摘要：
Write a function that takes a string as input and reverse only the vowels of a string. Example 1:Given s = "hello", return "holle". Example 2:Given s 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". 第一次使用的是string来做，从后往前遍历输入的str 阅读全文