Submission #963098

#	Time	Username	Problem	Language	Result	Execution time	Memory
963098		anton	Roads (CEOI20_roads)	C++17	30 / 100	268 ms	15440 KiB

roads

#include<bits/stdc++.h>

using namespace std;
#define int long long

struct Point{
    int x, y;
    int name;

};
Point rot90(Point a){
    Point res;
    res.y= -a.x;
    res.x =a.y;
    return res;
}
Point dif(Point& a, Point& b){
    Point res;
    res.x= b.x-a.x;
    res.y = b.y-a.y;
    return res;
}
int dot(Point& a, Point& b){
    return a.x*b.x+ a.y*b.y;
}

void transform(Point& p, pair<Point, Point> base){
    int x= dot(p, base.first);
    int y= dot(p, base.second);
    p.x =x;
    p.y = y;
}
const int MAX_N = 1e5;
pair<Point, Point> pts[MAX_N];
Point initial[2*MAX_N];
signed main(){
    int n;
    cin>>n;
    for(int i = 0; i<n; i++){
        Point a, b;
        a.name = i*2;
        b.name = i*2+1;
        cin>>a.x>>a.y>>b.x>>b.y;
        initial[i*2] =a;
        initial[i*2+1] = b;
        pts[i].first= a;
        pts[i].second= b;
        
    }
    pair<Point, Point> base =  { rot90(dif(pts[0].first, pts[0].second)), dif(pts[0].first, pts[0].second)};

    for(int i= 0; i<n; i++){
        transform(pts[i].first, base);
        transform(pts[i].second, base);
        //cout<<pts[i].first.x<<" "<<pts[i].first.y<<" "<<pts[i].second.x<<" "<<pts[i].second.y<<endl;
        if(pts[i].first.y>pts[i].second.y){
            swap(pts[i].first, pts[i].second);
        }
    }
    auto cmp =[&](pair<Point, Point>& a, pair<Point, Point>& b){
        if(a.first.x!=b.first.x){
            return a.first.x<b.first.x;
        }
        else{
            return a.first.y< b.first.y;
        }
    };
    sort(&pts[0], &pts[n], cmp);

    for(int i = 0; i<n-1; i++){
        Point a= initial[pts[i].second.name];       
        Point b= initial[pts[i+1].first.name];

        cout<<a.x<<" "<<a.y<<" "<<b.x<<" "<<b.y<<endl;
    }
}

• Subtask 1: 0 / 0
• Subtask 2: 15 / 15
• Subtask 3: 15 / 15
• Subtask 4: 0 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 40