用递归实现归并排序（不会呀 不知道哪里错了）

#include<iostream>
using namespace std;
#include<vector>
#include "Vector.h"

void merge(int  num[], int tem[], int lo, int hi);
//归并排序
void mergesort(int num[],int tem[], int lo, int hi)
{
    //int *tem01;
    if (hi - lo == 0 )  tem[lo] = num[lo];

    else {
        int mid = (lo + hi) >> 1;
        mergesort(num, tem,lo, mid);
        mergesort(num, tem, mid+1, hi);
        merge(num, tem, lo, hi);//tem01是两个变量的中转站
    }
}
void merge(int  num[], int tem[], int lo, int hi) {
    int mid = (lo + hi) >> 1;
    int n = mid + 1;
    if ((lo <= mid) && (mid + 1 <= hi || num[lo] > tem[mid + 1])) {
        num[lo++] = tem[lo++];
    }
    if ((mid + 1 <= hi) && (lo <= mid || num[lo] < tem[mid + 1])) {
        num[lo++] = tem[(n)++];
    }
}
int main()
{
    int v1[10] = {1,2,3,0,9,8,7,6,5,4};
    int v2[10];
    mergesort(v1,v2, 0,9);
    for (int i = 0; i < 10; i++)
    {
        cout << v2[i]<< endl;
    }

    system("pause");
}