摘要:
Calculate the sum of two integers a and b, but you are not allowed to use the operator + and -. Example:Given a = 1 and b = 2, return 3. 参考: http://bl 阅读全文
摘要:
Write a function that takes a string as input and returns the string reversed. Example:Given s = "hello", return "olleh". 阅读全文