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小墨
2023-12-09 18:42:21 +08:00
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leetcode/problem/first-unique-character-in-a-string.html
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<p>Given a string <code>s</code>, <em>find the first non-repeating character in it and return its index</em>. If it does not exist, return <code>-1</code>.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<p><strong class="example">Example 1:</strong></p>
<pre><strong>Input:</strong> s = "leetcode"
<strong>Output:</strong> 0
</pre><p><strong>Example 2:</strong></p>
</pre><p><strong class="example">Example 2:</strong></p>
<pre><strong>Input:</strong> s = "loveleetcode"
<strong>Output:</strong> 2
</pre><p><strong>Example 3:</strong></p>
</pre><p><strong class="example">Example 3:</strong></p>
<pre><strong>Input:</strong> s = "aabb"
<strong>Output:</strong> -1
</pre>