set集中查找find

#include <iostream>
#include <set>

using namespace std;

typedef set<int> SETINT; // SETINT是别名，
int main()
{
SETINT a;
a.insert(67);
a.insert(7);
a.insert(-2);

SETINT::const_iterator i;
for (i = a.begin(); i != a.end(); ++i)
{
cout << *i << endl;
}
SETINT::iterator i_found = a.find(70);
if (i_found != a.end())
cout << "找到了，" << *i_found << endl;
else
cout << "没有找到，" << endl;

return 0;
}