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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.
建议检查下长度
if str2.matches('0').count() == str2.len() {
return 1;
}
当str2为'0000'或者大于1个'0'的时候会出错
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