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31 lines
783 B
HTML
31 lines
783 B
HTML
<p>给定一个字符串，验证它是否是回文串，只考虑字母和数字字符，可以忽略字母的大小写。</p>
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<p><strong>说明：</strong>本题中，我们将空字符串定义为有效的回文串。</p>
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<p> </p>
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<p><strong>示例 1:</strong></p>
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<pre>
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<strong>输入:</strong> "A man, a plan, a canal: Panama"
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<strong>输出:</strong> true
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<strong>解释：</strong>"amanaplanacanalpanama" 是回文串
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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> "race a car"
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<strong>输出:</strong> false
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<strong>解释：</strong>"raceacar" 不是回文串
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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>1 <= s.length <= 2 * 10<sup>5</sup></code></li>
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<li>字符串 <code>s</code> 由 ASCII 字符组成</li>
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</ul>
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