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for (iter = s.begin(); iter != s.end(); ++iter)
outf << *iter << endl;
#include <fstream>
#include <string>
uisng namespace std;
int main()
{
string date;
set<string> s;
set<string>::iterator iter;
ifstream inf("C:\\1.txt");
while (getline(inf, date))
{
s.insert(date);
}
inf.close();
ofstream outf;
outf.open("C:\\2.txt", fstream::out | fstream::app);
for (iter = s.begin(); iter != s.end(); ++iter)
{
outf << *iter << endl;
}
outf.close();
}