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 ;}