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add leetcode problem-cn part6

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算法题（国内版）/problem (Chinese)/验证回文串 [valid-palindrome].html Normal file
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<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>
<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>
<p> </p>
<p><strong>示例 1:</strong></p>
<pre>
<strong>输入:</strong> "A man, a plan, a canal: Panama"
<strong>输出:</strong> true
<strong>解释：</strong>"amanaplanacanalpanama" 是回文串
</pre>
<p><strong>示例 2:</strong></p>
<pre>
<strong>输入:</strong> "race a car"
<strong>输出:</strong> false
<strong>解释：</strong>"raceacar" 不是回文串
</pre>
<p> </p>
<p><strong>提示：</strong></p>
<ul>
<li><code>1 <= s.length <= 2 * 10<sup>5</sup></code></li>
<li>字符串 <code>s</code> 由 ASCII 字符组成</li>
</ul>