{ "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:

\n\n

\"\"

\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.

\n\n

Note that the testcases are generated such that the file system is valid and no file or directory name has length 0.

\n\n

 

\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 subdir1 和 subdir2 。subdir1 包含文件 file1.ext 和子目录 subsubdir1；subdir2 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' 和 '\\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 的 绝对路径 是 \"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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            "isDailyQuestion": false,
            "dailyRecordStatus": null,
            "editorType": "CKEDITOR",
            "ugcQuestionId": null,
            "style": "LEETCODE",
            "exampleTestcases": "\"dir\\n\\tsubdir1\\n\\tsubdir2\\n\\t\\tfile.ext\"\n\"dir\\n\\tsubdir1\\n\\t\\tfile1.ext\\n\\t\\tsubsubdir1\\n\\tsubdir2\\n\\t\\tsubsubdir2\\n\\t\\t\\tfile2.ext\"\n\"a\"",
            "__typename": "QuestionNode"
        }
    }
}