Write a function find_equivalent_matchings that takes a matching and returns all matchings with the same pattern (including the original one).Using this function, draw all matchings equivalent to {(0, 7), (1, 4), (2, 3), (5, 6)}.You might find it helpful to generate all permutations of a list using itertools.permutation (imported above) as in the following code template.perms=permutations (list_of_items)for p in perms: There is a different way of looking at arc diagrams. Let us fix the start and end points of the arcs. We can then ask ourselves how many arc diagrams there are that havethe same pattern of start and end points.For example, if n = 2 and arcs start at 0, 1 and end at 2, 3, we find two arc diagrams which share this pattern.{(1, 2), (0, 3)}1 nesting, O crossings{(0, 2), (1, 3)}O nestings, 1 crossing

{(2, 3), (0, 5), (4, 7), (1, 6)}{(2, 3), (0, 7), (4, 6), (1, 5)}{(3, 4), (0, 7), (6, 1), (2, 5)}{(4,…

Answered: Write a function…

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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Implement the following function. Hint: You should use a dictionary. def word_pattern (pattern: str, words: List [str]) -> bool: I ''Given a pattern and a word list, determine if the word list follows the same pattern. That is to say, ensure that pattern [j] pattern [k] only when words [j] == words [k] pattern [j] = pattern [k] means words [j] != words [k] Precondition: Assume pattern is all lowercase letters. >>> word_pattern ('aaaa', ['cat', 'cat', 'cat', 'cat']) True and == >>> word_pattern ('yoox', ['dog', 'cat', 'cat', 'fish']) True >>> word_pattern ('xy', ['cat', 'cat']) False >>> word_pattern('xoox', ['dog', 'cat', 'cat', 'fish']) False
You are required to complete the LinkedList class. This class is used as a linked list that has many methods to perform operations on the linked list. To create a linked list, create an object of this class and use the addFirst or addLast or add (must be completed) to add nodes to this linked list(I created one linked list in TestLinkedList). I’ve already created the class for you and have some completed method in there, your job is to complete the empty methods.For every method you have to complete, you are provided with a header, Do not modify those headers( method name, return type or parameters). You have to complete the body of the method. public void add(T afterThis, T info) The parameter info will be the information the new node should contain, and the new node will be added after the node that contains the parameter afterThis as an information public void removeFirst() Removes the first node in the linked list. Hint: be aware of empty lists. public void removeLast() Removes…
You are going to implement a program that creates an unsorted list by using a linked list implemented by yourself. NOT allowed to use LinkedList class or any other classes that offers list functions. It is REQUIRED to use an ItemType class and a NodeType struct to solve this homework. The “data.txt” file has three lines of data 100, 110, 120, 130, 140, 150, 160 100, 130, 160 1@0, 2@3, 3@END You need to 1. create an empty unsorted list 2. add the numbers from the first line to list using putItem() function. Then print all the current keys to command line in one line using printAll(). 3. delete the numbers given by the second line in the list by using deleteItem() function. Then print all the current keys to command line in one line using printAll().. 4. putItem () the numbers in the third line of the data file to the corresponding location in the list. For example, 1@0 means adding number 1 at position 0 of the list. Then print all the current keys to command line in one…
Create a method that checks if two sets of integers are equivalent by writing a function to compare them. If two lists are drastically different, the method should highlight the greater of their maximum values.
You may do this assignment using either Java or C++. Do *not use the JDK LinkedList class or any linked list library! A linked list consists of zero or more nodes, which each contain one item of data and a link (Java reference, C++ pointer or reference) to the next node, if there is one. Linked List code is usually generic, so that you can use it to create a list of Strings, Students, Doubles, etc. For this assignment, you will write a simplified version of linked list that only can be used to create and use a list of ints and that has only a few of the functions typical of linked lists. The data element can be just an int, and the data type of the link to the next node can be just Node. You will need a reference (Java) or either a reference or a pointer (C++) to the first node, as well as one to the last node. Write a method/function that takes an in, creates a node with that int as its data value, and adds the node to the end of the list. This function will need to update the…
Modify the quick sort implementation in the textbook to sort the array using pivot as the median of the first, last, and middle elements of the array. Add the modified quick sort implementation to the arrayListType class provided (arrayListType.h). Ask the user to enter a list of positive integers ending with -999, sort the integers, and display the pivots for each iteration and the sorted array. Main Function #include <iostream>#include "arrayListType.h"using namespace std; int main(){ arrayListType<int> list;int num;cout << "Line 8: Enter numbers ending with -999" << endl;cin >> num; while (num != -999){list.insert(num);cin >> num;} cout << "Line 15: The list before sorting:" << endl;list.print();cout << endl; list.selectionSort();cout << "Line 19: The list after sorting:" << endl;list.print();cout << endl; return 0;} Header File (arrayList.h) Including images #include <iostream>#include <cassert>…
Write a for loop to print all elements in courseGrades, following each element with a space (including the last). Print forwards, then backwards. End each loop with a newline. Ex: If courseGrades = {7, 9, 11, 10}, print:7 9 11 10 10 11 9 7 Hint: Use two for loops. Second loop starts with i = NUM_VALS - 1. Note: These activities may test code with different test values. This activity will perform two tests, both with a 4-element array (int courseGrades[4]). Also note: If the submitted code tries to access an invalid array element, such as courseGrades[9] for a 4-element array, the test may generate strange results. Or the test may crash and report "Program end never reached", in which case the system doesn't print the test case that caused the reported message. #include <iostream>using namespace std; int main() { const int NUM_VALS = 4; int courseGrades[NUM_VALS]; int i; for (i = 0; i < NUM_VALS; ++i) { cin >> courseGrades[i]; } /* Your solution goes…
Complete the doctring.def average_daily_temp(high_temps: List[int], low_temps: List[int]) -> List[float]: """high_temps and low_temps are daily high and low temperatures for a series of days. Return a new list of temperatures where each item is the daily average. Precondition: len(high_temps) == len(low_temps) >>> average_daily_temp([26, 27, 27, 28, 27, 26], [20, 20, 20, 20, 21, 21]) [23.0, 23.5, 23.5, 24.0, 24.0, 23.5] """
In this project you will implement a Set class which represents a general collection of values. For this assignment, a set is generally defined as a list of values that is sorted and does not contain any duplicate values. More specifically, a set shall contain no pair of elements e1 and e2 such that e1.equals(e2) and no null elements. Requirements To ensure consistency among all implementations there are some requirements that all implementations must maintain. • Your implementation should reflect the definition of a set at all times. • For simplicity, your set will be used to store Integer objects. • An ArrayList object must be used to represent the set. • All methods that have an object parameter must be able to handle an input of null. • Methods such as Collections.sort that automatically sort a list may not be used. • The Set class shall reside in the default package. Recommendations There are deviations in program implementation that are acceptable and will not impact the overall…
In AList class, we have the get function to return an item at a particular position in list indexed by i. For example, let L=[1,2,3]. A call to L.get (1) will return 2. Write in the answer an enhanced get function to accept negative indices. Specifically, the last item has index -1, the second last item has index -2, and the i-th last item has index -i. For example, let L=[1,2,31. A call to L.get (-1) will return 3. A call to L.get (-2) will return 2. A call to L.get (-3) will return 1. Below is a skeleton of the AList class: template class AList { private: /** The underlying array. */ ItemType *items; /** Stores the current size of the list. */ int count; /** Max number of items allowed. */ int maxCnt; public: // Other functions omitted... ItemType get (int i) { // Copy this function in the answer and write code below this line. } ;
You are given an array-like data structure Listy which lacks a size method. It does, however, have an elementAt ( i) method that returns the element at index i in 0( 1) time. If i is beyond the bounds of the data structure, it returns -1. (For this reason, the data structure only supports positive integers.) Given a Listy which contains sorted, positive integers, find the index at which an element x occurs. If x occurs multiple times, you may return any index. Write code with explanation
Write a template function that takes as parameter a vector of a generic type and reverses the order of elements in the vector, and then add the function to the program you wrote for Programming Challenge 5. Modify the driver program to test the new function by reversing and outputting vectors whose element types are char, int, double, and string.

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