Question(1): You are given a string representing a Roman numeral (e.g., "XIV"). Write a function that converts it into its corresponding integer.
Question(2): You are given an array of prices where prices[i] represents the stock price on day i. Write a function to determine the maximum profit that can be achieved by buying on one day and selling on another later day.
Question(3): Write a function that determines if a given string is a palindrome. A palindrome reads the same backward as forward.