and return True if the start date is less than or equal to the end date:

def less_than_equal(start_day, start_mon, start_year, end_day, end_mon, end_year):

if start_year < end_year:

return True

elif start_year == end_year:

if start_mon < end_mon:

return True

elif start_mon == end_mon:

if start_day <= end_day:

return True

return False

To complete the function next_date(d, m, y), we can first increment the day by 1 and check if the resulting date is valid. If it is not valid, we can set the day to 1 and increment the month by 1. We can continue this process until we reach a valid date:

def next_date(d, m, y):

d += 1

while not is_valid(d, m, y):

d = 1

m += 1

if m > 12:

m = 1

y += 1

return (d, m, y)

Finally, to complete the function count_days(start_date, end_date), we can add code to check the validity of the start and end dates, and throw an exception if either of them is not valid or if the start date is after the end date. We can do this by calling the is_valid function and the less_than_equal function:

def count_days(start_date, end_date):

start_day, start_mon, start_year = get_day_month_year(start_date)

end_day, end_mon, end_year = get_day_month_year(end_date)

if not is_valid(start_day, start_mon, start_year):

raise Exception("Not a valid date: " + start_date)

if not is_valid(end_day, end_mon, end_year):

raise Exception("Not a valid date: " + end_date)

if not less_than_equal(start_day, start_mon, start_year, end_day, end_mon, end_year):

raise Exception("Start date must be less than or equal end date.")

count = 0

while less_than_equal(start_day, start_mon, start_year, end_day, end_mon, end_year):

count = count + 1

start_day, start_mon, start_year = next_date(start_

Hope This Helps You!

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