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"content": "<p>Suppose we have a file system that stores both files and directories. An example of one system is represented in the following picture:</p>\n\n<p><img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/08/28/mdir.jpg\" style=\"width: 681px; height: 322px;\" /></p>\n\n<p>Here, we have <code>dir</code> as the only directory in the root. <code>dir</code> contains two subdirectories, <code>subdir1</code> and <code>subdir2</code>. <code>subdir1</code> contains a file <code>file1.ext</code> and subdirectory <code>subsubdir1</code>. <code>subdir2</code> contains a subdirectory <code>subsubdir2</code>, which contains a file <code>file2.ext</code>.</p>\n\n<p>In text form, it looks like this (with ⟶ representing the tab character):</p>\n\n<pre>\ndir\n⟶ subdir1\n⟶ ⟶ file1.ext\n⟶ ⟶ subsubdir1\n⟶ subdir2\n⟶ ⟶ subsubdir2\n⟶ ⟶ ⟶ file2.ext\n</pre>\n\n<p>If we were to write this representation in code, it will look like this: <code>"dir\\n\\tsubdir1\\n\\t\\tfile1.ext\\n\\t\\tsubsubdir1\\n\\tsubdir2\\n\\t\\tsubsubdir2\\n\\t\\t\\tfile2.ext"</code>. Note that the <code>'\\n'</code> and <code>'\\t'</code> are the new-line and tab characters.</p>\n\n<p>Every file and directory has a unique <strong>absolute path</strong> in the file system, which is the order of directories that must be opened to reach the file/directory itself, all concatenated by <code>'/'s</code>. Using the above example, the <strong>absolute path</strong> to <code>file2.ext</code> is <code>"dir/subdir2/subsubdir2/file2.ext"</code>. Each directory name consists of letters, digits, and/or spaces. Each file name is of the form <code>name.extension</code>, where <code>name</code> and <code>extension</code> consist of letters, digits, and/or spaces.</p>\n\n<p>Given a string <code>input</code> representing the file system in the explained format, return <em>the length of the <strong>longest absolute path</strong> to a <strong>file</strong> in the abstracted file system</em>. If there is no file in the system, return <code>0</code>.</p>\n\n<p> </p>\n<p><strong>Example 1:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/08/28/dir1.jpg\" style=\"width: 401px; height: 202px;\" />\n<pre>\n<strong>Input:</strong> input = "dir\\n\\tsubdir1\\n\\tsubdir2\\n\\t\\tfile.ext"\n<strong>Output:</strong> 20\n<strong>Explanation:</strong> We have only one file, and the absolute path is "dir/subdir2/file.ext" of length 20.\n</pre>\n\n<p><strong>Example 2:</strong></p>\n<img alt=\"\" src=\"https://assets.leetcode.com/uploads/2020/08/28/dir2.jpg\" style=\"width: 641px; height: 322px;\" />\n<pre>\n<strong>Input:</strong> input = "dir\\n\\tsubdir1\\n\\t\\tfile1.ext\\n\\t\\tsubsubdir1\\n\\tsubdir2\\n\\t\\tsubsubdir2\\n\\t\\t\\tfile2.ext"\n<strong>Output:</strong> 32\n<strong>Explanation:</strong> We have two files:\n"dir/subdir1/file1.ext" of length 21\n"dir/subdir2/subsubdir2/file2.ext" of length 32.\nWe return 32 since it is the longest absolute path to a file.\n</pre>\n\n<p><strong>Example 3:</strong></p>\n\n<pre>\n<strong>Input:</strong> input = "a"\n<strong>Output:</strong> 0\n<strong>Explanation:</strong> We do not have any files, just a single directory named "a".\n</pre>\n\n<p> </p>\n<p><strong>Constraints:</strong></p>\n\n<ul>\n\t<li><code>1 <= input.length <= 10<sup>4</sup></code></li>\n\t<li><code>input</code> may contain lowercase or uppercase English letters, a new line character <code>'\\n'</code>, a tab character <code>'\\t'</code>, a dot <code>'.'</code>, a space <code>' '</code>, and digits.</li>\n</ul>\n",
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