利用归并排序算法，实现逆序数的计数，sort and count，用Java实现-Use merge sort algorithm, count the number in reverse order, sort and count, implemented in Java

排序算法，java语言编写，有直接插入排序，希尔排序，冒泡排序，快速排序，归并排序，堆排序。(Sorting algorithm, written in Java language, has direct insertion sort, Hill sort, bubble sort, quick sort, merge sort, heap sort.)