string-compression

String Compression

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compress

Given an array of characters <code>chars</code>, compress it using the following algorithm:

Begin with an empty string <code>s</code>. For each group of consecutive repeating characters in <code>chars</code>:

<ul>
	<li>If the group&#39;s length is <code>1</code>, append the character to <code>s</code>.</li>
	<li>Otherwise, append the character followed by the group&#39;s length.</li>
</ul>

The compressed string <code>s</code> should not be returned separately, but instead, be stored in the input character array <code>chars</code>. Note that group lengths that are <code>10</code> or longer will be split into multiple characters in <code>chars</code>.

After you are done modifying the input array, return the new length of the array.

You must write an algorithm that uses only constant extra space.

&nbsp;
Example 1:

<pre>
Input: chars = [&quot;a&quot;,&quot;a&quot;,&quot;b&quot;,&quot;b&quot;,&quot;c&quot;,&quot;c&quot;,&quot;c&quot;]
Output: Return 6, and the first 6 characters of the input array should be: [&quot;a&quot;,&quot;2&quot;,&quot;b&quot;,&quot;2&quot;,&quot;c&quot;,&quot;3&quot;]
Explanation: The groups are &quot;aa&quot;, &quot;bb&quot;, and &quot;ccc&quot;. This compresses to &quot;a2b2c3&quot;.
</pre>

Example 2:

<pre>
Input: chars = [&quot;a&quot;]
Output: Return 1, and the first character of the input array should be: [&quot;a&quot;]
Explanation: The only group is &quot;a&quot;, which remains uncompressed since it&#39;s a single character.
</pre>

Example 3:

<pre>
Input: chars = [&quot;a&quot;,&quot;b&quot;,&quot;b&quot;,&quot;b&quot;,&quot;b&quot;,&quot;b&quot;,&quot;b&quot;,&quot;b&quot;,&quot;b&quot;,&quot;b&quot;,&quot;b&quot;,&quot;b&quot;,&quot;b&quot;]
Output: Return 4, and the first 4 characters of the input array should be: [&quot;a&quot;,&quot;b&quot;,&quot;1&quot;,&quot;2&quot;].
Explanation: The groups are &quot;a&quot; and &quot;bbbbbbbbbbbb&quot;. This compresses to &quot;ab12&quot;.</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= chars.length &lt;= 2000</code></li>
	<li><code>chars[i]</code> is a lowercase English letter, uppercase English letter, digit, or symbol.</li>
</ul>

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