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Algorithm_Python_2021/study/stack_queue/leet316_stack.py at master · SoniaComp/Algorithm_Python_2021 · GitHub
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Algorithm_Python_2021
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study
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stack_queue
/
leet316_stack.py
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Algorithm_Python_2021
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study
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stack_queue
/
leet316_stack.py
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import
collections
class
Solution
:
def
removeDuplicateLetters
(
self
,
s
:
str
)
->
str
:
counter
,
seen
,
stack
=
collections
.
Counter
(),
set
(), []
for
char
in
s
:
counter
[
char
]
-=
1
if
char
in
seen
:
continue
while
stack
and
char
<
stack
[
-
1
]
and
counter
[
stack
[
-
1
]]
>
0
:
seen
.
remove
(
stack
.
pop
())
stack
.
append
(
char
)
seen
.
add
(
char
)
return
''
.
joinn
(
stack
)
You can’t perform that action at this time.
