最大间隙问题，给定n个实数x1,...xn，求这n个数在是轴上响铃2个数之间的最大差值，是和曾哥函数耗时O(1)。采用桶和抽屉原理求解-Maximum gap problem, given n real numbers x1, ... xn, find that the number n is the axis of the rings the maximum difference between the two numbers is a time-consuming and had broth