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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.
这么深的评论你也能找到，人才！
卧槽...
輸入範圍決定複雜度，這是常識吧 ;-)
如果是求任意一項排列的話也不需要暴力，可以O(n)解決
首页惊现中文评论。
你以为打拼音我就不认识了？
你说的是：居然是找规律，哼！Am I right? ;-)
The suggestion I can only give you is: Don't try to create an array of full permutation ;-)
Find a solvable way to solve it.