remove duplicates from vector c++

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

int main() {
    std::vector<int> vec = {1, 2, 3, 2, 4, 5, 3, 6, 7, 8, 7, 9};

    std::sort(vec.begin(), vec.end());

    auto last = std::unique(vec.begin(), vec.end());

    vec.erase(last, vec.end());

    for (const auto &element : vec) {
        std::cout << element << " ";
    }

    return 0;
}