https://leetcode.com/problems/valid-parentheses/#/description
Given a string containing just the characters '('
, ')'
, '{'
, '}'
, '['
and ']'
, determine if the input string is valid.
The brackets must close in the correct order, "()"
and "()[]{}"
are all valid but "(]"
and "([)]"
are not.
Sol:
class Solution(object): def isValid(self, s): """ :type s: str :rtype: bool """ stack = [] dict = {"]":"[", "}":"{", ")":"("} for char in s: if char in dict.values(): stack.append(char) elif char in dict.keys(): if stack == [] or stack.pop() != dict[char]: return False else: return False return stack == []