QUESTION 4Read each of the descriptions carefully. Decide whether the description applies to a List.a Dictionary, both strudu20 pointsThe structure is mutable. that is, the structure itself can be changed byadding, removing, or rearranging the elements in the structure.v The elements in the structure are "unorderedv The elements in the structure are iydered".v The structure works exactly ke array types delined in ather languages.A. Dictionaryv Flements in the structure are indexed.B. Bothv To add an element, use either the insert or append riethod.C. Neitherv To remave an element, use the pop method.D. ListAccess a single element of the structure by referring to its position in thestructure.v Access a single clement of the structure by referring to an index value.All elements in the structure must share a single data type (integer, fiaat,string, etrClick Sve and Sabmit to se and suhotit. Click Sate All Atsers to sae all a ers.

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Answered: QUESTION 4 Read each of the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Please just use main.cpp,sequence.cpp and sequence.h. It has provided the sample insert()function. No documentation (commenting) is required for this assignment. This assignment is based on an assignment from "Data Structures and Other Objects Using C++" by Michael Main and Walter Savitch. Use linked lists to implement a Sequence class that stores int values. Specification The specification of the class is below. There are 9 member functions (not counting the big 3) and 2 types to define. The idea behind this class is that there will be an internal iterator, i.e., an iterator that the client cannot access, but that the class itself manages. For example, if we have a Sequence object named s, we would use s.start() to set the iterator to the beginning of the list, and s.advance() to move the iterator to the next node in the list. (I'm making the analogy to iterators as a way to help you understand the point of what we are doing. If trying to think in terms of iterators is confusing,…
Exercise B: "Matrix Addition" For this exercise you will design and implement a function that takes two matrix arguments and computes their sum (if and only if a sum can actually be computed, returning an empty list otherwise). Two matrices can only be added together if they have exactly the same dimensions. If the dimensions are acceptable, then the matrix sum will have the same dimensions as either of the operands, and the value of each element in the matrix sum is itself the sum of the corresponding elements in the operand matrices. And although it does makes sense to test rectangularity before attempting addition, you need not perform this step (since you did it above). In order to complete this task, you will need to: ensure you know how matrix addition can be performed² ● Your submission for this exercise:
def animals(animal_dict, target): """ Filter animals based on the target category. :param animal_dict: A dictionary mapping animals to their categories. :type animal_dict: dict :param target: The target category to filter animals. :type target: str :return: A list of animals belonging to the target category. :rtype: list animals_dict = {"dogs": "mammals", "snakes": "reptiles", \ "dolphins": "mammals", "sharks": "fish"} >>> target = "mammals" >>> animals(animals_dict, target) ['dogs', 'dolphins'] >>> animals_dict = {True: "mammals"} >>> animals(animals_dict, target) # This will raise an AssertionError Traceback (most recent call last): ... AssertionError: Target should be provided and not None """ assert target is not None, "Target should be provided and not None" assert isinstance(animal_dict, dict) assert all(isinstance(animal, str) for animal in animal_dict.keys())…
In C++ Assume that a 5 element array of type string named boroughs has been declared and initialized. Write the code necessary to switch (exchange) the values of the first and last elements of the array.
i) Create a Node class that will hold three fields i.e an integer element and a reference to the next Node along with a reference to the previous Node. ii) Create a Dummy Headed Doubly Circular Linked list Abstract Data Type (ADT)named DoublyList.The elements in the list are Nodes consisting of an integer type key (all keys are unique) and a reference to the next node and a reference to the previous Node. Use Python. Do not use Numpy
def drop_uninformative_objects(X, y):# your code herereturn X_subset, y_subset # TEST drop_uninformative_objects functionA = pd.DataFrame(np.array([[0, 3, np.nan],[4, np.nan, np.nan],[np.nan, 6, 7],[np.nan, np.nan, np.nan],[5, 5, 5],[np.nan, 8, np.nan],]))b = pd.Series(np.arange(6))A_subset, b_subset = drop_uninformative_objects(A, b) assert A_subset.shape == (3, 3)assert b_subset.shape == (3,)
Re-write Sample Program 11.2 so that it works for an array of structures. Write the program so that it compares 6 circles. You will need to come up with a new way of determining which circle’s center is closest to the origin. Sample code 11.2 #include <iostream>#include <cmath> // necessary for pow function#include <iomanip>using namespace std;struct circle // declares the structure circle{ // This structure has 6 membersfloat centerX; // x coordinate of centerfloat centerY; // y coordinate of centerfloat radius;float area;float circumference;float distance_from_origin;};const float PI = 3.14159;int main(){circle circ1, circ2; // defines 2 circle structure variablescout << "Please enter the radius of the first circle: ";cin >> circ1.radius;cout << endl<< "Please enter the x-coordinate of the center: ";cin >> circ1.centerX;cout << endl<< "Please enter the y-coordinate of the center: ";cin >>…
create using c++ One problem with dynamic arrays is that once the array is created using the new operator the size cannot be changed. For example, you might want to add or delete entries from the array similar to the behavior of a vector . This project asks you to create a class called DynamicStringArray that includes member functions that allow it to emulate the behavior of a vector of strings. The class should have the following A private member variable called dynamicArray that references a dynamic array of type string. A private member variable called size that holds the number of entries in the array. A default constructor that sets the dynamic array to NULL and sets size to 0. A function that returns size . A function named addEntry that takes a string as input. The function should create a new dynamic array one element larger than dynamicArray , copy all elements from dynamicArray into the new array, add the new string onto the end of the new array, increment size, delete the…
hi I really need help with this assignment problem flip_matrix(mat:list)->list You will be given a single parameter a 2D list (A list with lists within it) this will look like a 2D matrix when printed out, see examples below. Your job is to flip the matrix on its horizontal axis. In other words, flip the matrix horizontally so that the bottom is at top and the top is at the bottom. Return the flipped matrix. To print the matrix to the console: print('\n'.join([''.join(['{:4}'.format(item) for item in row]) for row in mat])) Example: Matrix:W R I T XH D R L GL K F M VG I S T CW N M N FExpected:W N M N FG I S T CL K F M VH D R L GW R I T X Matrix:L CS PExpected:S PL C Matrix:A D JA Q HJ C IExpected:J C IA Q HA D J
@6 The Reference-based Linked Lists: Select all of the following statements that are true. options: As a singly linked list's node references both its predecessor and its successor, it is easily possible to traverse such a list in both directions. According to the terminology introduced in class, the head reference variable in a singly linked list object references the list's first node. According to the terminology introduced in class, in a doubly linked list, each node references both the head and tail node. In a double-ended singly linked list, the tail reference variable provides access to the entire list. In a circular linked list, the last node references the first node.
C++ Language Please add an execution chart for this code like the example below. I have provided the code and the example execution chart. : JUST NEED EXECUTION CHARTTT. Thanks Sample Execution Chart Template//your header files// constant size of the array// declare an array of BankAccount objects called accountsArray of size =SIZE// comments for other declarations with variable names etc and their functionality// function prototypes// method to fill array from file, details of input and output values and purpose of functionvoid fillArray (ifstream &input,BankAccount accountsArray[]);// method to find the largest account using balance as keyint largest(BankAccount accountsArray[]);// method to find the smallest account using balance as keyint smallest(BankAccount accountsArray[]);// method to display all elements of the accounts arrayvoid printArray(BankAccount accountsArray[]);int main() {// function calls come here:// give the function call and a comment about the purpose,//…
Which of the following statements regarding linked lists and arrays is correct? Group of answer choices: a. A dynamically resizable array makes insertions at the beginning of an array very efficient. b. Using a doubly linked list is more efficient than an array when accessing the ith element of a structure. c. A dynamically resizable array is another name for a linked list. d. Any type of list tends to be better than an array when there are a set number of maximum items known beforehand. e. If many deletions at any place in the structure were common, a linked list implementation would likely be preferable to an array

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