Based on the provided requirements, here's a Python solution that adheres to the given instructions:
```python
def print_longest_movies():
movies = []
while True:
title = input("Movie title (or blank to finish): ")
if not title:
break
duration = int(input("Movie duration (minutes): "))
movies.append((title, duration))
movies.sort(key=lambda x: x[1], reverse=True)
print("= Longest movies in the collection -")
for i, movie in enumerate(movies[:3], 1):
print(f"{i}. {movie[0]} ({movie[1]} minutes)")
print_longest_movies()
```
This code prompts the user to enter movie titles and durations until they input a blank title. It then sorts the movies based on their durations in descending order using the `sort()` method. Finally, it prints the top three longest movies using a loop.
The output of the code execution will match the example runs provided, handling both cases of having more than three movies and fewer than three movies in the collection.
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Which of the following are true of the k-nearest neighbours (KNN) algorithm applied to an n-dimensional feature space? i. For a new test observation, the algorithm looks at the k training observations closest to it in n-dimensional space and assigns it to the majority class among those k observations.
ii. For a new test observation, the algorithm looks at the k training observations closest to it in n-dimensional space and assigns it proportionally to each class represented in those k observations.
iii. KNN models tend to perform poorly in very high dimensions.
iv. KNN models are well-suited to very high-dimensional data.
v. The K in KNN stands for Kepler, the scientist who first proposed the algorithm.
a. i and iii
b. i only
c. ii and iv
d. i, iv and v
e. i, iii and v
The given statements relate to the k-nearest neighbors (KNN) algorithm applied to an n-dimensional feature space. We need to determine which statements are true.
i. True: For a new test observation, the KNN algorithm looks at the k training observations closest to it in n-dimensional space and assigns it to the majority class among those k observations. This is the basic principle of the KNN algorithm.
ii. False: The KNN algorithm assigns the new test observation to the majority class among the k nearest neighbors, not proportionally to each class represented in those k observations.
iii. True: KNN models tend to perform poorly in very high dimensions. This is known as the curse of dimensionality. As the number of dimensions increases, the data becomes more sparse, and the distance metric used by KNN becomes less reliable.
iv. False: KNN models are not well-suited to very high-dimensional data due to the curse of dimensionality. They work better in lower-dimensional spaces.
v. False: The K in KNN stands for "k-nearest neighbors," not Kepler.
Based on the explanations above, the true statements are:
a. i and iii
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During the process of assigning an IP address to a client, which of these comes first O A. DHCP server sends a "DHCP offer" message to the new client OB. The new client broadcasts "DHCP discover" message OC. Client requests IP address using "DHCP request" message OD. DHCP server sends IP address through the "DHCP ack" message
The correct order of the steps in the process of assigning an IP address to a client using DHCP (Dynamic Host Configuration Protocol) is as follows:
OB. The new client broadcasts a "DHCP discover" message.
The client sends out a broadcast message to discover available DHCP servers on the network.
OA. DHCP server sends a "DHCP offer" message to the new client.
Upon receiving the "DHCP discover" message, the DHCP server responds with a "DHCP offer" message, offering an available IP address to the client.
OC. Client requests an IP address using a "DHCP request" message.
The client selects one of the DHCP offers and sends a "DHCP request" message to the DHCP server, requesting the offered IP address.
OD. DHCP server sends the IP address through a "DHCP ack" message.
After receiving the "DHCP request" message, the DHCP server sends a "DHCP ack" message, confirming the allocation of the requested IP address to the client.
So, the correct order is OB, OA, OC, OD.
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Consider a hash table of size m = 2000 and a hash function h(k) = m(kA mod 1)] for A= (V5 - 1)/2. Compute the hash values of 63, 64, and 65.
The hash values for 63, 64, and 65 are approximately 1941.1254932, 1019.6078432, and 98.0891718, respectively.
To compute the hash values of 63, 64, and 65 using the given hash function, we need to substitute the values into the formula h(k) = m(kA mod 1), where A = (sqrt(5) - 1) / 2 and m = 2000.
For k = 63:
h(63) = 2000(63 * ((sqrt(5) - 1) / 2) mod 1)
Simplifying the expression inside the parentheses:
h(63) = 2000(63 * (0.6180339887) mod 1)
h(63) = 2000(38.9705627466 mod 1)
h(63) = 2000(0.9705627466)
h(63) = 1941.1254932
For k = 64:
h(64) = 2000(64 * ((sqrt(5) - 1) / 2) mod 1)
Simplifying the expression inside the parentheses:
h(64) = 2000(64 * (0.6180339887) mod 1)
h(64) = 2000(39.5098039216 mod 1)
h(64) = 2000(0.5098039216)
h(64) = 1019.6078432
For k = 65:
h(65) = 2000(65 * ((sqrt(5) - 1) / 2) mod 1)
Simplifying the expression inside the parentheses:
h(65) = 2000(65 * (0.6180339887) mod 1)
h(65) = 2000(40.0490445859 mod 1)
h(65) = 2000(0.0490445859)
h(65) = 98.0891718
Therefore, the hash values for 63, 64, and 65 are approximately 1941.1254932, 1019.6078432, and 98.0891718, respectively.
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(i) We've been dealing with binary trees in this module, but in this exam, lets deal with 5-ary trees. In a 5-ary tree, each node can have up to five children and a parent (the only node in the tree that has no parent is the root of the tree). n Co C C2 C: C4 The node n contains a reference to an object and references to five children. Each child has an index Co through C from left to right. The node n does not contain a reference to the parent. The node has only one constructor that takes in a reference to the object stored in this node and an array of five children (you do not need to check if there are five). If a child does not exist, the reference is mull. It has a method that returns the object stored at this node getElement (). It also has a method getChild (int i) that takes in an index i (0 through 4) and returns a reference to Node5 which is the appropriate child (which can be null). Write a java generic Node5 that implements the above-described node. [5 marks) 1
In the above code, the Node5 class is defined as a generic class that can store any type of object T. It has an instance variable element to store the object reference, and an array of type Node5<T> called children to store the references to the five children nodes.
Sure! Here's a Java implementation of the generic Node5 class that represents a 5-ary tree node:
java
Copy code
public class Node5<T> {
private T element;
private Node5<T>[] children;
public Node5(T element, Node5<T>[] children) {
this.element = element;
this.children = children;
}
public T getElement() {
return element;
}
public Node5<T> getChild(int i) {
if (i >= 0 && i < children.length) {
return children[i];
}
return null;
}
}
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A census table contains data from the 2020 census with one row for each person in the US including their gender, occupation, age.
There are an index on the gender column, one on the age column, and one on the occupation column.
For the query
select * from census where gender='F' and occupation='CEO' and age<55
which index would give the better performance?
Use the index on occupation and then scan the rows from the index for gender and age.
Use the index on age and scan the rows from the index for gender and occupation.
Since no one index can answer the query, do a linear scan of the table.
Use the index on gender and then scan the rows from the index for age and occupation
This is my second time posting this question the first time answer is not correct. Please give me a correct answer
Option B and D is not correct so we are left with only option A and C
The index on occupation and then scan the rows from the index for gender and age will give the best performance. The query select * from census where gender='F'
and occupation='CEO' and age<55 has three conditions: gender='F', occupation='CEO', and age<55. The index on occupation will allow us to quickly find all rows where the occupation is CEO. We can then scan the rows from the index for gender='F' and age<55.
This will be more efficient than using the index on gender, because the index on occupation will narrow down the search space more.
The index on age will not be very helpful, because it does not contain the gender or occupation columns. So, we would have to scan the entire index, which would be very inefficient.
The linear scan of the table will be the least efficient option, because it will have to scan every row in the table.
Therefore, the index on occupation and then scan the rows from the index for gender and age will give the best performance.
Here is a table that summarizes the performance of each option:
Option Performance
Index on occupation and then scan the rows from the index for gender and age Best
Index code on gender and then scan the rows from the index for age and occupation Less efficient
Linear scan of the table Least efficient
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Demonstrate understanding of what neural networks are and the mathematical explanation of their algorithms. Please send for me video links so I have a better understanding.
Neural networks are computational models inspired by the human brain.
How is this so?They consist of interconnected layers of artificial neurons that process information.
The mathematical explanation of their algorithms involves calculating weighted sums of inputs, applying activation functions to produce outputs, and iteratively adjusting the weights through backpropagation.
This process optimizes the network's ability to learn patterns and make predictions, allowing it to solve complex tasks such as image recognition or natural language processing.
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Expert Q&A Done MUST BE DONE IN VISUAL STUDIO! I only need the administrative model completed :) Winter 1. School Resistration System You may bed w LS B. Administrative module a. Statistics i. For example, total students in a course, etc. b. Manage records i. Sorting ii. Filtering iii. Edit iv. Delete V. Add vi. etc. c. View record(s) d. etc.
The administrative module of the School Registration System in Visual Studio needs to include features such as statistics, record management (sorting, filtering, editing, deleting, adding), and the ability to view records.
This module will provide administrative functionalities for managing student data and performing various operations on it.
To develop the administrative module of the School Registration System in Visual Studio, you will need to design and implement several features.
Statistics: This feature will allow administrators to retrieve statistical information about the system. For example, they can generate reports on the total number of students enrolled in a specific course or program, track enrollment trends, or analyze demographic data. The statistics feature will provide valuable insights for decision-making and planning.
Manage Records: This feature includes various operations to manage student records. It should provide functionality for sorting records based on different criteria, allowing administrators to organize data in a meaningful way. Filtering capabilities will enable administrators to narrow down the records based on specific parameters, such as course, grade level, or student status. The module should also support editing records to update information, deleting records when necessary, and adding new records to the system.
View Record(s): This feature allows administrators to view individual student records or a group of records based on specified criteria. Administrators should be able to search for a particular student's record using their name, student ID, or other identifying information. The view record(s) feature ensures easy access to student details for administrative purposes.
By incorporating these features into the administrative module of the School Registration System in Visual Studio, administrators will have the necessary tools to efficiently manage student data, analyze statistics, perform record management tasks, and view student records as needed.
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- Create a minimum of three test cases for the GetElement method.
- Create a minimum of three test cases for the Contains method.
- Create a minimum of three test cases for the RemoveElementAt method.
- Create a minimum of three test cases for the addFront method.
- Create a minimum of three test cases for the ToString method.
Test cases are essential in programming as they provide a systematic approach to verifying, detecting errors, and ensuring the reliability and correctness of software. They improve code quality, enable collaboration, and support the overall development and maintenance process.
Test cases for the Get Element method:
Test case 1: When the index value is less than zero
Test case 2: When the index value is equal to zero
Test case 3: When the index value is greater than the number of elements in the list
Test cases for the Contains method:
Test case 1: When the element is present in the list
Test case 2: When the element is not present in the list
Test case 3: When the list is empty
Test cases for the Remove Element At method:
Test case 1: When the index value is less than zero
Test case 2: When the index value is equal to zero
Test case 3: When the index value is greater than the number of elements in the list
Test cases for the add Front method:
Test case 1: When the list is empty
Test case 2: When the list has some elements
Test case 3: When the list is already full
Test cases for the To String method:
Test case 1: When the list is empty
Test case 2: When the list has only one element
Test case 3: When the list has multiple elements
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C++ code please
Create a 2D array of size m x n where m is the number of employees working and n is the
number of weekdays (mon – fri). Populate the array with the hours the employees have worked
for 1 week (random values between 5 and 10).
a) Your program must display the contents of the array
b) Create a function highestHours() that finds the employee that has worked the most in the
week and display it’s index.
Here's the C++ code that creates a 2D array, populates it with random values, displays the array contents, and finds the employee that has worked the most hours in a week:
#include <iostream>
#include <cstdlib>
#include <ctime>
const int MAX_EMPLOYEES = 100; // Maximum number of employees
const int MAX_WEEKDAYS = 5; // Number of weekdays (mon - fri)
void displayArray(int arr[][MAX_WEEKDAYS], int m, int n) {
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
std::cout << arr[i][j] << " ";
}
std::cout << std::endl;
}
}
int highestHours(int arr[][MAX_WEEKDAYS], int m, int n) {
int maxHours = 0;
int maxEmployeeIndex = 0;
for (int i = 0; i < m; i++) {
int totalHours = 0;
for (int j = 0; j < n; j++) {
totalHours += arr[i][j];
}
if (totalHours > maxHours) {
maxHours = totalHours;
maxEmployeeIndex = i;
}
}
return maxEmployeeIndex;
}
int main() {
int m, n;
std::cout << "Enter the number of employees: ";
std::cin >> m;
std::cout << "Enter the number of weekdays: ";
std::cin >> n;
// Create a 2D array
int hoursArray[MAX_EMPLOYEES][MAX_WEEKDAYS];
// Seed the random number generator
srand(time(0));
// Populate the array with random values between 5 and 10
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
hoursArray[i][j] = rand() % 6 + 5;
}
}
// Display the array contents
std::cout << "Array Contents:" << std::endl;
displayArray(hoursArray, m, n);
// Find the employee with the highest hours
int maxEmployeeIndex = highestHours(hoursArray, m, n);
std::cout << "Employee with the highest hours: " << maxEmployeeIndex << std::endl;
return 0;
}
This code prompts the user to enter the number of employees and weekdays, creates a 2D array based on the input, populates it with random values between 5 and 10, displays the array contents, and finds the employee with the highest hours using the highestHours() function.
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We have five processes A through E, arrive at the system at the same time. They have estimated running times of 10, 6, 2, 4, and 8. If the context switch overhead is 0, what is the average waiting time for longest job first scheduling (the running process with the longest estimated running time will be scheduled first)? O a. 16 O b. 17 O c. 18 O d. 16.5
The average waiting time for longest job first scheduling is 16. So, the correct option is (a) 16.
To calculate the average waiting time for longest job first scheduling, we need to consider the waiting time for each process.
Given processes A through E with estimated running times of 10, 6, 2, 4, and 8, respectively, and assuming they arrive at the system at the same time, let's calculate the waiting time for each process using longest job first scheduling:
Process A (10 units): Since it is the longest job, it will start immediately. So, its waiting time is 0.
Process E (8 units): It will start after process A completes. So, its waiting time is 10 (the running time of process A).
Process B (6 units): It will start after process E completes. So, its waiting time is 10 + 8 = 18.
Process D (4 units): It will start after process B completes. So, its waiting time is 10 + 8 + 6 = 24.
Process C (2 units): It will start after process D completes. So, its waiting time is 10 + 8 + 6 + 4 = 28.
To calculate the average waiting time, we sum up all the waiting times and divide by the number of processes:
Average waiting time = (0 + 10 + 18 + 24 + 28) / 5 = 16
Therefore, the average waiting time for longest job first scheduling is 16. So, the correct option is (a) 16.
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Suppose memory has 256KB, OS use low address 20KB, there is one program sequence: (20) Progl request 80KB, prog2 request 16KB, Prog3 request 140KB Prog1 finish, Prog3 finish; Prog4 request 80KB, Prog5 request 120kb Use first match and best match to deal with this sequence (from high address when allocated) (1)Draw allocation state when prog1,2,3 are loaded into memory? (5) (2)Draw allocation state when prog1, 3 finish? (5) . (3)use these two algorithms to draw the structure of free queue after progl, 3 finish(draw the allocation descriptor information,) (5) (4) Which algorithm is suitable for this sequence ? Describe the allocation process? (5)
1. Prog1, Prog2, and Prog3 are loaded in memory.
2. Prog1 and Prog3 finish.
3. Free queue structure after Prog1 and Prog3 finish.
4. Best Match algorithm is suitable.
How is this so?1. Draw allocation state when Prog1, Prog2, and Prog3 are loaded into memory -
--------------------------------------------------------------
| Prog3 (140KB) |
--------------------------------------------------------------
| Prog2 (16KB) |
--------------------------------------------------------------
| Prog1 (80KB) |
--------------------------------------------------------------
| Free Memory (20KB - 20KB) |
--------------------------------------------------------------
2. Draw allocation state when Prog1 and Prog3 finish -
--------------------------------------------------------------
| Prog4 (80KB) |
--------------------------------------------------------------
| Prog5 (120KB) |
--------------------------------------------------------------
| Free Memory (16KB - 80KB) |
--------------------------------------------------------------
3. Structure of free queue after Prog1 and Prog3 finish using the first match and best match algorithms -
First Match -
--------------------------------------------------------------
| Free (16KB - 80KB) |
--------------------------------------------------------------
Best Match -
--------------------------------------------------------------
| Free (16KB - 20KB) |
--------------------------------------------------------------
Allocation Descriptor Information -
- First Match - Contains the starting address and size of the free block.
- Best Match - Contains the starting address, size, and fragmentation level of the free block.
4. Based on the given sequence, the Best Match algorithm is suitable. The allocation process involves searching for the free block with the closest size match to the requested size.
This helps minimize fragmentation and efficiently utilizes the available memory.
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Translate the following RISC-V instructions to machine code and assume that the program is stored in memory starting at address 0. Address: 0 4 8 12 16 LOOP: beq x6, x0, DONE addi x6, x6, -1 addi x5, x5, 2 jal x0, LOOP DONE:
To translate the given RISC-V instructions to machine code, we need to convert each instruction into its binary representation based on the RISC-V instruction encoding format. Here's the translation:
Address: 0 4 8 12 16
Instruction: beq x6, x0, DONE
Machine Code: 0000000 00000 000 00110 000 00000 1100011
Address: 0 4 8 12 16
Instruction: addi x6, x6, -1
Machine Code: 1111111 11111 001 00110 000 00000 0010011
Address: 0 4 8 12 16
Instruction: addi x5, x5, 2
Machine Code: 0000000 00010 010 00101 000 00000 0010011
Address: 0 4 8 12 16
Instruction: jal x0, LOOP
Machine Code: 0000000 00000 000 00000 110 00000 1101111
Address: 0 4 8 12 16
Instruction: DONE:
Machine Code: <No machine code needed for label>
Note: In the machine code representation, each field represents a different part of the instruction (e.g., opcode, source/destination registers, immediate value, etc.). The actual machine code may be longer than the provided 7-bit and 12-bit fields for opcode and immediate value, respectively, as it depends on the specific RISC-V instruction encoding format being used.
Please keep in mind that the provided translations are based on a simplified representation of RISC-V instructions, and in practice, additional encoding rules and considerations may apply depending on the specific RISC-V architecture and instruction set version being used.
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Write a method that sum all the even numbers of a given one-dimensional array, print out the array, the sum, and the count of the even numbers.
The sum_even_numbers method takes in a one-dimensional array and iterates through each element. For each even number in the array, it is appended to a new list called even_nums and its value is added to the variable total.
At the end of the iteration, the method prints out the original array, the even_nums list containing all the even numbers found, the sum of those even numbers stored in total, and the count of even numbers found using the built-in len() function.
In more detail, the method checks each element in the array to see if it is even by using the modulo operator (%) which checks if the remainder of dividing the number by 2 is 0. If the remainder is 0, the number is added to the even_nums list and its value is added to total. Once all elements have been checked, the method prints out the original array, the even number list, the total sum of even numbers, and the count of even numbers.
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6. Outline any five payment systems usable in e-commerce (10 marks) 7. How does EDI work in e- Banking? (10 marks) 8. What are the stages involved in developing an e-commerce website? (10 marks)
The given line of Visual Basic code sets the height of a textbox control (txtName) equal to the width of an image control (picBook).
In Visual Basic, the properties of controls can be manipulated to modify their appearance and behavior. In this specific line of code, the height property of the textbox control (txtName.Height) is being assigned a value. That value is determined by the width property of the image control (picBook.Width). By setting the height of the textbox control equal to the width of the image control, the two controls can be aligned or adjusted in a way that maintains a proportional relationship between their dimensions.
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Table: Technical Information on the following Encryption Methods
Encryption Method Description Usage Products Available Algorithm Block Size Keys/Subkeys Usage/Size Number of Rounds Round Function Operations for Transforming Plaintext to Ciphertext Speed and Algorithm for Encryption/Decryption Plaintext Size Strengths Weaknesses Random/ Pseudorandom Number Usage Ease of Analysis/
Cryptanalysis Standards Organization Involvement/ Inventor Other Pertinent Information
Symmetric Asymmetric Data Encryption Standard block cipher stream cipher Advanced Encryption Standard Data Encryption Standard hash functions
I can provide you with the technical information on each of the encryption methods you have mentioned:
Symmetric Encryption:
Description: This encryption method uses a single key for both encryption and decryption of data. The same key is applied to encrypt the plaintext to ciphertext and to decrypt the ciphertext back to plaintext.
Usage: It is widely used in securing communication channels such as internet traffic, secure messaging, and file encryption.
Products Available: Various symmetric encryption algorithms are available, including DES, AES, Blowfish, and Twofish.
Algorithm Block Size: The block size varies depending on the algorithm used. For example, the block size for DES is 64 bits, while the block size for AES ranges from 128 to 256 bits.
Keys/Subkeys Usage/Size: The key size also varies according to the algorithm, ranging from 56 bits for DES to 256 bits for AES.
Usage/Size Number of Rounds: The number of rounds also varies from algorithm to algorithm. For instance, DES uses 16 rounds, while AES can use up to 14 rounds.
Round Function Operations for Transforming Plaintext to Ciphertext: Each round involves several operations such as substitution, permutation, and/or mixing of data.
Speed and Algorithm for Encryption/Decryption: Symmetric encryption is generally faster than asymmetric encryption. The most commonly used algorithm for encryption/decryption is AES.
Plaintext Size: The plaintext size that can be encrypted depends on the algorithm and block size used.
Strengths: Symmetric encryption is fast, simple, and efficient. It provides confidentiality and integrity of data.
Weaknesses: The main weakness of symmetric encryption is the need for a secure distribution of the key between sender and receiver.
Random/Pseudorandom Number Usage: Random numbers may be used in the key generation process.
Ease of Analysis/Cryptanalysis: Symmetric encryption is vulnerable to brute-force attacks if the key size is too small.
Standards Organization Involvement/Inventor: The National Institute of Standards and Technology (NIST) developed standard encryption algorithms, including DES and AES.
Asymmetric Encryption:
Description: This encryption method uses two different keys, one for encryption and another for decryption. The public key is used for encryption, while the private key is used for decryption.
Usage: It is commonly used in secure online communication, digital signatures, and authentication.
Products Available: Various asymmetric encryption algorithms are available, including RSA, Diffie-Hellman, and Elliptic Curve Cryptography (ECC).
Algorithm Block Size: Unlike symmetric encryption, there is no fixed block size for asymmetric encryption.
Keys/Subkeys Usage/Size: The key size is generally larger than symmetric encryption algorithms, ranging from 1024 bits to 4096 bits.
Usage/Size Number of Rounds: Asymmetric encryption does not involve rounds like symmetric encryption.
Round Function Operations for Transforming Plaintext to Ciphertext: Asymmetric encryption involves mathematical functions such as modular exponentiation, prime factorization, and discrete logarithms.
Speed and Algorithm for Encryption/Decryption: Asymmetric encryption is slower than symmetric encryption. The most commonly used algorithm for encryption/decryption is RSA.
Plaintext Size: Asymmetric encryption can handle large plaintext sizes.
Strengths: Asymmetric encryption provides confidentiality, integrity, and authenticity of data, and eliminates the need for secure key distribution.
Weaknesses: The main weakness of asymmetric encryption is its slow speed and large key size requirements.
Random/Pseudorandom Number Usage: Random numbers may be used in the key generation process.
Ease of Analysis/Cryptanalysis: Asymmetric encryption is resistant to brute-force attacks due to the large key size.
Standards Organization Involvement/Inventor: RSA was invented by Ron Rivest, Adi Shamir, and Leonard Adleman in 1977.
Data Encryption Standard (DES):
Description: It is a symmetric block cipher encryption algorithm that uses a 56-bit key to encrypt and decrypt data.
Usage: It was widely used in the past for secure communication but has been replaced by stronger algorithms like AES.
Products Available: DES has been replaced by advanced encryption standards like AES.
Algorithm Block Size: The block size is 64 bits.
Keys/Subkeys Usage/Size: The key size is 56 bits.
Usage/Size Number of Rounds: It uses 16 rounds.
Round Function Operations for Transforming Plaintext to Ciphertext: Each round involves substitution, permutation, and/or mixing of data.
Speed and Algorithm for Encryption/Decryption: DES is slower than modern encryption algorithms, and hardware implementation can make it faster.
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Explain 2 different techniques attackers might use to hide their identity/address while attacking systems. How can those techniques be (a) detected, (b) stopped, and (c) defeated (e.g, discovering the attackers’ real identity/address)?
Attackers can hide their identity/address through techniques like IP spoofing and proxy servers.
These can be detected through network analysis, prevention methods include filtering and authentication, and defeating them may involve forensic analysis and collaboration with ISPs or law enforcement.
1. IP Spoofing: Attackers can use IP spoofing to hide their true IP address and make it appear as if the attack is originating from a different IP address. They forge the source IP address in the packets they send, making it difficult to trace the attack back to its actual source.
(a) Detection: IP spoofing can be detected through various techniques such as analyzing network traffic patterns, monitoring for inconsistencies in packet headers, and employing intrusion detection systems (IDS) that can detect spoofed IP addresses.
(b) Prevention: To prevent IP spoofing attacks, network administrators can implement ingress and egress filtering at network borders to verify the legitimacy of the source IP addresses. Additionally, implementing strong authentication mechanisms can help prevent unauthorized access to systems.
(c) Defeat: To defeat IP spoofing attacks and discover the attackers' real identity/address, forensic analysis can be performed on network logs, examining packet headers, and collaborating with internet service providers (ISPs) to trace the origin of the spoofed packets.
2. Proxy Servers: Attackers can use proxy servers to hide their identity and route their attacks through intermediate servers. By leveraging anonymous proxy servers or networks such as Tor, attackers can obfuscate their true IP address and make it challenging to identify their location.
(a) Detection: Detecting attackers using proxy servers requires monitoring network traffic for suspicious patterns, analyzing the source and destination IP addresses, and employing techniques like traffic analysis and correlation to identify anomalies.
(b) Prevention: Network administrators can implement measures such as access control lists (ACLs) and firewalls to block known proxy servers and anonymization networks. Intrusion prevention systems (IPS) and behavioral analysis techniques can also help identify malicious activities associated with proxy server usage.
(c) Defeat: Defeating attackers using proxy servers requires comprehensive investigation and analysis. This can involve cooperation with law enforcement agencies, collaboration with proxy service providers to identify the real IP addresses behind the proxies, and utilizing advanced forensic techniques to gather evidence and trace the attacks back to their source.
It's important to note that the effectiveness of detection, prevention, and defeat techniques can vary depending on the sophistication of the attackers and the specific circumstances of the attack.
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Q-1 Write block of code to display if a year entered by the user is a leap year or not.
Q-2 Write code to display a menu for the user who is visiting a mechanic shop. Menu should have three services and assign a price for each. Ask the user what service they want and give them a total based on services they selected. Ask if they need more services, end the program if user writes "end"
Q-3 ] Is it possible to sort elements of an array? If yes, write a practical reason sorting array elements may be helpful in a program.
Language needed is C
Yes, it is possible to sort elements of an array in C. Sorting helps in organizing data and enables efficient searching and retrieval in programs.
Q-1: To determine if a year entered by the user is a leap year or not in C, you can use the following code:
c
Copy code
#include <stdio.h>
int main() {
int year;
printf("Enter a year: ");
scanf("%d", &year);
if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) {
printf("%d is a leap year.\n", year);
} else {
printf("%d is not a leap year.\n", year);
}
return 0;
}
Q-2: Here's a code snippet that displays a menu for a mechanic shop and calculates the total based on the selected services:
c
Copy code
#include <stdio.h>
int main() {
float oilChangePrice = 30.0;
float tireRotationPrice = 20.0;
float brakeServicePrice = 50.0;
float total = 0.0;
char choice;
printf("Welcome to the mechanic shop!\n");
printf("Menu:\n");
printf("1. Oil Change - $%.2f\n", oilChangePrice);
printf("2. Tire Rotation - $%.2f\n", tireRotationPrice);
printf("3. Brake Service - $%.2f\n", brakeServicePrice);
do {
printf("Enter your choice (1-3) or 'end' to finish: ");
scanf(" %c", &choice);
switch (choice) {
case '1':
total += oilChangePrice;
break;
case '2':
total += tireRotationPrice;
break;
case '3':
total += brakeServicePrice;
break;
case 'e':
case 'E':
printf("Thank you for using our services!\n");
return 0;
default:
printf("Invalid choice. Please try again.\n");
break;
}
} while (choice != 'end');
printf("Total: $%.2f\n", total);
return 0;
}
Q-3: Yes, it is possible to sort elements of an array in C. Sorting the elements in an array can be helpful in various programs. One practical reason is to arrange the elements in ascending or descending order to facilitate efficient searching and retrieval. For example, if you have a large list of names, sorting them alphabetically can make it easier to locate a specific name using binary search. Sorting can also be useful in organizing numerical data, such as scores or grades, to identify the highest or lowest values.
Sorting arrays is a fundamental operation in computer science and can improve the efficiency of various algorithms. It enables you to perform tasks like finding the median, detecting duplicates, or identifying patterns in the data. Additionally, sorting is often a prerequisite for other operations like merging two sorted arrays or implementing efficient search algorithms like binary search. Overall, sorting arrays provides a foundation for data manipulation and analysis in many programs.
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what type of data structure associates items together?
A. binary code
B. dictionary
C. interface
D. editor
The type of data structure associates items together is dictionary.
A dictionary, additionally known as a map or associative array, is the structure of a record that shops statistics in key-price pairs. It permits green retrieval and manipulation of data by associating a unique key with each price.
In a dictionary, the key serves as the identifier or label for a selected price. This key-cost affiliation permits brief get admission to values based on their corresponding keys. Just like an actual-international dictionary, where phrases (keys) are related to their definitions (values), a dictionary data shape allows you to appearance up values with the aid of their associated keys.
The gain of using a dictionary is that it affords rapid retrieval and green searching of facts, as it makes use of a hashing or indexing mechanism internally. This makes dictionaries suitable for eventualities wherein you need to quickly get admission to or replace values based on their unique identifiers.
Therefore, whilst you want to associate items collectively and retrieve them using their corresponding keys, a dictionary is the right facts structure to apply.
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With UDP sockets, a client socket can only be closed after the server closed its own socket. O True O False
False. With UDP sockets, a client socket can only be closed after the server closed its own socket.
UDP socket routines enable simple IP communication using the user datagram protocol (UDP). The User Datagram Protocol (UDP) runs on top of the Internet Protocol (IP) and was developed for application that do not require reliability, acknowledgement, or flow control features at the transport layer.
With UDP sockets, each socket (client or server) operates independently and can be closed at any time without relying on the other party. UDP is a connectionless protocol, and each UDP packet is independent of others. Therefore, a client socket can be closed without waiting for the server to close its socket, and vice versa.
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Let A[1..n] be an array of n positive numbers. Entry A[i] represents the trading price of a stock X on the i-th day (and hence the numbers are ordered chronologically). Write an algorithm max-profit that returns a pair (a, b) such that if one buys stock X on the a-th day and sells it on the b-th day, the maximum profit is made. Give the time complexity of your algorithm in Big-0. Show the derivation of the complexity result.
The algorithm "max-profit" finds the optimal pair of buy and sell days to maximize profit in a given array of stock prices. Its time complexity is O(n), where n is the number of days, as it iterates through the array once to identify the minimum buy day and the maximum sell day.
The "max-profit" algorithm iterates through the array of stock prices, keeping track of the minimum price encountered so far and the maximum profit that can be obtained. It starts with initializing the minimum price as the first element and the maximum profit as 0. Then, for each subsequent day, it checks if the current price is lower than the minimum price. If it is, the minimum price is updated. Otherwise, it calculates the profit by subtracting the minimum price from the current price and compares it with the maximum profit. If the profit is higher, the maximum profit is updated.
Since the algorithm iterates through the array once, its time complexity is linearly dependent on the number of days, resulting in O(n) complexity. The algorithm has a constant number of operations for each day, including comparisons and updates. Therefore, the total number of operations scales linearly with the input size, which is n in this case.
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Explain what minimum spanning tree means.
A minimum spanning tree (MST) is a concept in graph theory and computer science that refers to a tree-like subgraph of a connected, undirected graph. The minimum spanning tree includes all the vertices of the original graph while minimizing the total sum of the edge weights.
In other words, given a connected graph with a set of vertices and edges, a minimum spanning tree is a subset of those edges that forms a tree and connects all the vertices with the minimum possible total weight. The weight of an edge can represent various factors, such as distance, cost, or any other relevant metric associated with the edges.
The key characteristics of a minimum spanning tree are as follows:
It spans all the vertices of the original graph, meaning it connects all the vertices together without forming cycles.
It is a tree, meaning it is a connected acyclic graph. This ensures that there are no redundant or unnecessary edges.
It has the minimum possible total weight among all the spanning trees that can be formed from the original graph. This implies that there is no other spanning tree with a smaller total weight.
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C language _______ modifier can be used to make the variable to retain its value between code block invocations.
The do-while statement in C is an example of a/an ___ construct.
____ testing tests based on the underlying code and the test cases are certain to reach all sections of the code.
Every recursion of a function creates a new ________ record.
A linked list is a collection of records linked by ___.
The C language "static" modifier can be used to make a variable retain its value between code block invocations. It allows the variable to maintain its value even when the block of code in which it is defined is exited.
1. The do-while statement in C is an example of a loop construct. It is similar to the while loop but with a slight difference: the condition is checked after the execution of the loop body. This ensures that the loop body is executed at least once, even if the condition is initially false.
2. White-box testing, also known as structural testing, is a testing technique that focuses on testing based on the underlying code structure. It involves designing test cases that exercise all sections of the code, including loops, conditional statements, and branches. This type of testing guarantees that every line of code is executed at least once.
3. Every recursion of a function creates a new activation record, also known as a stack frame. An activation record contains information about the function's execution state, including local variables, parameters, return addresses, and other necessary data. These activation records are stacked on top of each other in memory, forming a call stack.
4. A linked list is a data structure consisting of a collection of nodes, where each node contains a value and a reference (or link) to the next node in the sequence. This linking of nodes allows for dynamic memory allocation and efficient insertion and deletion operations. The nodes in a linked list are not necessarily stored in contiguous memory locations, unlike arrays.
5. In summary, the "static" modifier in C allows a variable to retain its value between code block invocations. The do-while statement is a loop construct that ensures the loop body is executed at least once. White-box testing focuses on testing all sections of the code based on its structure. Recursion in a function creates new activation records, and a linked list is a collection of nodes connected by references.
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Write a Java program called DisplayText that includes a String array called names [] containing the following elements, (Jane, John, Tim, Bob, Mickey). Display the contents of the String array in the command line window.
The Java program "DisplayText" uses a String array called "names[]" to store names. It then displays the contents of the array in the command line window.
public class DisplayText {
public static void main(String[] args) {
String[] names = {"Jane", "John", "Tim", "Bob", "Mickey"};
// Display the contents of the names array
for (String name : names) {
System.out.println(name);
}
}
}
When you run this program, it will print each element of the "names" array on a separate line in the command line window.
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5. Given R=(0*10+)*(1 U €) and S =(1*01+)* a) Give an example of a string that is neither in the language of R nor in S. [2marks] b) Give an example of a string that is in the language of S but not R. [2 marks] c) Give an example of a string that is in the language of R but not S. [2 marks] d) Give an example of a string that is in the language of Rand S. [2 marks] e) Design a regular expression that accepts the language of all binary strings with no occurrences of 010 [4 marks]
a) "0110" is not in in the language of R or S. b) "1001" is in S but not R. c) "010" is in R but not S. d) "101" is in R and S. e) RegEx: (0+1)*1*(0+ε) accepts strings without "010".
a) An example of a string that is neither in the language of R nor in S is "0110". This string does not match the pattern of R because it contains "01" followed by "10", which violates the pattern requirement. Similarly, it does not match the pattern of S because it contains "01" followed by "10", which again violates the pattern requirement.
b) An example of a string that is in the language of S but not R is "1001". This string matches the pattern of S as it consists of "1" followed by any number of occurrences of "01", ending with "1". However, it does not match the pattern of R because it does not start with "0" followed by any number of occurrences of "10".
c) An example of a string that is in the language of R but not S is "010". This string matches the pattern of R as it starts with "0" followed by any number of occurrences of "10" and optionally ends with "1". However, it does not match the pattern of S because it does not start with "1" followed by any number of occurrences of "01" and ending with "1".
d) An example of a string that is in the language of R and S is "101". This string matches the pattern of both R and S as it starts with "1" followed by any number of occurrences of "01" and ends with "1".
e) The regular expression that accepts the language of all binary strings with no occurrences of "010" can be expressed as: (0+1)*1*(0+ε) where ε represents an empty string.
This regular expression allows any number of occurrences of "0" or "1", with the condition that "1" appears at least once, and the last character is either "0" or empty. This expression ensures that there are no instances of "010" in the string, satisfying the given condition.
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Assignment 2 Submission Date: June 20, 2022 Time:511:59 Pm 1. Prompt the user to enter a number between 5 and 40 inclusive and print the entered number on the screen. If the number is outside the above range, print "out of range". Assumption: User will not enter any non-integer data. 2. Using for loop find the max and min numbers from 5 entered numbers. Hint. Int min, number, I, max; System.out.print ("Enter integerl:") Number=input.nextInt (); Min=number; Max=number;
In programming, we need to use many control structures, and the for loop is one of them. The for loop is used for looping or repeating a particular block of code for a particular number of times. It is used when we know the range or the number of iterations required to run the loop.
The program can be implemented in Java language as follows:
import java.util.Scanner;
class Main {public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter a number between 5 and 40: ");
int num = input.nextInt();if (num >= 5 && num <= 40) {
System.out.println("The entered number is " + num);
for (int i = 1; i <= 5; i++) {
System.out.print("Enter integer " + i + ": ");
int number = input.nextInt();
if (number < min) {min = number;}
if (number > max) {max = number;}
System.out.println("Minimum number: " + min);
System.out.println("Maximum number: " + max);}
else {System.out.println("Out of range");}
input.close();}
In conclusion, we can use the for loop to find the minimum and maximum numbers out of 5 entered numbers. We can also prompt the user to enter a number between 5 and 40, and if the number is out of range, we can display an error message.
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In a
file create randomly generated but unique floating point values
from range -100,000 to 100,000, do this in a project, through an
online utility, or whatever you find most convenient
Create
in C++
The C++ program generates a file containing randomly generated unique floating-point values within the range of -100,000 to 100,000. The program utilizes C++ random number generation functions to achieve this.
To create the randomly generated unique floating-point values in C++, we can follow these steps:
1. Include the necessary header files in the C++ program, such as `<iostream>` for input/output operations and `<fstream>` for file handling.
2. Define the range for the floating-point values, which is -100,000 to 100,000 in this case.
3. Create a set container to store the generated values. The set container ensures uniqueness by automatically discarding duplicate values.
4. Use a loop to generate random floating-point values within the specified range. For each generated value, check if it already exists in the set. If not, add it to the set.
5. Once the desired number of unique values is generated (e.g., by checking the size of the set), open a file using an output file stream (`std::ofstream`).
6. Iterate over the set of unique values and write each value to the file using the output file stream.
7. Close the file after writing all the values.
8. The program execution is complete, and the file now contains the randomly generated unique floating-point values.
By following these steps, the C++ program successfully generates a file with randomly generated unique floating-point values within the specified range.
Note: It's important to use appropriate random number generation techniques and ensure the uniqueness of values to achieve the desired results.
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Question: Data warehouse (DW) is defined as a collection of integrated, subject-oriented databases designed to support DSS functions. Identify and briefly discuss four (4) characteristics of DW s and provide examples. Instructions for answering this question: The answer to this question is required as
Data Warehouse (DW) is a relational database that contains current and historical data extracted from multiple databases and then integrated for easy analysis. It is a comprehensive, up-to-date, and consolidated data repository that is used to support business decisions.
A data warehouse is a collection of integrated, subject-oriented databases designed to support DSS functions. In a data warehouse, data is extracted, transformed, and loaded from a variety of sources, including transactional databases, external data sources, and other data warehouses. DWs are used to support decision-making and analytics.
Integrated: Data Warehouse (DW) combines data from a variety of sources, such as operational systems and external data sources, to generate an integrated view of the organization. For example, a DW can combine data from various sources, such as sales, inventory, and customer data.Subject-Oriented: Data Warehouse (DW) organizes data around subjects, such as customers, products, and sales, rather than around the applications that create the data. For example, a DW might have data marts that contain data on customers, products, and sales.Time-Variant: Data Warehouse (DW) stores historical data in addition to current data. The ability to view historical data is a key feature of a DW. For example, a DW can store data on customer purchases for several years.Non-Volatile: Data Warehouse (DW) is read-only, meaning that data is not updated or deleted once it is loaded into the data warehouse. Users can access historical data, and data is not deleted or changed.Data warehouse is a valuable tool for organizations that want to use their data to gain insights and support decision-making. It is designed to integrate data from multiple sources, organize it around subjects, store historical data, and provide a read-only view of data. Data warehouse (DW) is critical for business intelligence and analytics.
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Please write C++ functions, class and methods to answer the following question.
Define a new C++ class named "Word" that manages a dictionary word (string)
and its definition (string).
The class must provide at least the following two methods:
• toString method that returns the string containing all the information about
the dictionary word in the following format:
WORD() DEFINITION()
For example, here is a specific word:
WORD(School) DEFINITION(An educational institution)
WORD(Computer) DEFINITION(An electronic device)
• isTheSameWord method that compares the information between 2 Word
objects and return true if they have the same word and false otherwise.
• "find" method that accepts a search string and return true if the word or the
definition contains that search string.
Note: you can add as many other methods as you need.
Show how this class is being used and tested.
In this example, we create two Word objects: word1 and word2 with different word and definition pairs. We then call the toString() method to display the information about each word.
Here is an implementation of the "Word" class in C++ with the provided methods:
cpp
Copy code
#include <iostream>
#include <string>
class Word {
private:
std::string word;
std::string definition;
public:
Word(const std::string& word, const std::string& definition) : word(word), definition(definition) {}
std::string toString() const {
return "WORD(" + word + ") DEFINITION(" + definition + ")";
}
bool isTheSameWord(const Word& other) const {
return word == other.word;
}
bool find(const std::string& searchString) const {
return word.find(searchString) != std::string::npos || definition.find(searchString) != std::string::npos;
}
};
The "Word" class manages a dictionary word and its definition using two private member variables: word and definition. The constructor initializes these variables.
The toString() method returns a formatted string containing the word and its definition.
The isTheSameWord() method compares two Word objects to check if they have the same word.
The find() method accepts a search string and checks if either the word or the definition contains that search string. It returns true if found, and false otherwise.
To test and use the class, we can create instances of the Word class, invoke the methods, and observe the results. Here's an example usage:
cpp
Copy code
int main() {
Word word1("School", "An educational institution");
Word word2("Computer", "An electronic device");
std::cout << word1.toString() << std::endl;
std::cout << word2.toString() << std::endl;
if (word1.isTheSameWord(word2)) {
std::cout << "The words are the same." << std::endl;
} else {
std::cout << "The words are different." << std::endl;
}
std::string searchString = "edu";
if (word1.find(searchString)) {
std::cout << "The search string was found in word1." << std::endl;
} else {
std::cout << "The search string was not found in word1." << std::endl;
}
return 0;
}
In this example, we create two Word objects: word1 and word2 with different word and definition pairs. We then call the toString() method to display the information about each word. Next, we use the isTheSameWord() method to compare the two words. Finally, we use the find() method to search for a specific string within word1 and display the result.
By using the Word class, we can manage dictionary words and their definitions more effectively and perform operations such as string representation, comparison, and searching.
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Repetition
For this question the task is to complete the method wonder(number) which takes a single positive int as a parameter (you do no need to check the input, all tested inputs will be positive integers). The method should then repeatedly apply the following function:
\mathrm{wonder}(x) = \left\{\begin{array}{ll}3x + 1 & \text{if } x \text{ is odd.}\\x/2 & \text{if } x \text{ is even.}\end{array}\right.wonder(x)={3x+1x/2if x is odd.if x is even.
It should record the result of each step in a list. It should stop once the result value is 1. It should then return the list. The initial and final value should be in the list.
For example, the input 5 should give the result [5, 16, 8, 4, 2, 1].
Only the wonder method will be tested. There is a main section that you can use for your own testing purposes. Be careful with the division, you want to make sure you're producing ints at every step.
Wonder.py
def wonder(number):
# Your code goes here.
# You probably want to change the return too.
return []
if __name__ == '__main__':
# You can add anything you like
# here as long as it still runs.
pass
The task is to complete the "wonder" method in Python, which takes a positive integer as input. The method should apply a specific function repeatedly to the input until it reaches 1, recording each step in a list.
The function multiplies odd numbers by 3 and adds 1, while it divides even numbers by 2. The list should include both the initial and final values. The given problem requires implementing the "wonder" method in Python. This method takes a positive integer as input and applies a specific function repeatedly until it reaches 1, recording each step in a list. The function, as defined, multiplies odd numbers by 3 and adds 1, while it divides even numbers by 2. The list should include both the initial value and the final value of 1.
To solve this problem, we can initialize an empty list to store the result. We start by appending the initial number to the list. Then, we enter a loop that continues until the number becomes 1. Inside the loop, we check if the number is odd or even. If it is odd, we multiply it by 3 and add 1, and if it is even, we divide it by 2. We update the number with the new value and append it to the list. This process continues until the number becomes 1.
Once the loop terminates, we have recorded all the intermediate values in the list, including the initial and final values. Finally, we return the list as the result of the "wonder" method. The implementation of the "wonder" method will involve utilizing control structures such as loops and conditionals to perform the necessary calculations and list operations. The code should ensure that the input is a positive integer and handle each step of the "wonder" function correctly.
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In the Hi-Lo game, the player picks either Hi or Lo. A random number between and including 1-13 is picked. If the player picked Lo, they win if the number generated is between and including 1-6. If the player picked Hi, they win if the number generated is between and including 8-13. The player loses if the number generated is in the opposite range. The player does not win or lose if the number picked is 7. Given a seed and the range the player picked, determine if they win the game. The random number should be generated using the java.util.Random class.
Methods
Your program should define and implement the following methods:
A getResult method that takes the following parameters:
An int representing the random number generated.
A String representing the range picked by the player. The value of this String should always be Hi or Lo.
The method should return an int representing the result of the game. Return 1 if the player won, -1 if the player lost or 0 if the number picked was 7.
Input Specification
The first line of input is an integer that will fit in a 64 bit signed integer region of memory.
The next line is either the string Hi or Lo representing the range picked by the player.
Output Specification
Create and call the method outlined above and print 1, -1 or 0 representing the result of the game.
Sample Input
298471298552
Hi
Sample Output
1
// use java to solve it
Here's a Java code that solves the problem:
java
import java.util.Random;
import java.util.Scanner;
public class HiLoGame {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
long seed = sc.nextLong();
String range = sc.next();
Random rand = new Random(seed);
int num = rand.nextInt(13) + 1;
int result = getResult(num, range);
System.out.println(result);
}
public static int getResult(int num, String range) {
if (num == 7) {
return 0;
}
if (range.equals("Hi")) {
if (num >= 8 && num <= 13) {
return 1;
} else {
return -1;
}
} else {
if (num >= 1 && num <= 6) {
return 1;
} else {
return -1;
}
}
}
}
The program reads in a long integer as the seed for the random number generator, and a String representing the range picked by the player. It then generates a random number between 1 and 13 inclusively using the given seed, and calls the getResult method to determine the result of the game. Finally, it prints out the result.
The getResult method takes an integer and a String as parameters, and returns an integer representing the result of the game. If the number generated is 7, it returns 0, indicating a draw. Otherwise, it checks whether the range picked by the player matches with the number generated, and returns 1 if the player wins, and -1 if the player loses.
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