388. Longest Absolute File Path
Description
Suppose we have a file system that stores both files and directories. An example of one system is represented in the following picture:
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):
dir ⟶ subdir1 ⟶ ⟶ file1.ext ⟶ ⟶ subsubdir1 ⟶ subdir2 ⟶ ⟶ subsubdir2 ⟶ ⟶ ⟶ file2.ext
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
.
Note that the testcases are generated such that the file system is valid and no file or directory name has length 0.
Example 1:
![](https://spcdn.pages.dev/leetcode/problems/0388.Longest%20Absolute%20File%20Path/images/dir1.jpg)
Input: input = "dir\n\tsubdir1\n\tsubdir2\n\t\tfile.ext" Output: 20 Explanation: We have only one file, and the absolute path is "dir/subdir2/file.ext" of length 20.
Example 2:
![](https://spcdn.pages.dev/leetcode/problems/0388.Longest%20Absolute%20File%20Path/images/dir2.jpg)
Input: input = "dir\n\tsubdir1\n\t\tfile1.ext\n\t\tsubsubdir1\n\tsubdir2\n\t\tsubsubdir2\n\t\t\tfile2.ext" Output: 32 Explanation: We have two files: "dir/subdir1/file1.ext" of length 21 "dir/subdir2/subsubdir2/file2.ext" of length 32. We return 32 since it is the longest absolute path to a file.
Example 3:
Input: input = "a" Output: 0 Explanation: We do not have any files, just a single directory named "a".
Constraints:
1 <= input.length <= 104
input
may contain lowercase or uppercase English letters, a new line character'\n'
, a tab character'\t'
, a dot'.'
, a space' '
, and digits.- All file and directory names have positive length.
Solutions
Solution 1
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