File: root - text - article - 2019 - 10 - daily-problem-validate-balanced-parentheses.txt
Tags: 每日算法, 括号匹配, 面试, Python, daily problem, Validate Balanced Parentheses, algorithms, twitter interview question, python, | English | Home Page | Category: Computing | 450 Views, 22767 Search Bots | 161 Words
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Tags: 每日算法, 括号匹配, 面试, Python, daily problem, Validate Balanced Parentheses, algorithms, twitter interview question, python, | English | Home Page | Category: Computing | 450 Views, 22767 Search Bots | 161 Words
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Hi, here's your problem today. This problem was recently asked by Uber:
Imagine you are building a compiler. Before running any code, the compiler must check that the parentheses in the program are balanced. Every opening bracket must have a corresponding closing bracket. We can approximate this using strings.
Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
An input string is valid if:
- Open brackets are closed by the same type of brackets.
- Open brackets are closed in the correct order.
- Note that an empty string is also considered valid.
Example:
Input: "((()))"
Output: True
Input: "[()]{}"
Output: True
Input: "({[)]"
Output: False
Tags: 每日算法, 括号匹配, 面试, Python, daily problem, Validate Balanced Parentheses, algorithms, twitter interview question, python, | English | Home Page | Cateogry: Computing | 450 Views, 22767 Search Bots | 161 Words Imagine you are building a compiler. Before running any code, the compiler must check that the parentheses in the program are balanced. Every opening bracket must have a corresponding closing bracket. We can approximate this using strings.
Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
An input string is valid if:
- Open brackets are closed by the same type of brackets.
- Open brackets are closed in the correct order.
- Note that an empty string is also considered valid.
Example:
Input: "((()))"
Output: True
Input: "[()]{}"
Output: True
Input: "({[)]"
Output: False
class Solution:
def isValid(self, s):
# Fill this in.
# Test Program
s = "()(){(())"
# should return False
print(Solution().isValid(s))
s = ""
# should return True
print(Solution().isValid(s))
s = "([{}])()"
# should return True
print(Solution().isValid(s))
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