摘要： Leetcode里面关于字符串的一些问题，描述如下： Given an input string, reverse the string word by word. For example,Given s = "the sky is blue",return "blue is sky the". U 阅读全文

摘要： Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 注：直接看题目可能会有些偏差，因为容易认为　ne 阅读全文

摘要： Question: Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example, "A man, a plan, a 阅读全文