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template <class ForIter, class T> pair<ForIter, ForIter> equal_range(ForIter start, ForIter end, const T &val); template <class ForIter, class T, class Comp> pair<ForIter, ForIter> equal_range(ForIter start, ForIter end, const T &val, Comp cmpfn);
The equal_range( ) algorithm returns a range in which an element can be inserted into a sequence without disrupting the ordering of the sequence. The region in which to search for such a range is specified by start and end. The value is passed in val. To specify your own search criteria, specify the comparison function cmpfn.
The template class pair is a utility class that can hold a pair of objects in its first and second members.
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