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set<int> A, B;
for (int i = 0; i < 100; i++) A.insert(i);
for (int i = 50; i < 150; i++) B.insert(i);
How to add elements of set B to the set A?
In another words, how to implement A = Union(A, B)?
By default sets are unique values only and sorted so inserting the iterator range should work: