Loading collection data...
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.
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投机取巧不可取啊，兄弟。我刚开始时也写了中算法，只有一个test没通过，我就知道逻辑有问题，全部推倒重新来过了。
Wow! clear recursion, nice recursion！
创建一个空的字符串数组，相当于
new String[]{}