摘要： 题目： Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 简单题。 阅读全文

摘要： 题目： Write a function that takes a string as input and returns the string reversed. Example:Given s = "hello", return "olleh". 应该说还是比较简单的。 阅读全文

摘要： 题目： 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:Give 阅读全文