This program illustrates the use of the STL merge() algorithm (extended
version) to merge two ordered ranges of integer values from two different
vectors of integers into a single ordered range of values within another
vector of integers. The order of values is determined by one value preceding
another if and only if the first has a smaller digit sum than the second.
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Here are the contents of v1:
11 41 45 59 98
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Here are the contents of v2:
121 13 6 52 44 36 28 69
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Here are the contents of v3:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
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Now merge the contents of v1 and v2 into v3.
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Here are the revised contents of v3:
11 121 13 41 6 52 44 45 36 28 59 69 98 0 0
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