1,binary_search()  用法:http://www.sgi.com/tech/stl/binary_search.html

2,lower_bound()   用法:http://www.sgi.com/tech/stl/lower_bound.html

3,upper_bound() 用法:http://www.sgi.com/tech/stl/upper_bound.html

4,equal_range()  用法:http://www.sgi.com/tech/stl/equal_range.html

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