Submission #673854

#	Time	Username	Problem	Language	Result	Execution time	Memory
673854		Dan4Life	Circle selection (APIO18_circle_selection)	C++17	7 / 100	3095 ms	39628 KiB

circle_selection

#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define int long long 
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
using ll = long long;
const int maxn = (int)3e5+10;
const ll LINF = (ll)2e18;
struct circle{
	int x, y, r, i;
};

int n, elim[maxn];
vector<circle> v;

bool intersects(int i, int j){
	int rr = v[i].r+v[j].r;
	int xx = v[i].x-v[j].x;
	int yy = v[i].y-v[j].y;
	return rr*rr>=xx*xx+yy*yy;
}

int32_t main(){
	ios::sync_with_stdio(false); cin.tie(0);
	cin >> n; v.resize(n); set<pair<int,int>> S;
	for(int i = 0; i < n; i++){
		cin >> v[i].x >> v[i].y >> v[i].r;
		v[i].i=i; elim[i]=-1; S.insert({v[i].x, i});
	}
	sort(all(v), [&](circle a, circle b){
		if(a.r!=b.r) return a.r > b.r;
		return a.i < b.i;
	});
	for(int i = 0; i < n; i++){
		if(elim[v[i].i]!=-1) continue;
		for(int j = i; j < n; j++)
			if(intersects(i,j) and elim[v[j].i]==-1) elim[v[j].i]=v[i].i;
	}
	for(int i = 0; i < n; i++) cout << ++elim[i] << " ";
}

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