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leetcode-cn/problem (English)/去除重复字母(English) [remove-duplicate-letters].html
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<p>Given a string <code>s</code>, remove duplicate letters so that every letter appears once and only once. You must make sure your result is <strong>the smallest in lexicographical order</strong> among all possible results.</p>
<p>Given a string <code>s</code>, remove duplicate letters so that every letter appears once and only once. You must make sure your result is <span data-keyword="lexicographically-smaller-string"><strong>the smallest in lexicographical order</strong></span> among all possible results.</p>
<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>
<p><strong class="example">Example 1:</strong></p>
<pre>
<strong>Input:</strong> s = &quot;bcabc&quot;
<strong>Output:</strong> &quot;abc&quot;
</pre>
<p><strong>Example 2:</strong></p>
<p><strong class="example">Example 2:</strong></p>
<pre>
<strong>Input:</strong> s = &quot;cbacdcbc&quot;