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leetcode-cn/problem (Chinese)/判定字符是否唯一 [is-unique-lcci].html Normal file
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<p>实现一个算法，确定一个字符串 <code>s</code> 的所有字符是否全都不同。</p>
<p><strong>示例 1：</strong></p>
<pre><strong>输入:</strong> <code>s</code> = &quot;leetcode&quot;
<strong>输出:</strong> false
</pre>
<p><strong>示例 2：</strong></p>
<pre><strong>输入:</strong> <code>s</code> = &quot;abc&quot;
<strong>输出:</strong> true
</pre>
<p><strong>限制：</strong></p>
<ul>
<li><code>0 <= len(s) <= 100 </code></li>
<li>如果你不使用额外的数据结构，会很加分。</li>
</ul>