Submission #742300

#	Time	Username	Problem	Language	Result	Execution time	Memory
742300		victor_gao	Circle selection (APIO18_circle_selection)	C++17	7 / 100	3069 ms	23892 KiB

circle_selection

//#pragma GCC optimize("Ofast,unroll-loops,O3")
//#pragma GCC optimize("avx,avx2,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,fma,tune=native")
#include<bits/stdc++.h>
//#include<bits/extc++.h>
//#pragma pack(1)
#define fast ios::sync_with_stdio(0); cin.tie(0);
#define int long long
#define pii pair<int,int>
#define x first
#define y second
#define N 300015
using namespace std;
//using namespace __gnu_pbds;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
//typedef tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update> order_multiset;
//typedef tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> order_set;
struct circle{
    int x,y,r,i;
    circle(int a=0,int b=0,int c=0,int d=0):x(a),y(b),r(c),i(d){}
    bool operator<(const circle a)const{
        if (r!=a.r) return r<a.r;
        else return i>a.i;
    }
    bool intersect(circle c){
        int dis=(c.x-x)*(c.x-x)+(c.y-y)*(c.y-y);
        return dis<=(r+c.r)*(r+c.r);
    }
};
int n,ans[N];
vector<circle>all;
set<int>st;
signed main(){
    fast
    cin>>n;
    for (int i=1;i<=n;i++){
        int a,b,c; cin>>a>>b>>c;
        all.push_back(circle(a,b,c,i));
    }
    sort(all.begin(),all.end());
    while (!all.empty()){
        circle now=all.back(); all.pop_back();
        if (ans[now.i]) continue;
        ans[now.i]=now.i;
        for (auto i:all){
            if (ans[i.i]) continue;
            if (now.intersect(i)){
                ans[i.i]=now.i;
                continue;
            }
        }
    }
    for (int i=1;i<=n;i++)
        cout<<ans[i]<<" ";
    cout<<'\n';
}

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