插值算法是一类重要的线性搜索方法，其基本思想是在搜索区间中不断用低次插值多项式来近似目标函数。该程序是用二次插值算法求区间上的无约束最优化解。-Interpolation algorithm is one important class of linear search method, its basic idea is constantly in the search interval with a low polynomial interpolation to approximate the