Yoohoo 2018-04-15 20:49:31
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#include <iostream>
#include <algorithm>
#include <set>
#include <vector>
using namespace std;
int main()
{
int input_cnt;
set<int> st;
while (cin>> input_cnt)
{
st.clear();
while (input_cnt--)
{
int get_num;
cin >> get_num;
st.insert(get_num);
}
cout << st.size() << endl;
for (set<int>::iterator iter=st.begin(); iter != st.end(); iter++)
{
if (++iter == st.end())
{
--iter;
cout << *iter << endl;
}
else
{
--iter;
cout << *iter <<" ";///ends
}
}
}
return 0;
}