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"question": {
"questionId": "1000254",
"questionFrontendId": "剑指 Offer II 018",
"categoryTitle": "LCOF2",
"boundTopicId": 910257,
"title": "有效的回文",
"titleSlug": "XltzEq",
"content": "<p>English description is not available for the problem. Please switch to Chinese.</p>\n",
"translatedTitle": "有效的回文",
"translatedContent": "<p>给定一个字符串 <code>s</code> ,验证 <code>s</code>&nbsp;是否是&nbsp;<strong>回文串&nbsp;</strong>,只考虑字母和数字字符,可以忽略字母的大小写。</p>\n\n<p>本题中,将空字符串定义为有效的&nbsp;<strong>回文串&nbsp;</strong>。</p>\n\n<p>&nbsp;</p>\n\n<p><strong>示例 1:</strong></p>\n\n<pre>\n<strong>输入: </strong>s =<strong> </strong>&quot;A man, a plan, a canal: Panama&quot;\n<strong>输出:</strong> true\n<strong>解释:</strong>&quot;amanaplanacanalpanama&quot; 是回文串</pre>\n\n<p><strong>示例 2:</strong></p>\n\n<pre>\n<strong>输入:</strong> s = &quot;race a car&quot;\n<strong>输出:</strong> false\n解释&quot;raceacar&quot; 不是回文串</pre>\n\n<p>&nbsp;</p>\n\n<p><strong>提示:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= s.length &lt;= 2 * 10<sup>5</sup></code></li>\n\t<li>字符串 <code>s</code> 由 ASCII 字符组成</li>\n</ul>\n\n<p>&nbsp;</p>\n\n<p><meta charset=\"UTF-8\" />注意:本题与主站 125&nbsp;题相同:&nbsp;<a href=\"https://leetcode-cn.com/problems/valid-palindrome/\">https://leetcode-cn.com/problems/valid-palindrome/</a></p>\n",
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