Do not add import statements # For simplicity, we'll use "Station" in our type contracts to indicate that# we mean a list containing station data.## You can read "Station" in a type contract as:List[int, str, float, float, int, int, int]### where the values at each index represent the station data as described in the# handout on Quercus.# A set of constants, each representing a list index for station information.ID = 0NAME = 1LATITUDE = 2LONGITUDE = 3САРАСІTY - 4BIKES_AVAILABLE = 5DOCKS_AVAILABLE = 6NO_KIOSK = 'SMART'# For use in the get_lat_lon_distance helper functionEARTH_RADIUS = 6371# SAMPLE DATA TO USE IN DOCSTRING EXAMPLESSAMPLE_STATIONS = [[7090, 'Danforth Ave / Lamb Ave',43.681991, -79.329455, 15, 4, 10],[7486, 'Gerrard St E / Ted Reeve Dr',43.684261, -79.299332, 24, 5, 19],[7571, 'Highfield Rd / Gerrard St E - SMART',43.671685, -79.325176, 19, 14, 5]]HANDOUT_STATIONS = [[7000, 'Ft. York / Capreol Crt.',43.639832, -79.395954, 31, 20, 11],[7001, 'Lower Jarvis St SMART / The Esplanade',43.647992, -79.370907, 15, 5, 10]] def rent_bike (station_id: int, stations: List["Station"]) -> bool:"""Update the available bike count and the docks available countfor the station in stations with id station_id as if a single bike wasremoved, leaving an additional dock available. Return True if and onlyif the rental was successful.Precondition: station_id will appear in stations.>>> with_bike_station = [7090, 'Danforth Ave / Lamb Ave', \43.681991, -79.329455, 15, 4, 10]>>> station_id = with_bike_station[ID]>>> original_bikes_available = with_bike_station[BIKES_AVAILABLE]>>> original_docks_available>>> rent_bike(station_id, [with_bike_station])with_bike_station[DOCKS_AVAILABLE]True>>> original_bikes_available1 ==with_bike_station[BIKES_AVAILABLE]-True>>> original_docks_available + 1 ==with_bike_station[DOCKS_AVAILABLE]True>>> no_bike_station43.681991, -79.329455, 15, 0, 15]>>> station_id = no_bike_station[ID]>>> original_bikes_available = no_bike_station[BIKES_AVAILABLE]>>> original_docks_available>>> rent_bike(station_id, [no_bike_station])[7090, 'Danforth Ave / Lamb Ave', \no_bike_station[DOCKS_AVAILABLE]False>>> original_bikes_availableno_bike_station[BIKES_AVAILABLE]==True>>> original_docks_availableno_bike_station[DOCKS_AVAILABLE]True

# For simplicity, we'll use "Station" in our type contracts to indicate that # we mean a list containing station data. # You can read "Station" in a type contract as: List[int, str, float, float, int, int, int] # # where the values at each index represent the station data as described in the # handout on Quercus. # A set of constants, each representing a list index for station information. ID = 0 NAME = 1 LATITUDE = 2 LONGITUDE = 3 CAPACITY = 4 BIKES_AVAILABLE = 5 DOCKS_AVAILABLE = 6 NO_KIOSK = ' SMART' # For use in the get_lat_lon_distance helper function EARTH_RADIUS = 6371 # SAMPLE DATA TO USE IN DOCSTRING EXAMPLES SAMPLE_STATIONS = [ [7090, 'Danforth Ave / Lamb Ave', 43.681991, -79.329455, 15, 4, 10], [7486, 'Gerrard St E / Ted Reeve Dr', 43.684261, -79.299332, 24, 5, 19], [7571, 'Highfield Rd / Gerrard St E - SMART', 43.671685, -79.325176, 19, 14, 5]] HANDOUT_STATIONS = [ [7000, 'Ft. York / Capreol Crt.', 43.639832, -79.395954, 31, 20, 11], [7001, 'Lower Jarvis St SMART / The Esplanade', 43.647992, -79.370907, 15, 5, 10]]

# For simplicity, we'll use "Station" in our type contracts to indicate that # we mean a list containing station data. # You can read "Station" in a type contract as: List[int, str, float, float, int, int, int] # # where the values at each index represent the station data as described in the # handout on Quercus. # A set of constants, each representing a list index for station information. ID = 0 NAME = 1 LATITUDE = 2 LONGITUDE = 3 CAPACITY = 4 BIKES_AVAILABLE = 5 DOCKS_AVAILABLE = 6 NO_KIOSK = ' SMART' # For use in the get_lat_lon_distance helper function EARTH_RADIUS = 6371 # SAMPLE DATA TO USE IN DOCSTRING EXAMPLES SAMPLE_STATIONS = [ [7090, 'Danforth Ave / Lamb Ave', 43.681991, -79.329455, 15, 4, 10], [7486, 'Gerrard St E / Ted Reeve Dr', 43.684261, -79.299332, 24, 5, 19], [7571, 'Highfield Rd / Gerrard St E - SMART', 43.671685, -79.325176, 19, 14, 5]] HANDOUT_STATIONS = [ [7000, 'Ft. York / Capreol Crt.', 43.639832, -79.395954, 31, 20, 11], [7001, 'Lower Jarvis St SMART / The Esplanade', 43.647992, -79.370907, 15, 5, 10]]

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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def upgrade_stations(threshold: int, num_bikes: int, stations: List["Station"]) -> int: """Modify each station in stations that has a capacity that is less than threshold by adding num_bikes to the capacity and bikes available counts. Modify each station at most once. Return the total number of bikes that were added to the bike share network. Precondition: num_bikes >= 0 >>> handout_copy = [HANDOUT_STATIONS[0][:], HANDOUT_STATIONS[1][:]] >>> upgrade_stations(25, 5, handout_copy) 5 >>> handout_copy[0] == HANDOUT_STATIONS[0] True >>> handout_copy[1] == [7001, 'Lower Jarvis St SMART / The Esplanade', \ 43.647992, -79.370907, 20, 10, 10] True """
# A set of constants, each representing a list index for station information. ID = 0 NAME = 1 LATITUDE %3D LONGITUDE 3 САРАСITY 4 BIKES_AVAILABLE %3D DOCKS_AVAILABLE %3D NO_KIOSK "SMART' # For use in the get_lat_lon_distance helper function EARTH_RADIUS = 6371 # SAMPLE DATA TO USE IN DOCSTRING EXAMPLES SAMPLE_STATIONS [7090, 'Danforth Ave / Lamb Ave', 43.681991, -79.329455, 15, 4, 10], [7486, 'Gerrard St E / Ted Reeve Dr', 43.684261, -79.299332, 24, 5, 19], [7571, 'Highfield Rd / Gerrard St E - SMART', 43.671685, -79.325176, 19, 14, 5]] HANDOUT_STATIONS [7000, 'Ft. York / Capreol Crt.', 43.639832, -79.395954, 31, 20, 11], [7001, 'Lower Jarvis St SMART / The Esplanade', 43.647992, -79.370907, 15, 5, 10]]
def upgrade_stations(threshold: int, num_bikes: int, stations: List["Station"]) -> int: """Modify each station in stations that has a capacity that is less than threshold by adding num_bikes to the capacity and bikes available counts. Modify each station at most once. Return the total number of bikes that were added to the bike share network. Precondition: num_bikes >= 0
Tour.java Create a Tour data type that represents the sequence of points visited in a TSP tour. Represent the tour as a circular linked list of nodes, one for each point in the tour. Each Node contains two references: one to the associated Point and the other to the next Node in the tour. Each constructor must take constant time. All instance methods must take time linear (or better) in the number of points currently in the tour. To represent a node, within Tour.java, define a nested class Node: private class Node { private Point p; private Node next; } Your Tour data type must implement the following API. You must not add public methods to the API; however, you may add private instance variables or methods (which are only accessible in the class in which they are declared). public class Tour // Creates an empty tour. public Tour() // Creates the 4-point tour a→b→c→d→a (for debugging). public Tour(Point a, Point b, Point c, Point d) // Returns the number of points in this tour. public…
code: public class PasswordGeneratorAndStorage {/*** Adds an application to the applications ArrayList. If index is -1, add application* to the end of applications. Else is index is within the size of applications, add* application at that index in applications. Otherwise, return. However, if applications * or application is null, return.* * @param applications* @param application* @param index*/public static void addApplication(ArrayList<String> applications, String application, int index) {// TODO: FILL IN BODY}/*** Generates a random password of length passwordLength and adds it to the end of* passwords if index is -1, or adds it to the index of passwords if index is within the* size of passwords (similar to how the addApplication adds an application). To generate* the random password, use rand to generate a random int within the size of characters. You* can then use this int to grab the char at that index in characters and concatenate that* to your String password variable.…
TRUE OR FALSE 1. It is possible to traverse the elements of a Set without using an Iterator? 2. The functionality of functional interfaces is limited to one.
Part 1: autocomplete term. Write an immutable data type Term.java that represents an autocomplete term-a query string and an associated integer weight. You must implement the following API, which supports comparing terms by three different orders: lexicographic order by query string (the natural order); in descending order by weight (an alternate order); and lexicographic order by query string but using only the first r characters (a family of alternate orderings). The last order may seem a bit odd, but you will use it in Part 3 to find all query strings that start with a given prefix (of length r). public class Term implements Comparable { // Initializes a term with the given query string and weight. public Term (String query, long weight) // Compares the two terms in descending order by weight. public static Comparator byReverseWeight0rder () // Compares the two terms in lexicographic order, // but using only the first r characters of each query. public static Comparator…
addCourse: accepts an object of type Course as the first parameter and the idNum of the Student as the second parameter. The Course can be added only if the Student object with the specified idNum exists in the studentsList, Course does not exist in the coursesRegistered list for the Student, After adding the course, the number of credits, do not exceed 18. If the course is added successfully, return true, else return false.
deleteCourse: accepts an object of type Course as the first parameter and the idNum of the Student as the second parameter. The Course can be deleted only if the Student exists in the studentList and the Course exists in the list of courses registered for that student.
Create a node class named LinkedNodes that uses up to 4 dynamic pointers to connect it to the other 8 nodes in the structure (a total of 9). The data in each node will be a unique integer number from 1 through 9. Include in your class definition these functions at a minimum: getVal(), setVal(), getNext(), setNext(), getPrev(), setPrev(), constructor(s) and destructor. Write a simple program to load these nodes into a linked structure. Do not use an array, the pointers will do that for you. You should be able to reach any node from any other node in the structure by traversing a maximum of 2 nodes from the current one. The output from your program should report the traversals between all nodes in the structure, starting with the node whose value is one. (See the example below) Node 1 2 3 4 5 6 7 8 9 -> Traverses to Node 1 Node 2 1->2 2->6->1 3->6->1 3->7->2 4->6->1 4->7->2 4->8->3 5->6->1 5->7->2 5->8->3 6->1->2 6->1->3 7->1->3 8->3 6->1 7->1 8->1 9->1 Node 3 1->3 2->3 7->2 8->2 9->2…
def update_task(task_list, task_id, task_field, task_update): """ Given * the task list (`task_list`) * the task index that has been selected (`task_id`) * the field of the selected task (`task_field`) * the updated information (`task_update`) Validate the parameters to check for syntax and structure. If all validations passed, return a tuple with a boolean True and the updated task (a dictionary from the `task_list` at the provided `task_id`). Ff validations fail, return a tuple with a boolean False and a string with the task_field that caused the error during validation. """ task_list = input() task_id = input() task_field = input() task_update = input() if task_id is is_valid_index(): if (task_field is in task_list.item()): return True , task_list(task_id) else: return (False , "field") else: return (False, "idx") fields = [ 'name', 'description', 'deadline',…
get_total_cases() takes the a 2D-list (similar to database) and an integer x from this set {0, 1, 2} as input parameters. Here, 0 represents Case_Reported_Date, 1 represents Age_Group and 2 represents Client_Gender (these are the fields on the header row, the integer value represents the index of each of these fields on that row). This function computes the total number of reported cases for each instance of x in the text file, and it stores this information in a dictionary in this form {an_instance_of_x : total_case}. Finally, it returns the dictionary and the total number of all reported cases saved in this dictionary.