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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.
this sign converts string value to number, example '1' (string) will be 1 (number)
The answer is 2 because you need to take the lowest value. It can't be 0 because the value can't start from 0 (?? !== 00). It can't be 1 because 1 is already exist in the expression. ??*1=??
All of the ?s in an expression will represent the same digit (0-9), and it won't be one of the other given digits in the expression