Submission #389999

#	Time	Username	Problem	Language	Result	Execution time	Memory
389999		talant117408	Roads (CEOI20_roads)	C++17	15 / 100	38 ms	2252 KiB

roads

/*
    Code written by Talant I.D.
*/
#include <bits/stdc++.h>
 
using namespace std;

typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
 
#define precision(n) fixed << setprecision(n)
#define pb push_back
#define ub upper_bound
#define lb lower_bound
#define mp make_pair
#define eps (double)1e-9
#define PI 2*acos(0.0)
#define endl "\n"
#define sz(v) int((v).size())
#define all(v) v.begin(),v.end()
#define rall(v) v.rbegin(),v.rend()
#define do_not_disturb ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define OK cout << "OK" << endl;
 
const int mod = 1e9+7;
 
ll mode(ll a) {
    a %= mod;
    if (a < 0) a += mod;
    return a;
}
 
ll subt(ll a, ll b) {
    return mode(mode(a)-mode(b));
}
 
ll add(ll a, ll b) {
    return mode(mode(a)+mode(b));
}
 
ll mult(ll a, ll b) {
    return mode(mode(a)*mode(b));
}
 
ll binpow(ll a, ll b) {
    ll res = 1;
    while (b) {
        if (b&1) res = mult(res, a);
        a = mult(a, a);
        b >>= 1;
    }
    return res;
}

struct Point {
	double x, y;
	bool operator < (const Point &other) {
		if (x == other.x) return y < other.y;
		return x < other.x;
	}
};

const int N = 1e5+7;
pair <Point, Point> segments[N];
int n;

double slope(pair <Point, Point> a) {
	if (a.first.x == a.second.x) return 1e9;
	else return (a.second.y-a.first.y)/(a.second.x-a.first.x);
}

bool subtask1() {
	bool flag = 1;
	for (int i = 0; i < n; i++) {
		if (fabs(segments[i].first.x-segments[i].second.x) > eps) flag = 0;
	}
	return flag;
}

bool subtask2() {
	bool flag = 1;
	for (int i = 1; i < n; i++) {
		auto a = segments[i-1];
		auto b = segments[i];
		if (fabs(slope(a)-slope(b)) > eps) flag = 0;
	}
	return flag;
}

int main() {
	do_not_disturb
	
	cin >> n;
	
	for (int i = 0; i < n; i++) {
		cin >> segments[i].first.x >> segments[i].first.y >> segments[i].second.x >> segments[i].second.y;
		if (segments[i].second.x == segments[i].first.x && segments[i].second.y < segments[i].first.y) swap(segments[i].first, segments[i].second);
		else if (segments[i].second.x < segments[i].first.x) swap(segments[i].first, segments[i].second);
	}
	
	if (subtask1()) {
		vector <Point> allp;
		for (int i = 0; i < n; i++) {
			allp.pb(segments[i].first);
			allp.pb(segments[i].second);
		}
		sort(all(allp));
		for (int i = 3; i < n*2; i += 2) {
			if (allp[i].x == allp[i-2].x) {
				cout << (ll)allp[i-1].x << ' ' << (ll)allp[i-1].y << ' ' << (ll)allp[i-2].x << ' ' << (ll)allp[i-2].y << endl;
			}
			else {
				cout << (ll)allp[i].x << ' ' << (ll)allp[i].y << ' ' << (ll)allp[i-2].x << ' ' << (ll)allp[i-2].y << endl;
			}
		}
	}
	else if (subtask2()) {
		auto cmp = [&](pair <Point, Point> a, pair <Point, Point> b) {
			if (fabs((a.first.y-a.first.x*slope(a))-(b.first.y-b.first.x*slope(b))) < eps) {
				return a.second.x < b.second.x;
			}
			return a.first.y-a.first.x*slope(a) < b.first.y-b.first.x*slope(b);
		};
		sort(segments, segments+n, cmp);
		for (int i = 1; i < n; i++) {
			auto a = segments[i-1];
			auto b = segments[i];
			if (fabs((a.first.x-a.first.y)-(b.first.x-b.first.y)) < eps) {
				cout << (ll)a.second.x << ' ' << (ll)a.second.y << ' ' << (ll)b.first.x << ' ' << (ll)b.first.y << endl;
			}
			else {
				cout << (ll)a.first.x << ' ' << (ll)a.first.y << ' ' << (ll)b.first.x << ' ' << (ll)b.first.y << endl;
			}
		}
	}
	
    return 0;
}

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