This program illustrates the use of the STL lexicographical_compare() algorithm
(default 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.
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Here are the contents of v1:
4 3 7 5 6
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Here are the contents of v2:
4 3 7 5 6 1 2
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v1 precedes v2, in dictionary order.
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Here are the contents of v3:
4 3 7 5 5
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v1 does not precede v3, in dictionary order.
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Here are the contents of v4:
4 3 7 5 7
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v1 precedes v4, in dictionary order.
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The first three values of v1 precede the last three, in dictionary order.
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