如何将嵌套向量转换为行的集合，而不是列的集合，如vector<vector<int>> to set<vector<int>>

#include <iostream>
#include <vector>
#include <set>

std::set<std::vector<int>> convertToRowSet(const std::vector<std::vector<int>>& nestedVector) {
    std::set<std::vector<int>> rowSet;
    
    for (const auto& vector : nestedVector) {
        rowSet.insert(vector);
    }
    
    return rowSet;
}

int main() {
    std::vector<std::vector<int>> nestedVector = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
    
    std::set<std::vector<int>> rowSet = convertToRowSet(nestedVector);
    
    for (const auto& row : rowSet) {
        for (const auto& element : row) {
            std::cout << element << " ";
        }
        std::cout << std::endl;
    }
    
    return 0;
}

1 2 3 
4 5 6 
7 8 9