This program illustrates the use of the STL adjacent_find() algorithm
(default version) to find adjacent equal values in a vector of integers.
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Here are the values in the vector:
1 2 3 3 3 4 5 6 7 7 8 9
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First value of first matching pair is 3.
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First value of next matching pair is 3.
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First value of next matching pair is 7.
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There are no, or no more, matching pairs.
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