归并排序模板

#include <iostream>
using namespace std;
const int N=1e6+10;
int n,q[N],temp[N];
void merge_sort(int q[],int l,int r)
{
if(l>=r) return ;
int mid=l+r>>1;
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]) temp[k++]=q[i++];
else temp[k++]=q[j++];
while(i<=mid) temp[k++]=q[i++];
while(j<=r) temp[k++]=q[j++];
for(i=l,j=0;i<=r;i++,j++) q[i]=temp[j];
}
int main()
{
cin>>n;
for(int i=0;i<n;i++) cin>>q[i];
merge_sort(q,0,n-1);
for(int i=0;i<n;i++) cout<<q[i]<<" ";
return 0;
}