C++ Tutorial/set multiset/multiset count — различия между версиями
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Текущая версия на 10:29, 25 мая 2010
Count elements in multiset by value
#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, " " );
cout << "There are currently " << intMultiset.count( 15 )
<< " values of 15 in the multiset\n";
intMultiset.insert( 15 );
intMultiset.insert( 15 );
cout << "After inserts, there are " << intMultiset.count( 15 )
<< " values of 15 in the multiset\n\n";
cout << endl;
return 0;
}There are currently 0 values of 15 in the multiset After inserts, there are 2 values of 15 in the multiset
Count the value in multiset
#include <iostream>
#include <set>
#include <algorithm>
using namespace std;
int main()
{
const int SIZE = 10;
int a[ SIZE ] = { 7, 22, 9, 1, 18, 30, 100, 22, 85, 13 };
typedef multiset< int, less< int > > ims;
ims intMultiset; // ims for "integer multiset"
cout << "There are currently " << intMultiset.count( 15 )
<< " values of 15 in the multiset\n";
return 0;
}multiset.count
#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, " " );
cout << "There are currently " << intMultiset.count( 15 )
<< " values of 15 in the multiset\n";
intMultiset.insert( 15 );
intMultiset.insert( 15 );
cout << "After inserts, there are " << intMultiset.count( 15 )
<< " values of 15 in the multiset\n\n";
cout << endl;
return 0;
}There are currently 0 values of 15 in the multiset After inserts, there are 2 values of 15 in the multiset
