Use Java pls I'll upvote:

Please simulate and implement a simple file system

$$ FileSystem$()$: System initialization, currently in the directory $/,$ the root directory is empty

$$ makeDir$($string dirName$)$: Create a new directory in the current directory, if the directory name dirName is the same as the current directory

If the file or directory name in the previous directory is repeated, the creation fails and false is returned. Otherwise, the creation is successful and true.

$$ createFile $($string filename$)$: Create a new file in the current directory, if the file name fileName and

If the file name or directory name in the current directory is repeated, the creation will fail and return false, else true

$$ change Dir $($string pathname$)$ switches the current directory to pathName: First, if pathName is $"",$

The current directory remains unchanged and returns true; if the directory exists, the switch returns true, otherwise false

$$ remove $($string name$)$ deletes the file or directory named name in the current directory: if it exists, delete it$.$

Function, true, otherwise false is returned directly $($deleting a directory requires recursively deleting all files in the directory$)$

$$ listDir: Returns the directories and files in the current directory, with the directories in front and files in the back, in dictionary order.

$($The returned results do not include content in subdirectories$)$ Sort by ascii

answer requests

Time limit: $1000$ms$,$ memory limit: $256$M

Input

Each line represents a function call. The initialization function is only called once in the first line, and the cumulative function calls do not exceed $1,000$ times.

fileName, dirName, name contain only lowercase letters, and the length range is $[1,100]$

pathName only contains lowercase letters and $/,0<=$ pathName.length $<1000,$ Note: does not contain $..$ or $.$

Note: When pathName is not $"",$ it is a legal directory name, and may have a $/$ at the end.

output

When answering questions, implement it according to the requirements in the function$/$method prototype $($including return value$),$ and the output is completed by the framework $($the first line

fixed output null$)$

Example:

Input sample $1$:

FileSystem$()$

makeDir$($dirc$)$

makeDir$($dirb$)$

makeDir$($dirc$)$

listDir$()$

changeDir$($dirc$/)$

createFile$($fileb$)$

makeDir$($dirb$)$

createFile$($dirb$)$

listDir$()$

changeDir$(/$dirb$/$dirc$)$

Output sample $1$:

null

true

true

false

$[$dirb$,$dirc$]$

true

true

true

false

$[$dirb$,$fileb$]$

false

Tip sample $1$:

FileSystem$()//$null

makeDir$("$dirc$")//$true

makeDir$("$dirb$")//$true

makeDir$("$dirc$")//$false$,$ repeat

listDir$()//["$dirb$",$ "dirc"$],$ note: do not add extra $/$ at the end of the directory name

changeDir$("$dirc$/")//$true$,$ with a $/$ at the end, which is equivalent to the directory dirc

createFile$("$fileb$")//$true

makeDir$("$dirb$")//$true

createFile$("$dirb$")//$false$,$ repeat

listDir$()//["$dirb$",$"fileb"$]$

changeDir$("/$dirb$/$dirc$")//$false$,$ the directory does not exist

Input sample $2$:

FileSystem$()$

listDir$()$

changeDir$()$

createFile$($gateway$)$

makeDir$($home$)$

changeDir$($gateway$)$

makeDir$($etc$)$

lisrDir$()$

remove$($gateway$)$

changeDir$($etc$/)$

createFile$($pip$)$

changeDir$(/$etc$/)$

lisrDir$()$

changeDir$(/)$

remove$($etc$)$

listDir$()$

Output sample $2$:

null

$[]$

true

true

true

false

true

$[$etc$,$home$,$gateway$]$

true

true

true

true

$[$pip$]$

true

true

$[$home$]$

Tip sample $2$:

FileSystem$()$

listDir$()//$The query content at this time is $[]$

changeDir$("")//$ pathName is $"",$ the current directory remains unchanged, returns true

$...$

changeDir$("$gateway$")//$The file gateway exists in the current directory, but it is not a directory, so switch the directory

Recording failed.

makeDir$("$etc$")$

listDir$()//$ When returning, the directories home and etc are at the front, and the file gateway is at the back; the directories are etc in ascending dictionary order.

and home.

$...$

remove$("$etc$")//$ Currently in the root directory, delete the directory etc under it$,$ and all subdirectories and files under etc

$...$

Tips:

$//$ Initialization and calling reference $($take C as an example, refer to other languages$)$:

FileSystem $*$sys $=$ FileSystemCreate$()$;

bool param$\_1=$ FileSystemMakeDir$($sys$,$dirName$)$;

bool param$\_2=$ FileSystemCreateFile$($sys$,$fileName$)$;

bool param$\_3=$ FileSystemChangeDir$($sys$,$pathName$)$;

bool param$\_4=$ FileSystemRemove$($sys$,$name$)$;

char $**$param$\_5=$ FileSystemListDir$($sys$,$&returnValSize$)$;

FileSystemFree$($sys$)$;

Dictionary order: refers to a method of sorting words according to the order in which they appear in the dictionary. First, according to the first character, $0,1,$

$2..\mathrm{.}9,$ compare the ASCII code values $$of a$,$ b$,$ c$...$z$,$ etc., and the smaller one will be ranked first; if the first character is the same, then compare the first character

The second, third and even subsequent characters. If the last two words are not the same length $($such as sigh and sight, $0312$

and $03121),$ then the shorter one is ranked first.