快速排序算法及其优化，在序列长于某个给定值时递归采用快速排序，小于这个值时用插入排序代替快排，以优化快速排序的性能，同时程序记录优化前后的程序耗时给出比较。-Quick sort algorithm and optimization, in sequence longer than a given value recursively using quick sort, is less than this value quickly replaced by rows of insertion sort, quick sort in order to optimize performance while optimizing the program recorded before and after the time-consuming process given comparison.