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leetcode-cn/problem (English)/自定义字符串排序(English) [custom-sort-string].html
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<p>You are given two strings order and s. All the characters of <code>order</code> are <strong>unique</strong> and were sorted in some custom order previously.</p>
<p>You are given two strings <code>order</code> and <code>s</code>. All the characters of <code>order</code> are <strong>unique</strong> and were sorted in some custom order previously.</p>
<p>Permute the characters of <code>s</code> so that they match the order that <code>order</code> was sorted. More specifically, if a character <code>x</code> occurs before a character <code>y</code> in <code>order</code>, then <code>x</code> should occur before <code>y</code> in the permuted string.</p>
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<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre>
<strong>Input:</strong> order = &quot;cba&quot;, s = &quot;abcd&quot;
<strong>Output:</strong> &quot;cbad&quot;
<strong>Explanation:</strong>
&quot;a&quot;, &quot;b&quot;, &quot;c&quot; appear in order, so the order of &quot;a&quot;, &quot;b&quot;, &quot;c&quot; should be &quot;c&quot;, &quot;b&quot;, and &quot;a&quot;.
Since &quot;d&quot; does not appear in order, it can be at any position in the returned string. &quot;dcba&quot;, &quot;cdba&quot;, &quot;cbda&quot; are also valid outputs.
</pre>
<div class="example-block" style="border-color: var(--border-tertiary); border-left-width: 2px; color: var(--text-secondary); font-size: .875rem; margin-bottom: 1rem; margin-top: 1rem; overflow: visible; padding-left: 1rem;">
<p><strong>Input: </strong> <span class="example-io" style="font-family: Menlo,sans-serif; font-size: 0.85rem;"> order = &quot;cba&quot;, s = &quot;abcd&quot; </span></p>
<p><strong>Output: </strong> <span class="example-io" style="font-family: Menlo,sans-serif; font-size: 0.85rem;"> &quot;cbad&quot; </span></p>
<p><strong>Explanation: </strong> <code>&quot;a&quot;</code>, <code>&quot;b&quot;</code>, <code>&quot;c&quot;</code> appear in order, so the order of <code>&quot;a&quot;</code>, <code>&quot;b&quot;</code>, <code>&quot;c&quot;</code> should be <code>&quot;c&quot;</code>, <code>&quot;b&quot;</code>, and <code>&quot;a&quot;</code>.</p>
<p>Since <code>&quot;d&quot;</code> does not appear in <code>order</code>, it can be at any position in the returned string. <code>&quot;dcba&quot;</code>, <code>&quot;cdba&quot;</code>, <code>&quot;cbda&quot;</code> are also valid outputs.</p>
</div>
<p><strong class="example">Example 2:</strong></p>
<pre>
<strong>Input:</strong> order = &quot;cbafg&quot;, s = &quot;abcd&quot;
<strong>Output:</strong> &quot;cbad&quot;
</pre>
<div class="example-block" style="border-color: var(--border-tertiary); border-left-width: 2px; color: var(--text-secondary); font-size: .875rem; margin-bottom: 1rem; margin-top: 1rem; overflow: visible; padding-left: 1rem;">
<p><strong>Input: </strong> <span class="example-io" style="font-family: Menlo,sans-serif; font-size: 0.85rem;"> order = &quot;bcafg&quot;, s = &quot;abcd&quot; </span></p>
<p><strong>Output: </strong> <span class="example-io" style="font-family: Menlo,sans-serif; font-size: 0.85rem;"> &quot;bcad&quot; </span></p>
<p><strong>Explanation: </strong> The characters <code>&quot;b&quot;</code>, <code>&quot;c&quot;</code>, and <code>&quot;a&quot;</code> from <code>order</code> dictate the order for the characters in <code>s</code>. The character <code>&quot;d&quot;</code> in <code>s</code> does not appear in <code>order</code>, so its position is flexible.</p>
<p>Following the order of appearance in <code>order</code>, <code>&quot;b&quot;</code>, <code>&quot;c&quot;</code>, and <code>&quot;a&quot;</code> from <code>s</code> should be arranged as <code>&quot;b&quot;</code>, <code>&quot;c&quot;</code>, <code>&quot;a&quot;</code>. <code>&quot;d&quot;</code> can be placed at any position since it&#39;s not in order. The output <code>&quot;bcad&quot;</code> correctly follows this rule. Other arrangements like <code>&quot;dbca&quot;</code> or <code>&quot;bcda&quot;</code> would also be valid, as long as <code>&quot;b&quot;</code>, <code>&quot;c&quot;</code>, <code>&quot;a&quot;</code> maintain their order.</p>
</div>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>