AcWing 787. 归并排序
原题链接
简单
作者:
走不到也得走
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2020-01-11 20:45:00
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所有人可见
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阅读 666
#include<iostream>
using namespace std;
const int N=1e5+10;
int n;
int q[N];
int tmp[N];
void merge(int q[],int l,int r)
{
if(l>=r)return ;
int mid=l+r>>1;
merge(q,l,mid);
merge(q,mid+1,r);
int k=0;
int 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]);
//for(int i=0;i<n;i++)printf("%d",q[i]);
merge(q,0,n-1);
for(int i=0;i<n;i++)printf("%d ",q[i]);
return 0;
}