实现二路归并排序算法。　　对上述排序算法，使用两个长度为一千万的线性表分别测试其性能，记录其运行时间（生成线性表的时间不计算在内）。第一个：线性表内的元素值随机生成；第二个：线性表的第i个元素值为i，即本来就有序。-Achieve Merging sorting algorithm. Above sorting algorithm, using two linear table with a length of ten million, respectively, to test its performance record of its running time (not including the time to generate a linear table). First: linear table element values ​ ​ randomly generated　second: the linear form of the i-th element value of i that was ordered.