Question 4a: Construct a DFA which accepts all strings over A = {a, b, c, d, e, f, g} which have even length (treat zero as even). Question 4b: Construct a DFA over the alphabet (a, b) which accepts only those strings that have a's in multiples of 3.
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- def reverse_sentence(s: str) -> str:"""Given a sentence <s>, we define a word within <s> to be a continuoussequence of characters in <s> that starts with a capital letter andends before the next capital letter in the string or at the end ofthe string, whichever comes first. A word can include a mixture ofpunctuation and spaces.This means that in the string 'ATest string!', there are in fact only twowords: 'A' and 'Test string!'. Again, keep in mind that words start with acapital letter and continue until the next capital letter or the end of thestring, which is why we consider 'Test string!' as one word.This function will reverse each word found in the string, and return a newstring with the reversed words, as illustrated in the doctest below.>>> reverse_sentence('ATest string!')'A!gnirts tseT' """ do it on python, and do not use any list, import or split, or append or join.def reverse_sentence(s: str) -> str:"""Given a sentence <s>, we define a word within <s> to be a continuoussequence of characters in <s> that starts with a capital letter andends before the next capital letter in the string or at the end ofthe string, whichever comes first. A word can include a mixture ofpunctuation and spaces.This means that in the string 'ATest string!', there are in fact only twowords: 'A' and 'Test string!'. Again, keep in mind that words start with acapital letter and continue until the next capital letter or the end of thestring, which is why we consider 'Test string!' as one word.This function will reverse each word found in the string, and return a newstring with the reversed words, as illustrated in the doctest below.>>> reverse_sentence('watchNow')'watchwoN' >>> reverse_sentence('hot')'hot' """ do it on python, and do not use any list, import or split, or append or join.def reverse_sentence(s: str) -> str:"""Given a sentence <s>, we define a word within <s> to be a continuoussequence of characters in <s> that starts with a capital letter andends before the next capital letter in the string or at the end ofthe string, whichever comes first. A word can include a mixture ofpunctuation and spaces.This means that in the string 'ATest string!', there are in fact only twowords: 'A' and 'Test string!'. Again, keep in mind that words start with acapital letter and continue until the next capital letter or the end of thestring, which is why we consider 'Test string!' as one word.This function will reverse each word found in the string, and return a newstring with the reversed words, as illustrated in the doctest below.>>> reverse_sentence('ATest string!')'A!gnirts tseT'""" pass
- def reverse_sentence(s: str) -> str:"""Given a sentence <s>, we define a word within <s> to be a continuoussequence of characters in <s> that starts with a capital letter andends before the next capital letter in the string or at the end ofthe string, whichever comes first. A word can include a mixture ofpunctuation and spaces.This means that in the string 'ATest string!', there are in fact only twowords: 'A' and 'Test string!'. Again, keep in mind that words start with acapital letter and continue until the next capital letter or the end of thestring, which is why we consider 'Test string!' as one word.This function will reverse each word found in the string, and return a newstring with the reversed words, as illustrated in the doctest below.>>> reverse_sentence('ATest string!')'A!gnirts tseT' """Write a function that when given a URL as a string, parses out just the domain name and returns it as a string. Examples:domain_name("http://github.com/SaadBenn") == "github" domain_name("http://www.zombie-bites.com") == "zombie-bites"domain_name("https://www.cnet.com") == "cnet"Note: The idea is not to use any built-in libraries such as re (regular expression) or urlparse except .split() built-in function""" # Non pythonic waydef domain_name_1(url): #grab only the non http(s) part full_domain_name = url.split('//')[-1] #grab the actual one depending on the len of the list actual_domain = full_domain_name.split('.') # case when www is in the url if (len(actual_domain) > 2): return actual_domain[1] # case when www is not in the url return actual_domain[0] # pythonic one linerdef domain_name_2(url):A substring of a string is a contiguous sequence of characters from the string. For example, BC is a substringof ABCD which starts from the second character of ABCD. Another example, ABC is a substring of ABCD whichstarts from the first character of ABCD. Note that ABCD itself is also a substring of ABCD.In this problem, we define a special substring as a non-empty substring that contains only the same character.For example, B and CC are special substrings of ABBCCC, while ABBC and BC are not special substrings.You are given a string S of length N and an integer K. Your task is to determine the minimum number ofcharacters of S that need to be changed such that there exists a special substring of length K in S.For example, let N = 6, K = 4, and S = ABBCCC. In this example, we only need to change the third characterof S to C (i.e. ABBCCC → ABCCCC) so that we have a special substring CCCC of length 4.InputInput begins with a line containing two integers: N K (1 ≤ K ≤ N ≤ 100 000)…
- 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?Build a DFA that accepts the set of string over {a,b} in which the number of a’s is divisible by three.Build an FA that accepts only those words that have an even numberof letters total.
- 1.a. Write a Regular Expression Language over ∑ = {a,b,c} a set of strings terminated by a or b. .b. Write a regular expression for the set of binary strings where each string has at least one pair of consecutive zeros. c. write the regular expression for the following, where sigma = (a,b): i. string of length at least 2 ii. string of length at most 2 iii. all string starting with a and ending with b iv. Even length StringsCreate a function that takes a grid of # and -, where each hash (#) represents amine and each dash (-) represents a mine-free spot.Return a grid, where each dash is replaced by a digit, indicating the number ofmines immediately adjacent to the spot i.e. (horizontally, vertically, anddiagonally).Example of an input:[ ["-", "-", "-", "#", "#"],["-", "#", "-", "-", "-"],["-", "-", "#", "-", "-"],["-", "#", "#", "-", "-"],["-", "-", "-", "-", "-"] ]Example of the expected output:[ ["1", "1", "2", "#", "#"],["1", "#", "3", "3", "2"],["2", "4", "#", "2", "0"],["1", "#", "#", "2", "0"],["1", "2", "2", "1", "0"] ]Here is a tip. When checking adjacent positions to a specific position in the grid,the following table might assist you in determining adjacent indexes:NW position =current_row - 1current_col - 1N position =current_row - 1current_colNE position =current_row - 1current_col + 1W position =current_rowcurrent_col - 1Current position =current_rowcurrent_colE position…Assume the alphabet ∑ is {a, b, c}. In the following questions, give a regular expression that represents the described set. a) The set of all strings over {a, b, c} containg at least one b or at least one c. b) The set of all strings over {a, b, c} that begins with bb and ends with cc. c) The set of all strings over {a, b, c} that contains the substing ab or bc. d) The set of all strings over {a, b, c} either starts and ends with a or starts and ends with c. e) The set of all strings over {a, b, c} starts with at least one a and ends with at least one b immediately followed by zero or more number of c.