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LeetCode-Solutions/Python/valid-parentheses.py at master · pythonpeixun/LeetCode-Solutions · GitHub
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LeetCode-Solutions
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Python
/
valid-parentheses.py
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14 lines (12 loc) · 401 Bytes
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LeetCode-Solutions
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Python
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valid-parentheses.py
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# Time: O(n)
# Space: O(n)
class
Solution
(
object
):
# @return a boolean
def
isValid
(
self
,
s
):
stack
,
lookup
=
[], {
"("
:
")"
,
"{"
:
"}"
,
"["
:
"]"
}
for
parenthese
in
s
:
if
parenthese
in
lookup
:
stack
.
append
(
parenthese
)
elif
len
(
stack
)
==
0
or
lookup
[
stack
.
pop
()]
!=
parenthese
:
return
False
return
len
(
stack
)
==
0
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