Submission #240003

#	Time	Username	Problem	Language	Result	Execution time	Memory
240003		alishahali1382	Circle selection (APIO18_circle_selection)	C++14	23 / 100	2684 ms	48888 KiB

circle_selection

#include <bits/stdc++.h>
#pragma GCC optimize ("O2,unroll-loops")
//#pragma GCC optimize("no-stack-protector,fast-math")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<pii, int> piii;
typedef pair<ll, ll> pll;
#define debug(x) cerr<<#x<<'='<<(x)<<endl;
#define debugp(x) cerr<<#x<<"= {"<<(x.first)<<", "<<(x.second)<<"}"<<endl;
#define debug2(x, y) cerr<<"{"<<#x<<", "<<#y<<"} = {"<<(x)<<", "<<(y)<<"}"<<endl;
#define debugv(v) {cerr<<#v<<" : ";for (auto x:v) cerr<<x<<' ';cerr<<endl;}
#define all(x) x.begin(), x.end()
#define pb push_back
#define kill(x) return cout<<x<<'\n', 0;

const ld eps=1e-7;
const int inf=1000000010;
const ll INF=10000000000000010LL;
const int mod=1000000007;
const int MAXN=300010, LOG=20;

int n, m, k, u, v, x, y, t, a, b;
int X[MAXN], Y[MAXN], R[MAXN], P[MAXN], L=inf;
int ans[MAXN];
map<pii, vector<int>> mp;

bool check(int i, int j){
	ll dx=X[i]-X[j], dy=Y[i]-Y[j], r=R[i]+R[j];
	return dx*dx+dy*dy<=r*r;
}

void Build(){
	mp.clear();
	for (int i=1; i<=n; i++) if (!ans[i]) mp[{X[i]/L, Y[i]/L}].pb(i);
}

int main(){
	ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
	//freopen("input.txt", "r", stdin);
	//freopen("output.txt", "w", stdout);
	cin>>n;
	for (int i=1; i<=n; i++) cin>>X[i]>>Y[i]>>R[i], P[i]=i;
	sort(P+1, P+n+1, [](int i, int j){
		return pii(R[i], -i)>pii(R[j], -j);	
	});
	L=R[P[1]];
	Build();
	for (int i=1; i<=n; i++){
		int id=P[i];
		if (ans[id]) continue ;
		//if (R[id]<.75*L) L=R[id], Build();
		int x=X[i]/L, y=Y[i]/L;
		for (int xx=x-2; xx<=x+2; xx++)
			for (int yy=y-2; yy<=y+2; yy++) if (mp.count({xx, yy})){
				vector<int> vec=mp[{xx, yy}], v2;
				for (int i:vec){
					if (check(id, i)) ans[i]=id;
					else v2.pb(i);
				}
				mp[{xx, yy}]=v2;
			}
		
	}
	for (int i=1; i<=n; i++) cout<<ans[i]<<' ';
	
	return 0;
}
/*
11
9 9 2
13 2 1
11 8 2
3 3 2
3 12 1
12 14 1
9 8 5
2 8 2
5 2 1
14 4 2
14 14 1

*/

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