Материал из C\C++ эксперт
Use equal_range to determine lower and upper bound of a value in int Multiset
#include <iostream>
using std::cout;
using std::endl;
#include <set> // multiset class-template definition
#include <algorithm> // copy algorithm
#include <iterator> // ostream_iterator
int main()
{
int a[ 10 ] = { 7, 22, 9, 1, 18, 30, 100, 22, 85, 13 };
std::multiset< int, std::less< int > > intMultiset;
std::ostream_iterator< int > output( cout, " " );
// insert elements of array a into intMultiset
intMultiset.insert( a, a + 10 );
cout << "\nAfter insert, intMultiset contains:\n";
std::copy( intMultiset.begin(), intMultiset.end(), output );
// p represents pair of const_iterators
std::pair<std::multiset< int, std::less< int > >::const_iterator,
std::multiset< int, std::less< int > >::const_iterator > p;
//
p = intMultiset.equal_range( 22 );
cout << "\n\nequal_range of 22:" << "\n Lower bound: "
<< *( p.first ) << "\n Upper bound: " << *( p.second );
cout << endl;
return 0;
}
/*
After insert, intMultiset contains:
1 7 9 13 18 22 22 30 85 100
equal_range of 22:
Lower bound: 22
Upper bound: 30
*/
