how hard is c++ dynamic programnming code example

Example: dynamic programming with code implementation in c++

int fibonacci(int n)
{
    if(n == 0)
    {
        return 0;
    }
    if(n == 1)
    {
        return 1;
    }
    else
    {
        return fibonacci(n - 1) + fibonacci(n - 2);
    }
}