c++用栈代替递归实现的快速排序，快速排序是一种比较节约时间的排序，一般用递归的方法实现，用栈虽然占用空间比递归大，但不要像递归一样把大多的时间浪费在递归的过程中，特别是对数字比较多的排序更有效-Recursive stack instead of using quick sort, quick sort is a kind of sorting to save time, usually with a recursive method to achieve, although the use of stack space than the recursive large, but not the same as the recursion time to waste most of recursive process , especially the sort of digital more effectively