Suppose we abstract our file system by a string in the following manner:
dir subdir1 subdir2 file.ext
dir contains an empty sub-directory
subdir1 and a sub-directory
subdir2 containing a file
dir subdir1 file1.ext subsubdir1 subdir2 subsubdir2 file2.ext
dir contains two sub-directories
subdir1 contains a file
file1.ext and an empty second-level sub-directory
subdir2 contains a second-level sub-directory
subsubdir2 containing a file
We are interested in finding the longest (number of characters) absolute path to a file within our file system. For example, in the second example above, the longest absolute path is
"dir/subdir2/subsubdir2/file2.ext", and its length is
32 (not including the double quotes).
Given a string representing the file system in the above format, return the length of the longest absolute path to file in the abstracted file system. If there is no file in the system, return
.and an extension.
Time complexity required:
n is the size of the input string.
a/aa/aaa/file1.txt is not the longest file path, if there is another path