Submission #203724

#	Time	Username	Problem	Language	Result	Execution time	Memory
203724		Segtree	Circle selection (APIO18_circle_selection)	C++14	7 / 100	85 ms	1528 KiB

circle_selection

#include<iostream>
#include<algorithm>
#include<vector>
#include<set>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> P;
#define rep(i,n) for(int i=0;i<n;i++)
#define chmin(a,b) a=min(a,b)
#define chmax(a,b) a=max(a,b)
#define N 5010
ll n,x[N],y[N],r[N];
struct en{
	ll rad,id;
	bool operator<(const en&key)const{
		if(this->rad==key.rad)return this->id<key.id;
		return this->rad>key.rad;
	}
};
ll par[N];
int main(){
	cin>>n;
	vector<en> v;
	rep(i,n){
		cin>>x[i]>>y[i]>>r[i];
		v.push_back((struct en){r[i],i});
	}
	sort(v.begin(),v.end());
	rep(i,n)par[i]=-1;
	for(auto e:v){
		if(par[e.id]>=0)continue;
		rep(i,n)if(par[i]==-1){
			ll dx=x[i]-x[e.id]; dx*=dx;
			ll dy=y[i]-y[e.id]; dy*=dy;
			ll dr=r[i]+r[e.id]; dr*=dr;
			if(dx+dy<=dr)par[i]=e.id;
		}
	}
	rep(i,n)cout<<par[i]+1<<endl;
}

• Subtask 1: 7 / 7
• Subtask 2: 0 / 12
• Subtask 3: 0 / 15
• Subtask 4: 0 / 23
• Subtask 5: 0 / 30
• Subtask 6: 0 / 13