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leetcode-cn/problem (Chinese)/字符串中的第一个唯一字符 [first-unique-character-in-a-string].html Normal file
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<p>给定一个字符串&nbsp;<code>s</code>&nbsp;，找到 <em>它的第一个不重复的字符，并返回它的索引</em> 。如果不存在，则返回 <code>-1</code>&nbsp;。</p>
<p>&nbsp;</p>
<p><strong>示例 1：</strong></p>
<pre>
<strong>输入:</strong> s = "leetcode"
<strong>输出:</strong> 0
</pre>
<p><strong>示例 2:</strong></p>
<pre>
<strong>输入:</strong> s = "loveleetcode"
<strong>输出:</strong> 2
</pre>
<p><strong>示例 3:</strong></p>
<pre>
<strong>输入:</strong> s = "aabb"
<strong>输出:</strong> -1
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>
<li><code>s</code>&nbsp;只包含小写字母</li>
</ul>