1. The egrep pattern ([aeiou]{2}.*){2} when used to search for words in a large dictionary will include words such as "foolproof" but not a word like "queue". A. true B. false 2. A language L is regular if and only if for every long string z in L, z can be written as xyz with ly|>0 and such that xy"z is always in L for all n> 0. A. true B. false 3. For every language L that has a right-linear regular grammar G that can parse any string x in L with a right-leaning parse tree, then L also has a left-linear regular grammar G'.

1. The egrep pattern ([aeiou]{2}.*){2} when used to search for words in a large dictionary will include words such as "foolproof" but not a word like "queue". A. true B. false 2. A language L is regular if and only if for every long string z in L, z can be written as xyz with ly|>0 and such that xy"z is always in L for all n> 0. A. true B. false 3. For every language L that has a right-linear regular grammar G that can parse any string x in L with a right-leaning parse tree, then L also has a left-linear regular grammar G'.

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

# python demo script to illustrate dictionary usage to replace words in a sentenceInput is word pairs exactly with same whitespaces as here: Hi Hello Thanks Thank-you Bye Goodbye (one space between pairs, two spaces between every pairs)In a user's input sentence example as follows: Hi there, Thanks, Bye using the above given pairs as a dictionary to replace corresponding words in the input sentence, and the output becomes:Hello there, Thank-you, Goodbye Read input from user, first word pairs, then the sentence, split, loop over elements to replace what's entered from pair words into entered sentence. Comments are very important so I can understand. Thanks
Create a set-based implementation of an abstract data type with the following operations. insert(S, x) Insert x into the set S. delete(S, x) Delete x fromthe set S. member(S, x) Return true if x ∈ S, false otherwise. position(S, x) Return the number of elements of S less than x. concatenate(S, T) Set S to the union of S and T, assuming every element in S is smaller than every element of T. All operations on sets with n elements must finish in O(log n) time.
PROLOG LANGUAGE We flatten a list L by first removing all lists within L and replacing them with their members. Write a Prolog rule flattenit/2 which flattens a list. Note: there is a built-in called flatten - you should not use that in your answer. For example: :- flattenit([a,b,c,[d,e],f,[c, a, b]], [a,b,c,d,e,f,c,a,b]). :- flattenit([1,2,3,4,[5,6,[7,8]]], [1,2,3,4,5,6,7,8]). :- flattenit([1,2,[3,4,[5,6],7],8,[2,4,5,8]], [1,2,3,4,5,6,7,8,2,4,5,8]).
Haskell Textbook: "Programming in Haskell, 2ndEd.", by Graham Hutton Programming in Haskell: data Tree a b = Leaf a | Branch b (Tree a b) (Tree a b) Implement the three functions that traverse the tree inthe given order collecting the values from the tree nodes into a list:preorder :: (a -> c) -> (b -> c) -> Tree a b -> [c]inorder :: (a -> c) -> (b -> c) -> Tree a b -> [c]postorder :: (a -> c) -> (b -> c) -> Tree a b -> [c] Also, show how each of your three functions work step-by-step with the following tree object.tree1 :: Tree Int Stringtree1 = Branch "+"(Branch "*"(Leaf 3)(Branch "+" (Leaf 4) (Leaf 5)))(Branch "+"(Branch "*" (Leaf 6) (Leaf 7))(Leaf 8))Notice that the data type Tree can store different types of values in the leaves than onthe branching nodes. Thus, each of these functions takes two functions as arguments: Thefirst function maps the values stored in the leaves to some common type c, and the secondfunction maps the values…
In LISP, the function (copy-list <list>) (A) Returns a new list that is equal to <list> by copying the top-level element of <list> (B) Returns the length of <list> (C) Returns t if <list> is empty (D) None of the above
In C++, develop an algorithm that adds the value val to a queue object Q. The queue is represented using an array data of size s. The algorithm should assume that the queue is not full. The most recently added item is at index r (rear), and the least recently added item is at index f (front). If the queue is empty, r = f = -1.
*Needs to be done in scheme interleave* Implement function interleave in scheme, which expects as arguments two lists x and y, and returns asingle list obtained by choosing elements alternately, first from x and then from y. When either x or yruns out, interleave takes the remaining elements from the other list, so that the elements of the resultare exactly the elements of the two argument lists taken together. (interleave '(1 2 3) '(a b c)) -> (1 a 2 b 3 c) (interleave '(1 2 3) '(a b c d e f)) -> (1 a 2 b 3 c d e f) (interleave '(1 2 3 4 5 6) '(a b c)) -> (1 a 2 b 3 c 4 5 6)
Python data structures: write a function that takes in a list (L) as input, and returns the number of inversions. An inversion in L is a pair of elements x and y such that x appears before y in L, but x > y. Your function must run in -place and implement the best possible algoritm of time complexity. def inversions(L: List) -> int:'''finds and returns number of inversions'''
Let ∑ = {a, b, #} and L = { w | w cannot be written as t#s#t with s, t ∈ {a, b}*}. Show that L is not regular.
Question 6 Linked Lists lend themselves easily to recursive solutions. and it is common to traverse a list by processing a single element and then recursively calling the function on the remaining sub-list. Il does this by accepting a pointer to the current position in the list es a parameter. In the answers below. this has been referred to as the list pointer. what criteria is oten used as the base case that ends the recursion and allos the function to return to he original cal? The data element of the nade pointed to by the list pointer is storing-1. The list pointer points to the beginning of the ist. The list pointer is NULL None of the above. Question 7 when designing the Node structure for our linked list which attributes should we include? Select all that apply. A deta element to store whatever the list is supposed to store. A Node pointer to serve as the head of the list. © A Node pointer to the next element in the list. None of the above.
25. An array-based implementation of an linked list a. requires less memory to store an item than a pointer-based implementation b. is not a good choice for a small list d. has items which explicitly point to the next items c. has a variable access time
Write a LISP function f10 that finds the intersection of two lists. The intersection meansthe common elements of the two lists. Example: (f10 ‘(a (a b) c d) ‘(b(a b) d)) returns ((a b) d) CAN ONLY USE CAR AND CDR AND RECURSION SETQ AND DO LIST CANT BE USED