This program illustrates the use of the STL find_first_of() algorithm (extended
version) to find the first occurrence of any one of a range of integer values
in a vector within another range of integer values, also in a vector, and where
corresponding values match if and only if they have the same digit sum.
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Here are the contents of v1:
17 5 13 21 6 7 8 14 9 10 11
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Here are the contents of v2:
12 41 19
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The first instance of a value in v2 matching a value in v1
happens at location 2.
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The next instance of a value in v2 matching a value in v1
happens at location 4.
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The next instance of a value in v2 matching a value in v1
happens at location 8.
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No further instance of a value in v2 matching a value in v1 was found.
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