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Data structure that keeps elements in chronological order and doesn't contain duplicates
I know that set doesn't contain duplicates, but it sorts the elements. I want a data structure that doesn't sort the elements and doesn't contain duplicates.
For example if the data structure contains ints,
Input: 5 4 1 2 5 4 9
Elements in data structure
5 4 1 2 9
Please help.
