set集的删除

#include <iostream>
#include <set>

using namespace std;

typedef multiset<int> MSETINT; // MSETINT是别名，
int main()
{
	MSETINT a;
	a.insert(67);
	a.insert(7);
	a.insert(-2);
	a.insert(20);
	a.insert(50);
    
	MSETINT::const_iterator i;
	cout << "multiset里有" << a.size() << "个数据。" << endl;
	cout << "每个数据是：" << endl;
	for (i = a.begin(); i != a.end(); ++i)
	{
		cout << *i << endl;
	}
	int nNumberToErase = 0;
	cin >> nNumberToErase;

	a.erase(nNumberToErase);
	cout << "删除后：" << endl;
	cout << "multiset里有" << a.size() << "个数据。" << endl;
	cout << "每个数据是：" << endl;
	for (i = a.begin(); i != a.end(); ++i)
	{
		cout << *i << endl;
	}


	return 0;
}