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leetcode-cn/problem (English)/判定字符是否唯一(English) [is-unique-lcci].html Normal file
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<p>Implement an algorithm to determine if a string has all unique characters. What if you cannot use additional data structures?</p>
<p><strong>Example 1:</strong></p>
<pre>
<strong>Input: </strong><code>s</code> = &quot;leetcode&quot;
<strong>Output: </strong>false
</pre>
<p><strong>Example 2:</strong></p>
<pre>
<strong>Input: </strong><code>s</code> = &quot;abc&quot;
<strong>Output: </strong>true
</pre>
<p>&nbsp;</p>
<p><strong>Note:</strong></p>
<ul>
<li><code>0 &lt;= len(s) &lt;= 100 </code></li>
</ul>