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// set::empty
#include <iostream>
#include <set>
int main ()
{
std::set<int> myset;
myset.insert(20);
myset.insert(30);
myset.insert(10);
std::cout << "myset contains:";
while (!myset.empty())
{
std::cout << ' ' << *myset.begin();
myset.erase(myset.begin());
}
std::cout << '\n';
return 0;
}
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