ARTS-week-06

每周完成一个ARTS：每周至少做一个 leetcode 的算法题、阅读并点评至少一篇英文技术文章、学习至少一个技术技巧、分享一篇有观点和思考的技术文章。（也就是 Algorithm、Review、Tip、Share 简称ARTS）

1.Algorithm

Valid Parentheses

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

An input string is valid if:

Open brackets must be closed by the same type of brackets.
Open brackets must be closed in the correct order.

Note that an empty string is also considered valid.

Example 1:

1 2	Input: "()" Output: true

Example 2:

1 2	Input: "()[]{}" Output: true

Example 3:

1 2	Input: "(]" Output: false

Example 4:

1 2	Input: "([)]" Output: false

Example 5:

1 2	Input: "{[]}" Output: true

Code:

class Solution(object):
    def isValid(self, s):
        """
        :type s: str
        :rtype: bool
        """
        mapping = {
            '(': ')',
            '[': ']',
            '{': '}'
        }
        stack = []
        for c in s:
            if c in mapping:
                stack.append(c)
            else:
                if not stack or mapping[stack.pop()] != c:
                    return False
        return False if stack else True

2.Review

可以翻译，锻炼自己的阅读和英语能力。

英文文章可以去自己想要学习的技术官网获取，或者自己喜欢的公司 blog

An Introduction to Big Data Concepts and Terminology

系统概述了大数据行业及解释了相关术语

https://www.digitalocean.com/community/tutorials/an-introduction-to-big-data-concepts-and-terminology

3.Tip

生活技巧，学习技巧、工具

如何让Markdown另起一页

Markdown支持HTML语法

1	<div style="page-break-after: always;"></div>

ffmpeg简单使用(1)-转码、添加字幕

https://paranoid-kid.github.io/2019/04/30/ffmpeg简单使用-1/