code[vs] 1075 明明的随机数

#include <iostream>
#include <vector>
#include <set>
#include <algorithm>

using namespace std ;

int main()
{
int m ;
cin >> m ;
int in ;
set<int> num;
for ( int i = 0 ; i < m ; ++i)
{
cin >> in ;
num.insert(in);
}
cout << num.size() << endl;

set<int>::iterator it;
for ( it = num.begin();  it != num.end();++it)
cout << *it  << " " ;

cout << endl ;
return 0 ;
}