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python">def isValid(s):stack = []mapping = {')': '(', '}': '{', ']': '['}for char in s:if char in mapping:top_element = stack.pop() if stack else '#'if mapping[char] != top_element:return Falseelse:stack.append(char)return not stack# 测试
s = "()[]{}"
if isValid(s):print("字符串有效")
else:print("字符串无效")