Dev - C++ - Almacenar notas de estudiantes en una mariz y calcular la nota definitiva

#include <iostream>

using namespace std;

int main()

{

    float alumnos[10][4] = {0};

    for (int i = 0; i < 10; i++)

    {

        cout << "\nAlumno " << i + 1 << ":\n";

        for (int j = 0; j < 3; j++)

        {

            cout << "Nota " << j + 1 << ": ";

            cin >> alumnos[i][j];

            if (j == 0 || j == 1)

                alumnos[i][3] += alumnos[i][j] * 0.35f;

            else

                alumnos[i][3] += alumnos[i][j] * 0.30f;

        }

    }

    for (int i = 0; i < 10; i++)

    {

        cout << "\nAlumno " << i + 1 << ":\n";

        cout << "Notas: ";

        for (int j = 0; j < 3; j++)

        {

            cout << alumnos[i][j] << " ";

        }

        cout << "nota final: " << alumnos[i][3] << endl;;

    }

    cout << endl;

    return 0;

}