皮皮丶码

摘要： 20、Valid Parentheses Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input s 阅读全文

摘要： 14、Longest Common Prefix Write a function to find the longest common prefix string amongst an array of strings. If there is no common prefix, return a 阅读全文