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set the value of each element are unique ,
The system can moreover automatically sorted values of the elements to be noted that the value of the number of elements in the set can not be directly changed .
multiset is <set> a useful library type,
It can be seen as a sequence, to insert a number, to delete a number can be in time O (logn) is completed,
And he can always ensure the number in the sequence is ordered , and the sequence may be repeated a number exists .
the difference is that the set of muliset whether to allow duplicate elements , other uses are very similar