请编写算法，求一元多项式Pn(x) = 的值Pn(x0)。本题的输入为ai(i = 0,1,…,n)，x0和n，输出为Pn(x0) -Please write the algorithm, find a polynomial Pn (x) = the value of (Pn) (x0). The input of this title for the ai (i = 0,1, ..., n), x0, and n, the output of Pn (x0)