[LeetCode] Valid Parenthesis String 验证括号字符串

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Given a string containing only three types of characters: ‘(‘, ‘)‘ and ‘*‘, write a function to check whether this string is valid. We define the validity of a string by these rules:

1. Any left parenthesis ‘(‘ must have a corresponding right parenthesis ‘)‘.
2. Any right parenthesis ‘)‘ must have a corresponding left parenthesis ‘(‘.
3. Left parenthesis ‘(‘ must go before the corresponding right parenthesis ‘)‘.
4. ‘*‘ could be treated as a single right parenthesis ‘)‘ or a single left parenthesis ‘(‘ or an empty string.
5. An empty string is also valid.

Example 1:

Input: "()"
Output: True

Example 2:

Input: "(*)"
Output: True

Example 3:

Input: "(*))"
Output: True

Note:

1. The string size will be in the range [1, 100].

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[LeetCode] Valid Parenthesis String 验证括号字符串

标签：type   code   nbsp   note   etc   output   rac   character   har   

原文地址：http://www.cnblogs.com/grandyang/p/7617017.html