Submission #226255

#	Time	Username	Problem	Language	Result	Execution time	Memory
226255		dolphingarlic	Dragon 2 (JOI17_dragon2)	C++14	100 / 100	2582 ms	2296 KiB

dragon2

#include <bits/stdc++.h>
#define FOR(i, x, y) for (int i = x; i < y; i++)
typedef long long ll;
using namespace std;

struct Point {
	ll x, y;
} A, B;

inline bool ccw(Point X, Point Y, Point Z) {
	return (X.x - Y.x) * (Z.y - Y.y) <= (X.y - Y.y) * (Z.x - Y.x);
}

vector<Point> by_tribe[30000];

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int n, m;
	cin >> n >> m;
	FOR(i, 0, n) {
		Point p;
		int tribe;
		cin >> p.x >> p.y >> tribe;
		by_tribe[tribe - 1].push_back(p);
	}
	cin >> A.x >> A.y >> B.x >> B.y;

	int q;
	cin >> q;
	while (q--) {
		int x, y;
		cin >> x >> y;
		int ans = 0;
		for (Point i : by_tribe[x - 1]) for (Point j : by_tribe[y - 1]) {
			if (ccw(i, A, B)) ans += (ccw(i, A, j) && ccw(j, B, i));
			else ans += (ccw(j, A, i) && ccw(i, B, j));
		}
		cout << ans << '\n';
	}
	return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 45 / 45
• Subtask 3: 40 / 40