Submission #1216837

#	Time	Username	Problem	Language	Result	Execution time	Memory
1216837		MateiKing80	Roads (CEOI20_roads)	C++20	15 / 100	23 ms	1096 KiB

roads

#include <bits/extc++.h>

using namespace std;

using pii = pair<int, int>;
#define fr first
#define sc second

pii pts[200000];
int dx, dy;

bool cmp(pii a, pii b) {
	int va = a.fr * dy - a.sc * dx;
	int vb = b.fr * dy - b.sc * dx;
	if (va != vb) 
		return va < vb;
	return a < b;
}

signed main() {  
	int n;
	cin >> n;
	for (int i = 0; i < 2 * n; i ++)
		cin >> pts[i].fr >> pts[i].sc;
	dx = pts[0].fr - pts[1].fr;
	dy = pts[0].sc - pts[1].sc;
	sort(pts, pts + 2 * n, cmp);
	for (int i = 0; i < n - 1; i ++)
		cout << pts[2 * i + 1].fr << " " << pts[2 * i + 1].sc << " " << pts[2 * i + 2].fr << " " << pts[2 * i + 2].sc << '\n';
}

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