编辑代码

#include <iostream>
using namespace std;

const int N = 1e6 + 10;
int fly[N],tmp[N];  // tmp数组作为临时存放数据的数组
int n; // 输入n个数

void merge_sort(int q[],int l,int r)
{
	if (l >= r)
	{
		return ;
	}
	int mid = (l + r) >> 1;
	int i = l,j = mid + 1,k = 0;  //k为tmp的下标
	merge_sort(q,l,mid);
	merge_sort(q,mid + 1,r);
	while (i <= mid && j <= r)
	{
		if (q[i] <= q[j])
		{
			tmp[k++] = q[i++];
		}
		else
		{
			tmp[k++] = q[j++];
		}
	}
	while (i <= mid)
	{
		tmp[k++] = q[i++];
	}
	while (j <= r)
	{
		tmp[k++] = q[j++];
	}
	for (i = l,k = 0;i <= r;i++,k++)  // 注意i必须从l开始，不能从0开始
	{
		q[i] = tmp[k];
	}
}
int main ()
{
	scanf ("%d",&n);
	for (int i = 0;i < n;i++)
	{
		scanf ("%d",&fly[i]);
	}
	merge_sort(fly,0,n - 1);
	for (int i = 0;i < n;i++)
	{
		printf ("%d ",fly[i]);
	}
	return  0;
}