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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.
actually needs to be obj[letter] = obj[letter] ? [index].concat(obj[letter]) : [index] to handle same consecutive letters
[ [ 7, 0, 0, 3, 8, 5, 0, 0, 0 ],
[ 3, 0, 0, 6, 0, 0, 5, 8, 0 ],
[ 5, 0, 0, 0, 0, 0, 7, 3, 6 ],
[ 0, 3, 7, 8, 1, 0, 9, 0, 0 ],
[ 9, 0, 2, 0, 0, 3, 1, 0, 8 ],
[ 0, 0, 6, 0, 5, 9, 0, 7, 0 ],
[ 8, 1, 0, 7, 0, 0, 0, 9, 0 ],
[ 0, 0, 0, 0, 6, 0, 0, 5, 7 ],
[ 0, 7, 0, 0, 0, 2, 0, 0, 4 ] ]
I pass all the tests except for this one. Why is this Sudoku 'not easy', in the position (3,0) the only possible option is 4, or am I missing something?
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