![\"\"](\"https://assets.leetcode.com/uploads/2020/08/28/mdir.jpg\")
Suppose we have a file system that stores both files and directories. An example of one system is represented in the following picture:
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Here, we have dir as the only directory in the root. dir contains two subdirectories, subdir1 and subdir2. subdir1 contains a file file1.ext and subdirectory subsubdir1. subdir2 contains a subdirectory subsubdir2, which contains a file file2.ext.
In text form, it looks like this (with ⟶ representing the tab character):
\n\n\ndir\n⟶ subdir1\n⟶ ⟶ file1.ext\n⟶ ⟶ subsubdir1\n⟶ subdir2\n⟶ ⟶ subsubdir2\n⟶ ⟶ ⟶ file2.ext\n\n\n
If we were to write this representation in code, it will look like this: "dir\\n\\tsubdir1\\n\\t\\tfile1.ext\\n\\t\\tsubsubdir1\\n\\tsubdir2\\n\\t\\tsubsubdir2\\n\\t\\t\\tfile2.ext". Note that the '\\n' and '\\t' are the new-line and tab characters.
Every file and directory has a unique absolute path in the file system, which is the order of directories that must be opened to reach the file/directory itself, all concatenated by '/'s. Using the above example, the absolute path to file2.ext is "dir/subdir2/subsubdir2/file2.ext". Each directory name consists of letters, digits, and/or spaces. Each file name is of the form name.extension, where name and extension consist of letters, digits, and/or spaces.
Given a string input representing the file system in the explained format, return the length of the longest absolute path to a file in the abstracted file system. If there is no file in the system, return 0.
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Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2020/08/28/dir1.jpg\")
\n\nInput: input = "dir\\n\\tsubdir1\\n\\tsubdir2\\n\\t\\tfile.ext"\nOutput: 20\nExplanation: We have only one file, and the absolute path is "dir/subdir2/file.ext" of length 20.\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2020/08/28/dir2.jpg\")
\n\nInput: input = "dir\\n\\tsubdir1\\n\\t\\tfile1.ext\\n\\t\\tsubsubdir1\\n\\tsubdir2\\n\\t\\tsubsubdir2\\n\\t\\t\\tfile2.ext"\nOutput: 32\nExplanation: 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\n\n
Example 3:
\n\n\nInput: input = "a"\nOutput: 0\nExplanation: We do not have any files, just a single directory named "a".\n\n\n
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Constraints:
\n\n1 <= input.length <= 104input may contain lowercase or uppercase English letters, a new line character '\\n', a tab character '\\t', a dot '.', a space ' ', and digits.Compiled with clang 11 using the latest C++ 17 standard.
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