This program illustrates the use of the STL unique_copy() algorithm
(extended version) to remove adjacent duplicate copies of integer values
divisible by 3 from a vector of integers, and simultaneously copy the
remaining values to another vector.
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Here are the values in the source vector:
1 2 2 3 3 6 5 2 6 9 12 2 2 2 9 10 11 12
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Here are the values in the destination vector:
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
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Now we remove all adjacent duplicate copies of any  values divisible by 3
from the source vector and copy the remaining values to the destination
vector, starting at the third value in that destination vector.
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Here are the (unchanged) source vector values:
1 2 2 3 3 6 5 2 6 9 12 2 2 2 9 10 11 12
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And here are the destination vector values:
21 22 1 2 2 3 5 2 6 2 2 2 9 10 11 12 37 38
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The iterator returned by the call to unique_copy() is pointing to the value 37.
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