leetcode-problemset/leetcode/problem/making-file-names-unique.html

<p>Given an array of strings <code>names</code> of size <code>n</code>. You will create <code>n</code> folders in your file system <strong>such that</strong>, at the <code>i<sup>th</sup></code> minute, you will create a folder with the name <code>names[i]</code>.</p>

<p>Since two files <strong>cannot</strong> have the same name, if you enter a folder name that was previously used, the system will have a suffix addition to its name in the form of <code>(k)</code>, where, <code>k</code> is the <strong>smallest positive integer</strong> such that the obtained name remains unique.</p>

<p>Return <em>an array of strings of length </em><code>n</code> where <code>ans[i]</code> is the actual name the system will assign to the <code>i<sup>th</sup></code> folder when you create it.</p>

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

<pre>
<strong>Input:</strong> names = [&quot;pes&quot;,&quot;fifa&quot;,&quot;gta&quot;,&quot;pes(2019)&quot;]
<strong>Output:</strong> [&quot;pes&quot;,&quot;fifa&quot;,&quot;gta&quot;,&quot;pes(2019)&quot;]
<strong>Explanation:</strong> Let&#39;s see how the file system creates folder names:
&quot;pes&quot; --&gt; not assigned before, remains &quot;pes&quot;
&quot;fifa&quot; --&gt; not assigned before, remains &quot;fifa&quot;
&quot;gta&quot; --&gt; not assigned before, remains &quot;gta&quot;
&quot;pes(2019)&quot; --&gt; not assigned before, remains &quot;pes(2019)&quot;
</pre>

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

<pre>
<strong>Input:</strong> names = [&quot;gta&quot;,&quot;gta(1)&quot;,&quot;gta&quot;,&quot;avalon&quot;]
<strong>Output:</strong> [&quot;gta&quot;,&quot;gta(1)&quot;,&quot;gta(2)&quot;,&quot;avalon&quot;]
<strong>Explanation:</strong> Let&#39;s see how the file system creates folder names:
&quot;gta&quot; --&gt; not assigned before, remains &quot;gta&quot;
&quot;gta(1)&quot; --&gt; not assigned before, remains &quot;gta(1)&quot;
&quot;gta&quot; --&gt; the name is reserved, system adds (k), since &quot;gta(1)&quot; is also reserved, systems put k = 2. it becomes &quot;gta(2)&quot;
&quot;avalon&quot; --&gt; not assigned before, remains &quot;avalon&quot;
</pre>

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

<pre>
<strong>Input:</strong> names = [&quot;onepiece&quot;,&quot;onepiece(1)&quot;,&quot;onepiece(2)&quot;,&quot;onepiece(3)&quot;,&quot;onepiece&quot;]
<strong>Output:</strong> [&quot;onepiece&quot;,&quot;onepiece(1)&quot;,&quot;onepiece(2)&quot;,&quot;onepiece(3)&quot;,&quot;onepiece(4)&quot;]
<strong>Explanation:</strong> When the last folder is created, the smallest positive valid k is 4, and it becomes &quot;onepiece(4)&quot;.
</pre>

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

<ul>
	<li><code>1 &lt;= names.length &lt;= 5 * 10<sup>4</sup></code></li>
	<li><code>1 &lt;= names[i].length &lt;= 20</code></li>
	<li><code>names[i]</code> consists of lowercase English letters, digits, and/or round brackets.</li>
</ul>