C＋＋实现的牛顿插值算法：对于n个点的插值，产生多项式的时间复杂度是O(n*n)，最终进行一个点的计算的时间复杂度是O(n)。-C++ realization of the Newton interpolation algorithm: For n of interpolation points, resulting in polynomial time complexity is O (n* n), the final calculation of a point of time comple