排序算法---归并排序

import java.util.*;
// 1:无需package
// 2: 类名必须Main, 不可修改

public class Main {
    static int[] mergeArr;
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        int[] arr = new int[n];
        mergeArr = new int[n];
        for(int i =0;i