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20.有效的括号.py
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20.有效的括号.py
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#
# @lc app=leetcode.cn id=20 lang=python3
#
# [20] 有效的括号
#
# @lc code=start
class Solution:
def isValid(self, s: str) -> bool:
stack = []
for c in s:
if c == "(":
stack.append(")")
elif c == "{":
stack.append("}")
elif c == "[":
stack.append("]")
elif c == ")":
if len(stack) == 0:
return False
elif stack[-1] == ")":
stack.pop()
else:
return False
elif c == "}":
if len(stack) == 0:
return False
elif stack[-1] == "}":
stack.pop()
else:
return False
elif c == "]":
if len(stack) == 0:
return False
elif stack[-1] == "]":
stack.pop()
else:
return False
if len(stack) != 0:
return False
else:
return True
# @lc code=end