leetcode-problemset/leetcode/originData/crawler-log-folder.json

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            "title": "Crawler Log Folder",
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            "content": "<p>The Leetcode file system keeps a log each time some user performs a <em>change folder</em> operation.</p>\n\n<p>The operations are described below:</p>\n\n<ul>\n\t<li><code>&quot;../&quot;</code> : Move to the parent folder of the current folder. (If you are already in the main folder, <strong>remain in the same folder</strong>).</li>\n\t<li><code>&quot;./&quot;</code> : Remain in the same folder.</li>\n\t<li><code>&quot;x/&quot;</code> : Move to the child folder named <code>x</code> (This folder is <strong>guaranteed to always exist</strong>).</li>\n</ul>\n\n<p>You are given a list of strings <code>logs</code> where <code>logs[i]</code> is the operation performed by the user at the <code>i<sup>th</sup></code> step.</p>\n\n<p>The file system starts in the main folder, then the operations in <code>logs</code> are performed.</p>\n\n<p>Return <em>the minimum number of operations needed to go back to the main folder after the change folder operations.</em></p>\n\n<p>&nbsp;</p>\n<p><strong>Example 1:</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/09/09/sample_11_1957.png\" style=\"width: 775px; height: 151px;\" /></p>\n\n<pre>\n<strong>Input:</strong> logs = [&quot;d1/&quot;,&quot;d2/&quot;,&quot;../&quot;,&quot;d21/&quot;,&quot;./&quot;]\n<strong>Output:</strong> 2\n<strong>Explanation: </strong>Use this change folder operation &quot;../&quot; 2 times and go back to the main folder.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/09/09/sample_22_1957.png\" style=\"width: 600px; height: 270px;\" /></p>\n\n<pre>\n<strong>Input:</strong> logs = [&quot;d1/&quot;,&quot;d2/&quot;,&quot;./&quot;,&quot;d3/&quot;,&quot;../&quot;,&quot;d31/&quot;]\n<strong>Output:</strong> 3\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> logs = [&quot;d1/&quot;,&quot;../&quot;,&quot;../&quot;,&quot;../&quot;]\n<strong>Output:</strong> 0\n</pre>\n\n<p>&nbsp;</p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 &lt;= logs.length &lt;= 10<sup>3</sup></code></li>\n\t<li><code>2 &lt;= logs[i].length &lt;= 10</code></li>\n\t<li><code>logs[i]</code> contains lowercase English letters, digits, <code>&#39;.&#39;</code>, and <code>&#39;/&#39;</code>.</li>\n\t<li><code>logs[i]</code> follows the format described in the statement.</li>\n\t<li>Folder names consist of lowercase English letters and digits.</li>\n</ul>\n",
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            "hints": [
                "Simulate the process but don’t move the pointer beyond the main folder.",
                "Simulate the process but don’t move the pointer beyond the main folder."
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