输出具有重复值的向量

#include <iostream>
#include <vector>
#include <unordered_set>

std::vector<int> findDuplicates(std::vector<int>& nums) {
    std::vector<int> result;
    std::unordered_set<int> uniqueNums;

    for (int num : nums) {
        if (uniqueNums.count(num) > 0) {
            result.push_back(num);
        } else {
            uniqueNums.insert(num);
        }
    }

    return result;
}

int main() {
    std::vector<int> nums = {1, 2, 3, 4, 2, 5, 6, 3};
    std::vector<int> duplicates = findDuplicates(nums);

    if (duplicates.empty()) {
        std::cout << "No duplicates found." << std::endl;
    } else {
        std::cout << "Duplicates found: ";
        for (int num : duplicates) {
            std::cout << num << " ";
        }
        std::cout << std::endl;
    }

    return 0;
}