复习归并排序
作者:
丶123
,
2021-07-10 12:01:43
,
所有人可见
,
阅读 221
#include<iostream>
using namespace std;
const int N =100010;
int q[N],tmp[N];
void merge_sort(int l,int r)
{
if(l>=r) return;
int mid = l+r >> 1;
merge_sort(l,mid);
merge_sort(mid+1,r);
//归并
int i=l,j=mid+1,k=0;
while(i<=mid && j<=r)
{
if(q[i]<=q[j]) tmp[k++] = q[i++];
else tmp[k++] = q[j++];
}
//扫尾
while(i<=mid) tmp[k++] = q[i++];
while(j<=r) tmp[k++] = q[j++];
//物归原主
for(int i=l,j=0;i<=r;i++,j++) q[i] = tmp[j];
}
int main()
{
int n;
scanf("%d",&n);
for(int i=0;i<n;i++) scanf("%d",q+i);
merge_sort(0,n-1);
for(int i=0;i<n;i++) cout << q[i] << " ";
return 0;
}