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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
聪明的方法，我竟没想到在这里可以用 字符串的替代 。我喜欢这个方法。
今天又学到了！
以 www 结尾的域名会出错，例如："http://www.googlewww.com"
我认为用正则表达式更好
整洁、易懂，和这个程序比较，我写的程序太糟糕了、太累赘了。
今天又学到了！
抓住了问题的本质，找最大的子数组和，输出为最大就行，但看不到找的轨迹。就结果而言，做法很聪明。
又学到了！
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