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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.
well gooooooooood for you
probably not...From experience lot of interview problems resemble leetcode or hackerrank style of problems although every site has an overlap of problems.
it was kind of my first Kata, and first program in Java (not counting Hello World!) :D
yup, took me 2hrs, but I was working with a mentor