题解 | #有效括号序列#
有效括号序列
https://www.nowcoder.com/practice/37548e94a270412c8b9fb85643c8ccc2
class Solution:
def isValid(self , s: str) -> bool:
# write code here
def pair(char):
if char == '}':
return '{'
elif char == ']':
return '['
elif char == ')':
return '('
stack = []
for x in s:
if pair(x) in stack:
stack.pop()
else:
stack.append(x)
return not stack
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