This program illustrates the use of the STL includes() algorithm (default
version) to test whether the values in a second (sorted) range of integer
values in a vector of integers are all present in a first (sorted) range
of integer values, also in a vector of integers.
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Here are the contents of v1:
1 2 4 8 16 32 64 128 256 512
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Here are the contents of v2:
2 16 128 512
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v1 includes v2.
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Here are the contents of v3:
2 16 128 1024
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v1 does not include v3.
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