leetcode/solution/0600-0699/0678.Valid Parenthesis String

678. Valid Parenthesis String

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Description

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].

Solutions

Python3

Java

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