#include<set>
#include<vector>
#include<iostream>
using namespace std;


int main()
{
vector<int> vec;
vec = { 1, 2, 3, 4, 8, 9, 3, 2, 1, 0, 4, 8 };
set<int> st(vec.begin(), vec.end());
vec.assign(st.begin(), st.end());


vector<int>::iterator it;
for (it = vec.begin(); it != vec.end(); it++)
cout << *it<<endl;
return 0;

}

程式將輸出：

0
1
2
3
4
8
9