delete-characters-to-make-fancy-string

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Algorithms

A fancy string is a string where no three consecutive characters are equal.

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

Return the final string after the deletion. It can be shown that the answer will always be unique.

&nbsp;
Example 1:

<pre>
Input: s = &quot;leeetcode&quot;
Output: &quot;leetcode&quot;
Explanation:
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>

Example 2:

<pre>
Input: s = &quot;aaabaaaa&quot;
Output: &quot;aabaa&quot;
Explanation:
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>

Example 3:

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

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= s.length &lt;= 105</code></li>
	<li><code>s</code> consists only of lowercase English letters.</li>
</ul>