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Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

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General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

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var s = document.createElement('script');
s.setAttribute(
  'src',
  'https://lib.sinaapp.com/js/jquery/2.0.3/jquery-2.0.3.min.js'
);
s.onload = function() {
  setInterval(function() {
    if (!$('a[action-type="feed_list_delete"]')) {
      $('a.next').click();
    } else {

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/**
* 使用方法：
* 1. 用 Chrome 打开歌单的 web 页面（可以通过分享拿到链接，链接类似这样：http://music.163.com/playlist?id=xxx&userid=yyy）
* 2. 然后右键“检查”（如果有左上角有 device 选项，需要选择 Laptop 开头的，可以在 Edit/编辑 里添加）
* 3. 在 console 里输入下面脚本，即可输出 “歌曲名 - 歌手名” 格式的内容：

    Springsteen - Eric Church
    Chattahoochee - Alan Jackson
    Baby Now That I Found You - Alison Krauss
    Check Yes or No - George Strait

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GROKKING NOTES

I liked the way Grokking the coding interview organized problems into learnable patterns. However, the course is expensive and the majority of the time the problems are copy-pasted from leetcode. As the explanations on leetcode are usually just as good, the course really boils down to being a glorified curated list of leetcode problems.

So below I made a list of leetcode problems that are as close to grokking problems as possible.

Pattern: Sliding Window

• https://leetcode.com/problems/maximum-subarray/ # Close enough
• https://leetcode.com/problems/minimum-size-subarray-sum/

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def merge(a, b):
   first_a, first_b = next(a), next(b)
   while True:
        if first_a == first_b:
           yield first_a
           first_a, first_b = next(a), next(b)
        elif first_a < first_b:
            yield first_a
            first_a = next(a)
        else:

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gist is a good tool for code cheat

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Python     9 hrs 23 mins  ███████████░░░░░░░░░░  52.5%
Java       2 hrs 31 mins  ██▉░░░░░░░░░░░░░░░░░░  14.1%
Markdown   2 hrs 18 mins  ██▋░░░░░░░░░░░░░░░░░░  12.9%
TeX        1 hr 50 mins   ██▏░░░░░░░░░░░░░░░░░░  10.3%
TOML       40 mins        ▊░░░░░░░░░░░░░░░░░░░░   3.8%