This program illustrates the use of the STL partial_sum() algorithm (default
version) from <numeric> to find the running totals of integer values stored in
a vector of integers and write those sums out to the same vector of integers.
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Here are the initial values in the vector:
1 2 3 4 5
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And here is the same vector after the partial sums
have been computed and the original values overwritten:
1 3 6 10 15
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The iterator p returned by the algorithm points to
the end of the ouput container.
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