mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
77 lines
2.1 KiB
C++
77 lines
2.1 KiB
C++
#include<queue>
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#include<cstdio>
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#include<cstring>
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#include<algorithm>
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using namespace std;
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const int N=55555,K=5;
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const int inf=0x3f3f3f3f;
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#define sqr(x) (x)*(x)
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int k,n,idx;
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struct point
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{
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int x[K];
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bool operator < (const point &u) const
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{
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return x[idx]<u.x[idx];
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}
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}po[N];
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typedef pair<double,point>tp;
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priority_queue<tp>nq;
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struct kdTree
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{
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point pt[N<<2];
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int son[N<<2];
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void build(int l,int r,int rt=1,int dep=0)
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{
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if(l>r) return;
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son[rt]=r-l;
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son[rt*2]=son[rt*2+1]=-1;
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idx=dep%k;
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int mid=(l+r)/2;
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nth_element(po+l,po+mid,po+r+1);
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pt[rt]=po[mid];
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build(l,mid-1,rt*2,dep+1);
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build(mid+1,r,rt*2+1,dep+1);
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}
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void query(point p,int m,int rt=1,int dep=0)
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{
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if(son[rt]==-1) return;
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tp nd(0,pt[rt]);
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for(int i=0;i<k;i++) nd.first+=sqr(nd.second.x[i]-p.x[i]);
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int dim=dep%k,x=rt*2,y=rt*2+1,fg=0;
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if(p.x[dim]>=pt[rt].x[dim]) swap(x,y);
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if(~son[x]) query(p,m,x,dep+1);
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if(nq.size()<m) nq.push(nd),fg=1;
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else
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{
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if(nd.first<nq.top().first) nq.pop(),nq.push(nd);
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if(sqr(p.x[dim]-pt[rt].x[dim])<nq.top().first) fg=1;
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}
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if(~son[y]&&fg) query(p,m,y,dep+1);
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}
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}kd;
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void print(point &p)
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{
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for(int j=0;j<k;j++) printf("%d%c",p.x[j],j==k-1?'\n':' ');
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}
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int main()
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{
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while(scanf("%d%d",&n,&k)!=EOF)
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{
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for(int i=0;i<n;i++) for(int j=0;j<k;j++) scanf("%d",&po[i].x[j]);
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kd.build(0,n-1);
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int t,m;
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for(scanf("%d",&t);t--;)
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{
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point ask;
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for(int j=0;j<k;j++) scanf("%d",&ask.x[j]);
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scanf("%d",&m); kd.query(ask,m);
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printf("the closest %d points are:\n", m);
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point pt[20];
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for(int j=0;!nq.empty();j++) pt[j]=nq.top().second,nq.pop();
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for(int j=m-1;j>=0;j--) print(pt[j]);
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}
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}
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return 0;
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}
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