제출 #83563

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
83563		faceless	The Forest of Fangorn (CEOI14_fangorn)	C++14	0 / 100	286 ms	16892 KiB

fangorn

#include <bits/stdc++.h>
#define MP make_pair
#define F first
#define PB push_back
#define S second
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
const int mod = (int)1e9 + 7;
const int maxn = 1e4 + 4;
const ll inf = 1e18;

pii p[maxn];
vector <int> v[maxn];

pii operator + (pii fi, pii se) {
	return {fi.F + se.F, fi.S + se.S};
}

pii operator - (pii fi, pii se) {
	return {fi.F - se.F, fi.S - se.S};
}

int cross(pii A, pii B, pii C){
	pii AB = B - A;
	pii AC = C - A;
	int cross = AB.F * AC.S - AB.S * AC.F;
	return cross;
}

int rob (pii x) {
	if (x.F >= 0 and x.S > 0)
		return 4;
	if (x.F > 0 and x.S <= 0)
		return 3;
	if (x.F <= 0 and x.S < 0)
		return 2;
	return 1;
}

bool cmp (int fi, int se) {
	int x = rob (p[fi]), y = rob (p[se]);
	if (x == y)
		return !cross ({0, 0}, p[fi], p[se]);
	return x > y;
}


bool isright (pii a, pii b, pii c) {
	if (cross (a, b, c) > 0)
		return 1;
	return 0;
}

int n;
int district (int src, pii x) {
	int lo = 0, hi = n;
	while (hi - lo > 1) {
		int mid = (hi + lo) >> 1;
		pii AB = p[src] - p[v[src][0]];
		pii AC = p[src] - p[v[src][mid]];
//		cout << mid << " -> " << AB.F << " " << AB.S << " - " << AC.F << " " << AC.S << endl;
		if (isright (p[src], p[src] + AB, p[src] + AC)) {
			if (isright (p[src], p[src] + AB, x) and !isright (p[src], p[src] + AC, x)) {
				hi = mid;
			}
			else {
				lo = mid;
			}
		}
		else {
			if (isright (p[src], p[src] + AB, x) or !isright (p[src], p[src] + AC, x)) {
				hi = mid;
			}
			else {
				lo = mid;
			}
		}
	}
	return hi;

}

bool isinsame (int src, pii fi, pii se) {
//	cout << district (src, fi) << endl << district (src, se) << endl;
	if (district (src, fi) == district (src, se))
		return 1;
	return 0;
}

pii c[maxn];
int main (){
	ios_base::sync_with_stdio(false);
	int w, h;
	cin >> w >> h;
	pii s;
	cin >> s.F >> s.S;
	int number_of_camps;
	cin >> number_of_camps;
	for (int i = 0; i < number_of_camps; i++)
		cin >> c[i].F >> c[i].S;
	cin >> n;
	for (int i = 0; i < n; i++)
		cin >> p[i].F >> p[i].S;

	for (int i = 0; i < n; i++) {
		for (int j = 0; j < n; j++) {
			if (i == j)
				continue;
			v[i].PB (j);
			p[j].F = p[i].F - p[j].F;
			p[j].S = p[i].S - p[j].S;
		}
		sort (v[i].begin(), v[i].end(), cmp);
		for (int j = 0; j < n; j++) {
			if (j == i)
				continue;
			p[j].F -= p[i].F;
			p[j].F *= -1;
			p[j].S -= p[i].S;
			p[j].S *= -1;
		}
	}

//	for (auto it : v[3])
//		cout << it << " ";
//	cout << endl;
//	isinsame (3, c[0], s);
//	return 0;
	vector <int> ans;
	for (int i = 0; i < number_of_camps; i++) {
		bool found = 0;
		for (int j = 0; j < n; j++) {
//			cout << i << " " << j << " -> " << isinsame (j, c[i], s) << endl;
			if (!isinsame (j, c[i], s)) {
				found = 1;
				break;
			}
		}
		if (!found)
			ans.PB (i + 1);
	}
	cout << ans.size() << endl;
	for (auto it : ans)
		cout << it << " ";
	cout << endl;
}

• Subtask 1: 0 / 30
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 20