AcWing 787. 归并排序
原题链接
简单
#include<iostream>
#include<cstdio>
using namespace std;
const int N=1e6+10;
int n;
int q[N],tmp[N]; //创建临时数组,暂存还未排好序的元素
void merge_sort(int q[],int l,int r)
{
if(l>=r) return;
//对数组两边的数据进行排序
int mid=(l+r)/2;
merge_sort(q,l,mid);
merge_sort(q,mid+1,r);
int k=0,i=l,j=mid+1;
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,j=0;i<=r;i++,j++) q[i]=tmp[j];
}
int main()
{
scanf("%d",&n);
for(int i=0;i<n;i++) scanf("%d",&q[i]);
merge_sort(q,0,n-1);
for(int i=0;i<n;i++) printf("%d ",q[i]);
cout << endl;
return 0;
}