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一个热爱学习的 Java 程序员,喜欢 Vue,喜欢深度学习
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<span>32. Longest Valid Parentheses</span>
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32. Longest Valid Parentheses
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<ul>
<li><a target="_blank" rel="noopener" href="https://github.com/zdRan/leetcode">刷题仓库地址</a></li>
<li><a href="https://zdran.com/20180327.html">4. Median of Two Sorted Arrays</a></li>
<li><a href="https://zdran.com/20180328.html">10. Regular Expression Matching</a></li>
<li><a href="https://zdran.com/20180329.html">23. Merge k Sorted Lists</a></li>
<li><a href="https://zdran.com/20180330.html">25. Reverse Nodes in k-Group</a></li>
<li><a href="https://zdran.com/20180331.html">30. Substring with Concatenation of All Words</a></li>
<li><a href="https://zdran.com/20180401.html">32. Longest Valid Parentheses</a></li>
<li><a href="https://zdran.com/20190321.html">37. Sudoku Solver</a></li>
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<hr>
<h2 id="Description"><a href="#Description" class="headerlink" title="Description"></a>Description</h2><p>Given a string containing just the characters ‘(‘ and ‘)’, find the length of the longest valid (well-formed) parentheses substring.</p>
<p>For “(()”, the longest valid parentheses substring is “()”, which has length = 2.</p>
<h2 id="Example"><a href="#Example" class="headerlink" title="Example"></a>Example</h2><pre><code>Another example is ")()())",
where the longest valid parentheses substring is "()()",
which has length = 4.
</code></pre>
<h2 id="Translation"><a href="#Translation" class="headerlink" title="Translation"></a>Translation</h2><p>给定一个只包含字符’（’和’）’的字符串，找出最长有效（格式良好）的括号中的字符串的长度。 </p>
<p>对于“（（）”，最长的有效括号是“（）”，长度= 2。</p>
<h2 id="Ideas"><a href="#Ideas" class="headerlink" title="Ideas"></a>Ideas</h2><p>采用栈，判断栈顶元素与当前元素是否匹配，匹配成功则弹出，不成功则压入栈，入栈的是索引值，不是字符。</p>
<p>遇到 ‘(‘ 入栈索引值</p>
<p>遇到 ‘)’ 先出栈，</p>
<p>如果栈为空，直接入栈</p>
<p>如果栈不空，用当前索引减去栈顶索引，即得新的有效格式的长度。</p>
<h2 id="Accept-Code"><a href="#Accept-Code" class="headerlink" title="Accept Code"></a>Accept Code</h2><pre><code>public static int longestValidParentheses(String s) {
int ans = 0;
Stack<Integer> stack = new Stack<>();
stack.push(-1);
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (c == '(') {
stack.push(i);
} else {
stack.pop();
if (stack.empty()) {
stack.push(i);
} else {
ans = i - stack.peek() > ans ? i - stack.peek() : ans;
}
}
}
return ans;
}
</code></pre>
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