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LeetCode-Solutions/Python/validate-stack-sequences.py at master · fileset/LeetCode-Solutions · GitHub
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LeetCode-Solutions
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Python
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validate-stack-sequences.py
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LeetCode-Solutions
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Python
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validate-stack-sequences.py
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# Time: O(n)
# Space: O(n)
class
Solution
(
object
):
def
validateStackSequences
(
self
,
pushed
,
popped
):
"""
:type pushed: List[int]
:type popped: List[int]
:rtype: bool
"""
i
=
0
s
=
[]
for
v
in
pushed
:
s
.
append
(
v
)
while
s
and
i
<
len
(
popped
)
and
s
[
-
1
]
==
popped
[
i
]:
s
.
pop
()
i
+=
1
return
i
==
len
(
popped
)
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