冰凌花花～

摘要： Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack. 分析： 给出两个字符串，查询第二个字符串是否在第 阅读全文

摘要： Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring. For "(()", the lo 阅读全文