{ "data": { "question": { "questionId": "388", "questionFrontendId": "388", "categoryTitle": "Algorithms", "boundTopicId": 1939, "title": "Longest Absolute File Path", "titleSlug": "longest-absolute-file-path", "content": "

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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\"\"

\n\n

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.

\n\n

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.

\n\n

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.

\n\n

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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\n

Example 1:

\n\"\"\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\"\"\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

 

\n

Constraints:

\n\n\n", "translatedTitle": "文件的最长绝对路径", "translatedContent": "

假设有一个同时存储文件和目录的文件系统。下图展示了文件系统的一个示例:

\n\n

\"\"

\n\n

这里将 dir 作为根目录中的唯一目录。dir 包含两个子目录 subdir1subdir2subdir1 包含文件 file1.ext 和子目录 subsubdir1subdir2 包含子目录 subsubdir2,该子目录下包含文件 file2.ext

\n\n

在文本格式中,如下所示(⟶表示制表符):

\n\n
\ndir\n⟶ subdir1\n⟶ ⟶ file1.ext\n⟶ ⟶ subsubdir1\n⟶ subdir2\n⟶ ⟶ subsubdir2\n⟶ ⟶ ⟶ file2.ext\n
\n\n

如果是代码表示,上面的文件系统可以写为 \"dir\\n\\tsubdir1\\n\\t\\tfile1.ext\\n\\t\\tsubsubdir1\\n\\tsubdir2\\n\\t\\tsubsubdir2\\n\\t\\t\\tfile2.ext\"'\\n''\\t' 分别是换行符和制表符。

\n\n

文件系统中的每个文件和文件夹都有一个唯一的 绝对路径 ,即必须打开才能到达文件/目录所在位置的目录顺序,所有路径用 '/' 连接。上面例子中,指向 file2.ext绝对路径\"dir/subdir2/subsubdir2/file2.ext\" 。每个目录名由字母、数字和/或空格组成,每个文件名遵循 name.extension 的格式,其中 name 和 extension由字母、数字和/或空格组成。

\n\n

给定一个以上述格式表示文件系统的字符串 input ,返回文件系统中 指向 文件 的 最长绝对路径 的长度 。 如果系统中没有文件,返回 0

\n\n

 

\n\n

示例 1:

\n\"\"\n
\n输入:input = \"dir\\n\\tsubdir1\\n\\tsubdir2\\n\\t\\tfile.ext\"\n输出:20\n解释:只有一个文件,绝对路径为 \"dir/subdir2/file.ext\" ,路径长度 20\n
\n\n

示例 2:

\n\"\"\n
\n输入:input = \"dir\\n\\tsubdir1\\n\\t\\tfile1.ext\\n\\t\\tsubsubdir1\\n\\tsubdir2\\n\\t\\tsubsubdir2\\n\\t\\t\\tfile2.ext\"\n输出:32\n解释:存在两个文件:\n\"dir/subdir1/file1.ext\" ,路径长度 21\n\"dir/subdir2/subsubdir2/file2.ext\" ,路径长度 32\n返回 32 ,因为这是最长的路径
\n\n

示例 3:

\n\n
\n输入:input = \"a\"\n输出:0\n解释:不存在任何文件
\n\n

示例 4:

\n\n
\n输入:input = \"file1.txt\\nfile2.txt\\nlongfile.txt\"\n输出:12\n解释:根目录下有 3 个文件。\n因为根目录中任何东西的绝对路径只是名称本身,所以答案是 \"longfile.txt\" ,路径长度为 12\n
\n\n

 

\n\n

提示:

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