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g0601_0700.s0678_valid_parenthesis_string.readme.md Maven / Gradle / Ivy

678\. Valid Parenthesis String

Medium

Given a string `s` containing only three types of characters: `'('`, `')'` and `'*'`, return `true` _if_ `s` _is **valid**_.

The following rules define a **valid** string:

*   Any left parenthesis `'('` must have a corresponding right parenthesis `')'`.
*   Any right parenthesis `')'` must have a corresponding left parenthesis `'('`.
*   Left parenthesis `'('` must go before the corresponding right parenthesis `')'`.
*   `'*'` could be treated as a single right parenthesis `')'` or a single left parenthesis `'('` or an empty string `""`.

**Example 1:**

**Input:** s = "()"

**Output:** true

**Example 2:**

**Input:** s = "(\*)"

**Output:** true

**Example 3:**

**Input:** s = "(\*))"

**Output:** true

**Constraints:**

*   `1 <= s.length <= 100`
*   `s[i]` is `'('`, `')'` or `'*'`.