This program illustrates the use of the STL inner_product() algorithm
(extended version) to compute the inner product of two ranges of integer
values from two vectors of integers. This time multiplication is replaced
by addition and addition by multiplication, so that intead of the "usual"
inner product, which is the sum of products, we have the product of sums.
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Here are the contents of v1:
2 1 4 3
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Here are the contents of v2:
1 2 3 4 5 6
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The inner product (product of sums, in this case) of the values in v1
with the values starting at the beginning of v2 is 441.
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The inner product (product of sums, in this case) of the last three values
of each vector is 405.
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