Dev - C++ - Alguien me puede ayudar a traducir un codigo de c# a c++?

using System;

using System.Text;

namespace MulitplyPolinomy

{

    class Program

    {

        static void Main(string[] args)

        {

            // (x^2 + 2x -3)

            var a = new double[] { -3, 2, 1 };

            // (x+2)

            var b = new double[] { 2, 1 };

            var m = Multiply(a, b);

            Console.WriteLine(PolinomyToString(m));

        }

        static double[] Multiply(double[] a, double[] b)

        {

            var result = new double[a.Length + b.Length - 1];

            for (int i = 0; i < a.Length; i++)

            {

                for (int j = 0; j < b.Length; j++)

                {

                    result[i + j] += a[i] * b[j];

                }

            }

            return result;

        }

        static string PolinomyToString(double[] p)

        {

            var sb = new StringBuilder();

            for (int i = 0; i < p.Length; i++)

            {

                if (i > 0) sb.Append(" + ");

                sb.Append(p[i].ToString());

                if (i > 0) sb.Append("x^").Append(i.ToString());

            }

            return sb.ToString();

        }

    }

}

//Necesito traducir este codigo de C# a C++

#include <iostream>

#include <vector>

std::vector<double> multiply(const std::vector<double> & a, const std::vector<double> & b)

{

    auto result = std::vector<double>((a.size() + b.size()) -1);

    for (int i = 0; i < a.size(); i++)

    {

        for (int j = 0; j < b.size(); j++)

        {

                result[i + j] += a[i] * b[j];

        }

    }

    return result;

}

std::string PolinomyToString(const std::vector<double> & p) {

    std::string sb;

    for (int i = 0; i < p.size(); i++)

    {

        if (i > 0) sb.append(" + ");

        sb.append(std::to_string(p.at(i)));

        if (i > 0) sb.append("x^").append(std::to_string(i));

    }

    return sb;

}

int main(int argc, char const *argv[])

{

    // (x^2 + 2x -3)

    std::vector<double> a {-3,2,1};

    // (x+2)

    std::vector<double> b {2,1};

    auto m = multiply(a,b);

    std::cout << PolinomyToString(m) << std::endl;

    return 0;

}