leetcode-problemset/算法题（国外版）/delete-characters-to-make-fancy-string.html

<p>A <strong>fancy string</strong> is a string where no <strong>three</strong> <strong>consecutive</strong> characters are equal.</p>

<p>Given a string <code>s</code>, delete the <strong>minimum</strong> possible number of characters from <code>s</code> to make it <strong>fancy</strong>.</p>

<p>Return <em>the final string after the deletion</em>. It can be shown that the answer will always be <strong>unique</strong>.</p>

<p>&nbsp;</p>
<p><strong>Example 1:</strong></p>

<pre>
<strong>Input:</strong> s = &quot;le<u>e</u>etcode&quot;
<strong>Output:</strong> &quot;leetcode&quot;
<strong>Explanation:</strong>
Remove an &#39;e&#39; from the first group of &#39;e&#39;s to create &quot;leetcode&quot;.
No three consecutive characters are equal, so return &quot;leetcode&quot;.
</pre>

<p><strong>Example 2:</strong></p>

<pre>
<strong>Input:</strong> s = &quot;<u>a</u>aab<u>aa</u>aa&quot;
<strong>Output:</strong> &quot;aabaa&quot;
<strong>Explanation:</strong>
Remove an &#39;a&#39; from the first group of &#39;a&#39;s to create &quot;aabaaaa&quot;.
Remove two &#39;a&#39;s from the second group of &#39;a&#39;s to create &quot;aabaa&quot;.
No three consecutive characters are equal, so return &quot;aabaa&quot;.
</pre>

<p><strong>Example 3:</strong></p>

<pre>
<strong>Input:</strong> s = &quot;aab&quot;
<strong>Output:</strong> &quot;aab&quot;
<strong>Explanation:</strong> No three consecutive characters are equal, so return &quot;aab&quot;.
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= s.length &lt;= 10<sup>5</sup></code></li>
	<li><code>s</code> consists only of lowercase English letters.</li>
</ul>