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42 lines
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42 lines
1.0 KiB
HTML
<p>给你一个只包含 <code>'('</code> 和 <code>')'</code> 的字符串，找出最长有效（格式正确且连续）括号 <span data-keyword="substring">子串</span> 的长度。</p>
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<p>左右括号匹配，即每个左括号都有对应的右括号将其闭合的字符串是格式正确的，比如 <code>"(()())"</code>。</p>
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<p> </p>
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<div class="original__bRMd">
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<div>
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<p><strong>示例 1：</strong></p>
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<pre>
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<strong>输入：</strong>s = "(()"
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<strong>输出：</strong>2
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<strong>解释：</strong>最长有效括号子串是 "()"
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</pre>
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<p><strong>示例 2：</strong></p>
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<pre>
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<strong>输入：</strong>s = ")()())"
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<strong>输出：</strong>4
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<strong>解释：</strong>最长有效括号子串是 "()()"
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</pre>
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<p><strong>示例 3：</strong></p>
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<pre>
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<strong>输入：</strong>s = ""
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<strong>输出：</strong>0
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</pre>
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li><code>0 <= s.length <= 3 * 10<sup>4</sup></code></li>
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<li><code>s[i]</code> 为 <code>'('</code> 或 <code>')'</code></li>
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</ul>
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</div>
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</div>
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