You are given a collection of N non-empty strings, denoted by S₁, S2,..., Sn. Then you are given N-1 operations which you execute in the order they are given. The ith operation is has the following format: 'a b' (1-based indexing, without the quotes), which means that you have to make the following changes: 1. Sa = Sa+Sb, i.e. concatenate ath string and 6th string and store the result in ath string, 2. St = "", i.e. make the 6th string empty, after doing the previous step. You are ensured that after the ith operation, there will be no future operation that will be accessing S. Given these operations to join strings, print the last string that will remain at the end of this process.

You are given a collection of N non-empty strings, denoted by S₁, S2,..., Sn. Then you are given N-1 operations which you execute in the order they are given. The ith operation is has the following format: 'a b' (1-based indexing, without the quotes), which means that you have to make the following changes: 1. Sa = Sa+Sb, i.e. concatenate ath string and 6th string and store the result in ath string, 2. St = "", i.e. make the 6th string empty, after doing the previous step. You are ensured that after the ith operation, there will be no future operation that will be accessing S. Given these operations to join strings, print the last string that will remain at the end of this process.

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

See similar textbooks

Similar questions

The question should be done in C++, please give explanation and running result. 1. For this question, we need to provide more information about where the mismatch of the text file is happening. Write a recursive function called list_mismatched_lines that takes 2 filenames as input arguments and displays to the screen all mismatched lines in those files. This function should use hashing techniques and shall not compare strings to detect mismatch. The signature of this function should be: void list_mismatched_lines(std::string file1, std::string file2); In file1.txt, it contains "My dear C++ class. I hope that you enjoy this assignment. " In file2.txt, it contains "My dear C++ class. I hope that you like this assignment. " Example: Running the following line of code, should print to the screen the mismatched lines only, from both files. list_mismatched_lines(file1, file2); The following output should be seen on the screen: file1.txt: I hope that you enjoy this assignment.file2.txt:…
Create a list of 20 random grades between 0 and 100. Write the code for a filtering that generates a list of grades that are A or B only (80<= grades <<100). Use filtering and lambda to create the auxiliary function.
What is the value of the median-of-3 for the following list. [80, 47, 41, 21, 40, 68, 78, 18, 75, 46, 30] Notes: • Your answer should be a single valid, non-negative, literal Python int value. For example, 123 is a valid int literal. • This question is asking about before any partition operation is carried out. • This is not asking for the median-of-3 index. • You can pre-check your answer (to check it's a valid, non-negative, literal int).
Computer Science Done in Perl. Someone gave me a wrong/incomplete answer. Write a function, hashsum, which takes a hash reference as its first argument and an array reference as its second argument. The function should take the elements of the array and use them as keys in the hash. The values in the hash corresponding to the keys in the array should be totaled, and the sum should be returned to the user. If a key passed in the array does not exist in the hash, ignore it. Write a sample program to call this function.
In c++ The Fibonacci numbers are a series of numbers that exhibit the following pattern: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, … The series starts with 0 and 1, and each subsequent number in the series is the sum of the previous two numbers. The Fibonacci sequence, Fn, is defined by the following recurrence relation: Fn = Fn-1 + Fn-2 Where the initial values are F0 = 0 and F1 = 1. Write a program that prompts the user to enter in a positive integer N and generates the Nth Fibonacci number. Your main function should handle user input and pass that data to a function called Fib that takes integer N as input and returns the Nth Fibonacci number. Include the functions preconditions and postconditions as comments in your source code. Include some basic input validation to make sure the function’s preconditions are met before the function is called. Show your source code and a sample of your program output.
What is the index of the median-of-3 for the following list. [69, 24, 97, 12, 62, 64, 17, 65, 70, 28] Notes: • Your answer should be a single valid, non-negative, literal Python int value. For example, 123 is a valid int literal. • This question is asking about before any partition operation is carried out. • This is not asking for the median-of-3 value. • You can pre-check your answer (to check it's a valid, non-negative, literal int). Answer: (penalty regime: 10, 20, ... %) Precheck Check
The goal is to rewrite the function, below, such that passes in a different list of parameters, particularly eliminating the need to pass low and high for each recursive call to binary_search. defbinary_search(nums,low,high,item): mid=(low+high)//2iflow>high:returnFalse #The item doesn't exist in the list!elifnums[mid]==item:returnTrue# The item exists in the list!elifitem<nums[mid]:returnbinary_search(nums,low,mid-1,item)else:returnbinary_search(nums,mid+1,high,item) The new function should be prototyped below. The number of changes between the given version, and the one requested is not significant. defbinary_search(nums,item):pass# Remove this and fill in with your code Tip: If you consider that high and low are used to create a smaller version of our problem to be processed recursively, the version requested will do the same thing, just through a different, more Pythonic technique.
Take an Infix expression from the user and convert to a Postfix expression using Stacks. The use of pointers is not allowed.
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
You are given the pointer to the head node of a linked list and an integer to add to the list. Create a new node with the given integer. Insert this node at the tail of the linked list and return the head node of the linked list formed after inserting this new node. The given head pointer may be null, meaning that the initial list is empty. Function Description Complete the insertNodeAtTail function in the editor below. insertNodeAtTail has the following parameters: SinglyLinkedListNode pointer head: a reference to the head of a list int data: the data value for the node to insert Returns SinglyLinkedListNode pointer: reference to the head of the modified linked list Input Format The first line contains an integer , the number of elements in the linked list.The next lines contain an integer each, the value that needs to be inserted at tail. Constraints Sample Input STDIN Function ----- -------- 5 size of linked list n = 5 141 linked list data values…
Write a function that takes in a list of integers L and an integar n. The function returns the absolute value of the sum of the every other nth element of L. Make sure not to use an index outside the possible locations within L.
#The Iris Dataset import sklearn.datasetsimport matplotlib.pyplot as plt import numpy as np import scipy iris = sklearn.datasets.load_iris() Write a function that takes in an index i and prints out a verbose desciption of the species and measurements for data point i. For example:Data point 5 is of the species setosaIts sepal length (cm) is 5.4Its sepal width (cm) is 3.9Its petal length (cm) is 1.7Its petal width (cm) is 0.4