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- Use a while loop function instead of a for loop sing pythonComplete this code fragment which is supposed to count the number of alphanumeric characters in a string s (you may use Character.isDigit and Character.isLetter methods to check if a character is a digit or a letter respectively).for(int i = 0; i < s.length(); i++) {if (........................................................){count++;}}Assume strings of length 12. Each string are made of letters: x and/or y How many strings of length 12 have at least three y’ s
- Q4: Colouring Book Having spent the last couple of hours grading assignments, I decide it’s time for a break. I take out my favourite colouring book, turn to a random page I haven’t coloured in yet, and lay it on my desk. I then take out all my n crayons and line them up on the desk (it’s a very long desk). The colour of the ith crayon is a string c[i] (e.g. "blue"). Many of the crayons have the same colour. In fact, no matter how many crayons I have, there are at most 30 distinct colours amongst them. To start colouring, I always take a sublist (see Q1 for a definition) of the crayons laid on the desk and put away the rest (too many options can be overwhelming and can lead to indecision). I take a look at the line art in front of me and wonder, “How many different colours do I need to make this look great? One? Two? Maybe three?”. Now you understand my dilemma and are fully aware of my indecision. You kindly decide to help me out by telling me for every number k, if I were to use…public static String pancakeScramble(String text) This nifty little problem is taken from the excellent Wolfram Challenges problem site where you can also see examples of what the result should be for various arguments. Given a text string, construct a new string by reversing its first two characters, then reversing the first three characters of that, and so on, until the last round where you reverse your entire current stringGiven 2 strings, return their concatenation, except remove the last character of each and swap the order of the inputted words. The strings will be at least length 3. Ex: If the input is: bird penguin the output is: pengiubir Ex: If the input is: loving csce the output is: csclovin
- 3. Write a program that transforms numbers 1, 2, 3,..., 12 into the corresponding month names January, February, March, ..., December. Hint: Make a very long string "January February March ...", in which you add spaces such that each month name has the same length. Then use substring to extract the month you want.1- Given an input consisting of one or more sets of strings, followed by a final line containing only the value 0. Each set starts with a line containing an integer, k, which is the number of strings in the set, followed by k strings, one per line. For example, if your input is: Input = { "7", "Bo", "Jean", "Marybeth", "Kevin", "Claude", "William", "Pat", "6", "Jim", "Ben", "Annabelle", "Zoe", "Joey", "Frederick", "5", "John", "Billy", "Fran", "Stant", "Cece", "2", "Jones", "Bibi", "0" } Your output should look like that: 2- Given the sorted input from question 1, write a new code such that the shorter strings go on the top and bottom and the longer strings sit in the middle. In other words, each pair of names belongs on opposite ends of the list, and the first name in the pair is always in the top part of the list. For example, in Set 1 below, Bob and Joe are the first pair, Jean and Kevin the second pair, etc. Your output should look like the sample below.…Exercise III: Catalan numbers For n e N, denote by c, to be the number of ways to form a "mountain range" with n upstrokes (U) and n downstrokes (D) that all stay above a horizontal line. For instance: for n = 1, only UD is allowed, so c = 1; • for n = 2, only UUDD and UDUD are allowed, so c2 = 2. 1. Check that c3 = 5 by writing down or drawing all possible options. 2. Consider the power series +00 g(x) = 2 n=0 (by definition co = 1) called the generating function of the sequence (en). Justify that cn < 4" for each n, and deduce that the radius of convergence of g is at least 1/4. 3. It can be show that for r E (-1/4, 1/4), g(x) = 1+ xg(r)? and therefore 1- VI 4.x g(x) = 2.x Use this formula and the known power series of V1+ x to write the first terms of the power series expansion of g, in the form g(x) = co + c1x + c2x2 + C3x + c4x* + ·.. Show how you obtain a few terms, but you do not need to show all computations and you can use a calculator for fractions. Check that you recover co,…