Submission #1073860

#	Time	Username	Problem	Language	Result	Execution time	Memory
1073860		ngrace	Circle selection (APIO18_circle_selection)	C++14	19 / 100	889 ms	64216 KiB

circle_selection

#include <bits/stdc++.h>
using namespace std;
#define v vector
#define ll long long
#define ii pair<ll,ll>
#define fi first
#define se second

struct Circle{
    ll x, y, r, i;
};

int N;
v<Circle> C;

bool compC(Circle& a, Circle& b){
    if(a.r==b.r) return a.i<b.i;
    return a.r>b.r;
}
bool isect(Circle& a, Circle& b){
    ll dx=a.x-b.x;
    ll dy=a.y-b.y;
    ll r=a.r+b.r;
    return dx*dx+dy*dy <= r*r;
}

v<ll> eBy;

void sub1(){
    for(int i=0; i<N; i++){
        if(eBy[C[i].i]!=-1) continue;
        eBy[C[i].i] = C[i].i;
        for(int j=i+1; j<N; j++){
            if(eBy[C[j].i]==-1 && isect(C[i], C[j])){
                eBy[C[j].i] = C[i].i;
            }
        }
    }
}

void sub2(){
    set<ii> pts;
    for(int i=0; i<N; i++){
        pts.insert(make_pair(C[i].x-C[i].r, i));
        pts.insert(make_pair(C[i].x+C[i].r, i));
    }

    for(int i=0; i<N; i++){
        if(eBy[C[i].i]!=-1) continue;
        v<int> del;
        auto it = pts.lower_bound(make_pair(C[i].x-C[i].r, -1));
        while(it!=pts.end() && (*it).fi<=C[i].x+C[i].r){
            del.push_back((*it).se);
            it++;
        }
        for(int ind:del){
            eBy[C[ind].i] = C[i].i;
            pts.erase(make_pair(C[ind].x-C[ind].r, ind));
            pts.erase(make_pair(C[ind].x+C[ind].r, ind));
        }
    }
}

void sub3(){

}

void sub4(){

}

void full(){

}

int main(){
    cin>>N;
    bool s2 = true;
    bool s4 = true;
    for(int i=0; i<N; i++){
        ll x,y,r;
        cin>>x>>y>>r;
        C.push_back({x,y,r,i});
        s2 = s2 && y==0;
        s4 = s4 && r==C[0].r;
    }
    sort(C.begin(), C.end(), compC);

    eBy = v<ll>(N,-1);

    if(N<=5000) sub1();
    else if(s2) sub2();
    else if(s4) sub4();
    else sub3();

    for(int i:eBy) cout<<i+1<<" ";
    cout<<endl;
}

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