如何从重复元素的列表中删除元素？

const list = [1, 2, 3, 3, 4, 4, 5];
const uniqueList = [...new Set(list)];

list = [1, 2, 3, 3, 4, 4, 5]
dict = {}
uniqueList = [dict.setdefault(x, x) for x in list if x not in dict]

#include <iostream>
#include <vector>

int main() {
    std::vector<int> list = {1, 2, 3, 3, 4, 4, 5};
    std::vector<int> uniqueList;

    for (int i = 0; i < list.size(); i++) {
        bool isDuplicate = false;
        for (int j = 0; j < i; j++) {
            if (list[i] == list[j]) {
                isDuplicate = true;
                break;
            }
        }
        if (!isDuplicate) {
            uniqueList.push_back(list[i]);
        }
    }

    for (int i = 0; i < uniqueList.size(); i++) {
        std::cout << uniqueList[i] << " ";
    }

    return 0;
}