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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.
That is not at all clever nor best practice as he added true:false in the end that does absolutely nothing lmao.
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This comment is hidden because it contains spoiler information about the solution
字符型和数字进行加减运算，字符会隐式转换为ASCII码值，我想你应该问的是这个;-)
i am sorry for this silly question
s.charAt(i) would return a char value, why would you add (char) ?