CompareBackspaceStrings app for iPhone and iPad

Given the two strings s and t, when they are input into a blank text editor, if they are equal, return true# Represents backspace characters; When participating in a game with the new "blackjack" rule and obtaining k or more points, she stops drawing numbers. What is the probability that the score does not exceed n? Given a positive integer n, returns the number of consecutive positive integers that satisfy the sum of all numbers as n; A function countUniqueChars (s) has been defined to count the unique characters in the string s and return the number of unique characters. The vastness and profoundness of mathematics require each of us to explore and practice more in order to create and explore more mysteries, opening up a brilliant path for everyone.