一个日本公司的笔试题，实现一个栈，返回栈中的最大值最小值中间值，实现是算法导论里的算法重现-A Japanese company' s pen questions, to implement a stack, return stack in the middle of the maximum value of the minimum to achieve the algorithm is the algorithm to reproduce in the Introduction

算法导论习题中结合插入排序，对快速排序进行优化的实现-Introduction to Algorithms exercises incorporate insertion sort, quick sort optimized for implementation