This program illustrates the use of the STL lexicographical_compare() algorithm
(extended version) to test whether a range of integers in one vector precedes,
in the lexicographical (dictionary) sense, another range of integers, in the
same vector, or in another vector. In this case, the integer values are ordered
in the sense that one integer precedes another if and only if the digit sum of
the first is less than the digit sum of the second.
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Here are the contents of v1:
21 13 7 53 46
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Here are the contents of v2:
12 22 16 35 55 1 2
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v1 precedes v2, in dictionary order.
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Here are the contents of v3:
12 22 16 35 54
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v1 does not precede v3, in dictionary order.
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Here are the contents of v4:
3 4 7 8 29
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v1 precedes v4, in dictionary order.
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