longest-valid-parentheses

Longest Valid Parentheses

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longestValidParentheses

Given a string containing just the characters <code>&#39;(&#39;</code> and <code>&#39;)&#39;</code>, return the length of the longest valid (well-formed) parentheses substring.

&nbsp;
Example 1:

<pre>
Input: s = &quot;(()&quot;
Output: 2
Explanation: The longest valid parentheses substring is &quot;()&quot;.
</pre>

Example 2:

<pre>
Input: s = &quot;)()())&quot;
Output: 4
Explanation: The longest valid parentheses substring is &quot;()()&quot;.
</pre>

Example 3:

<pre>
Input: s = &quot;&quot;
Output: 0
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>0 &lt;= s.length &lt;= 3 * 104</code></li>
	<li><code>s[i]</code> is <code>&#39;(&#39;</code>, or <code>&#39;)&#39;</code>.</li>
</ul>

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