Design an Advanced File System
Solve a hard-level problem for developing a file system using tries.
Problem statement
Design a file system that allows the user to perform the following operations.
ls
: Allows the users to list all the files and folders present in a directory path. The function should take in the directory path as input and return a list of all files and folder names present in this directory.
mkdir
: Allows the users to create new directories. The function takes the directory name as the input and creates a new directory in the current directory.
pwd
: Returns the path to the present working directory.
cd
: Allows the users to enter a directory. The user cannot enter a file using this command.
touch
: Allows the user to create a new file in the current directory. If a file with the same name already exists in the directory, it shows an error.
Example
Sample input
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