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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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This will return wrong answer if there're negative numbers in the array.
Problem statements says two "positive" numbers.
what if test case contains array like [1,1,2,2,2,3,3,3,2,2]
answer should be [1,2,3,2]
but uniq will give only [1,2,3]
press key "i" , then you can type.
its vim editor