Array union X77575

Write a function that returns a sorted vector with the union of two sorted vectors v₁ and v₂. The result must have the elements in v₁ and the elements in v₂, without repetitions. For example, the union of a vector with 1, 2, 2, 5, 5, 7 and a vector with 2, 3, 3, 7 is a vector with 1, 2, 3, 5, 7.

Interface

Observation You only need to submit the required procedure; your main program will be ignored.