1. The set of all strings consisting of an open bracket (the symbol [) followed by a list of zero or more digits separated by commas, followed by a closing bracket (the symbol ]).
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Give a BNF and an EBNF grammar for each of the languages:
Please do part L
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- Let Σ = {a, b, c}, let L1 be the set of all the strings over Σ which have the same number ofa’s, b’s and c’s, and let L2 the set of strings of Σ where all the a’s precede all the b’s andall the b’s precede all the c’s. What is:(a) L1 ∩ L2?(b) L1 ∪ L2?(c) L1?(d) L2?(e) L1 ⊕ L2?2. Let {a, b, c} be an alphabet. List all of the words in Σ2A fibonacci series is defined as a series where the number at the current index, is the value of the summation of the index preceding it (index -1) and (index-2). Essentially, for a list fibonacci_numbers which is the fibonacci numbers series, fibonacci_numbers[i] = fibonacci_numbers[i-1] + fibonacci_numbers[i-2] The fibonacci series always begins with 0, and then a 1 follows. So an example for fibonacci series up to the first 7 values would be - 0, 1, 1, 2, 3, 5, 8, 13 Complete the fibonacci(n) function, which takes in an index, n, and returns the nth value in the sequence. Any negative index values should return -1. Ex: If the input is: 7 the output is: fibonacci(7) is 13 Important Note Use recursion and DO NOT use any loops. Review the Week 9 class recording to see a variation of this solution. def fibonacci(n): if (n < 0 ): return -1 else: return n fibonacci_numbers = (fibonacci[n - 1] + fibonacci[n - 2]) return fibonacci_numbers(n) # TODO: Write…
- Given a list of integers, implement a function that returns a list of all the subsets of the input list, where each subset is represented as a list of integers.The list Q has numbers 1, square root of 2, x, and x^2, where x>0 and the range of the numbers in the list is 4. quanity A= x quanity b= 2 which quanity is greater?Use list comprehension to make a list that has the entries as all possible sums of the elements in the lists [3, 5, 6] and [10, 13, 27], i.e. [13, 16, 30, 15, 18, 32, 16, 19, 33]
- Do you know what the difference is between a single-linked list and a doubly-linked list? When is it better to use a singly-linked list rather than a doubly-linked list?When is it better to use a doubly-linked list rather than a singly-linked list? In a search for a node that is part of a linked list with N elements, how many nodes will be visited and how long will it take? Describe the best- and worst-case scenarios that may occur during a search operation.Explain why the RemoveAfter() function is present in a singly-linked list yet the Remove() function is present in a doubly-linked list.Could the RemoveAfter() function be extended to include a doubly-linked list as well as a simple list? Explain why you believe this is the case, or why you believe it is not the case.What are the chances of implementing a Remove() function for a singly-linked list? Explain why you believe this is the case, or why you believe it is not the case.Please fill in sentences A, B, and C. Word bank for each blank: - Spanning - Selecting - Sequencing - Returning - RepeatingConsider a Double Linked List with just one node and then select the correct statement: a. Both the head and the tail points to each other b. The head and the tail point to the same node in the list c. The head points to the node but the tail points to null d. The tail points to the node but the head points to null
- please code in python Given a word, provided below, use a single comprehension to make a list of all strings that can be formed by replacing exactly one vowel in the word with a different vowel (a vowel is a,e,i,o,u). Required output: ['Baoted', 'Beoted', 'Bioted', 'Buoted', 'Boated', 'Boeted', 'Boited', 'Bouted', 'Bootad', 'Bootid', 'Bootod', 'Bootud'] # Q4-5-5 Grading Tag: word = "Booted"Given a 2D list of characters and a list of tuples containing replacement pairs, write Pythoncode to replace each character in the list with its replacement. The tuples are of the form (current_char,replacement_char). Print out your list with each row on a new line. For example, given the following listand its replacement pairs: data = [['a','p','p','l','e'], ['b','a','n','a','n','a'], ['c','h','e','r','r','y']] replacements = [('a', 'X'),('b', 'Y'),('c', 'Z')] The output after replacement is: Xpple YXnXnX ZherryComplete the examples in the docstring and then write the body of thefollowing function:def same_first_last(L):""" (list) -> boolPrecondition: len(L) >= 2Return True if and only if first item of the list is the same as thelast.>>> same_first_last([3, 4, 2, 8, 3])True>>> same_first_last(['apple', 'banana', 'pear'])>>> same_first_last([4.0, 4.5])"""