求解多项式方程的零点，输入为先输入n，多项式的次数。然后输入从高到低项的系数，接着输入范围[l,r]。输出[l,r]范围内，零点-Polynomial equation zero, enter the first input n, the degree of the polynomial. Then enter high to low coefficient, and then enter the range [l, r]. Output [l, r] range, the zero