快排，快速排序算法，里面包含例子，并且有原始版本，有改进: 去除尾递归，有去除尾递归, 改进2):将较短的区间使用递归去排序. 较长的区间用循环去排序.-Fast discharge, fast sorting algorithm, which contains examples, and there is the original version, there are improvements: removal of tail recursion, there is removal of