Given an input string, delete recursively all the duplicate adjacent characters and return a string where all those adjacent characters that are the same have been reduced to just a single character.

Write a recursive function to recursively print the file list returned by os.listdir().

Construct recursive versions of the library functions that: a. calculate the "sum" of a list of numbers. b. "take" a given number of elements from the beginning of a list. c. select the "last" element of a non-empty list .

Write a Python recursive function called contains_vowel that, given a list of strings, returns True if every string in the list contains a vowel, and False otherwise. Here are some example inputs and outputs: ● contains_vowel([“garage”, “this”, “man”]) => True ● contains_vowel([“ffff”, “this”, “man”]) => False ● contains_vowel([]) => False Make sure your function handles any list of strings, and returns the appropriate response. There are no restrictions on the string or list methods that you can use. You may also write any helper functions if you choose.   The correctness tests total 24 points. Your function must be recursive in order to keep these correctness points. This means there should not be any loops in your solution.

Write a version of the binary search algorithm that can be used to search a list of strings. (Use the selection sort that you designed to sort the list.)

Given a string str and number n, write a program in JavaScript that recursively appends a copy of string str n times and returns the resulting string.