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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.
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Agreed. Should be 4kyu.
check() takes no input and each boggle board is constructed with a char[][] board and a word to search for.
Please re-learn something about float-point numbers. If one computes x*x*x, it is still integer. Meanwhile, using Math.pow involves float-point numbers.
Math.pow seems to fail to find what we want if the numbers have too many digits. It sometimes meets problems about precisions.