int main(void) {
    vector<int> v;
    v.push_back(3);
    v.push_back(3);
    v.push_back(3);
    v.push_back(1);
    v.push_back(5);

    sort(v.begin(),v.end());

    vector<int>::iterator it = unique(v.begin(), v.end());
    v.erase(it, v.end());
    int len = v.size();
    for (int i = 0; i < len; i++) {
        printf("%d\n", v[i]);
    }   // 1 3 5

    return 0;
}

int main(void) {
    vector<int> v;
    v.push_back(3);
    v.push_back(3);
    v.push_back(3);
    v.push_back(1);
    v.push_back(5);

    sort(v.begin(),v.end());

    vector<int> new_v;
    unique_copy(v.begin(), v.end(), back_inserter(new_v));
    int len = new_v.size();
    for (int i = 0; i < len; i++) {
        printf("%d\n", new_v[i]);
    }   // 1 3 5

    return 0;
}