doubly linked list

팀 러버덕 by hoon

constructor

constructor

constructor

constructor

constructor

constructor

constructor

constructor

push

push

push

push

push

push

push

push

push

push

push

push

push

pop

pop

pop

pop

pop

pop

pop

pop

pop

pop

unshift

unshift

unshift

unshift

unshift

unshift

shift

shift

shift

shift

shift

shift

shift

shift

get

get

get

get

get

get

get

set

set

set

set

set

insert

insert

insert

insert

insert

insert

insert

insert

insert

insert

remove

remove

remove

remove

remove

remove

remove

remove

remove