This program illustrates the use of the STL equal_range() algorithm (default
version) to find the lower bound and upper bound locations of a given target
value in a vector of integers sorted in ascending order.
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Here are the contents of v:
2 3 5 6 7 7 7 8 9 10
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Lower bound of 3 in v = 3
Upper bound of 3 in v = 5
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Lower bound of 4 in v = 5
Upper bound of 4 in v = 5
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Lower bound of 5 in v = 5
Upper bound of 5 in v = 6
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Lower bound of 7 in v = 7
This is the first of the three 7's, since the value before this 7 is 6.
Upper bound of 7 in v = 8
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Lower bound of 0 in v = 2
Upper bound of 0 in v = 2
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Note that both the lower and upper bound locations
of 15 are the end (one-past-the-last) vector position.
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