This program illustrates the use of the STL set_intersection() algorithm
(default version) to find the values that are in a first vector of integers
and also in a second vector of integers, and write them out to a third vector
of integers.
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Here are the values in the vector v1:
11 12 12 12 12 13 14 15
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Here are the values in the vector v2:
11 12 12 13 13 16 17 18
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Here are the values in the vector v3:
101 102 103 104 105 106 107 108 109 110 111 112 113 114 115
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Now we find the values that are in v1 and also in v2, and
write them out to v3, starting at the beginning of v3.
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Here are the revised contents of v3:
11 12 12 13 105 106 107 108 109 110 111 112 113 114 115
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The iterator returned by the algorithm is pointing at the value 105.
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