Submission #1239342

#	Time	Username	Problem	Language	Result	Execution time	Memory
1239342		kaiboy	Park (BOI16_park)	C++20	100 / 100	85 ms	16456 KiB

park

#include <algorithm>
#include <iostream>
#include <cmath>

using namespace std;

const int   N = 2000;
const int INF = 0x7fffffff;

int xx[N + 1], yy[N + 1], rr[N + 1];
int ww[N + 2][N + 2], dd[N + 2];

int dijkstra(int n) {
	for (int i = 0; i < n; i++)
		dd[i] = INF;
	dd[0] = 0;
	for (int h = 0; h < n; h++) {
		int i = -1;
		for (int j = 0; j < n; j++)
			if (dd[j] != -1 && (i == -1 || dd[i] > dd[j]))
				i = j;
		int d = dd[i]; dd[i] = -1;
		if (i == n - 1)
			return d;
		for (int j = 0; j < n; j++)
			dd[j] = min(dd[j], max(d, ww[i][j]));
	}
	return -1;
}

int main() {
	ios_base::sync_with_stdio(false), cin.tie(NULL);
	int n, q; cin >> n >> q;
	int x_, y_; cin >> x_ >> y_;
	for (int i = 1; i <= n; i++)
		cin >> xx[i] >> yy[i] >> rr[i];
	ww[0][n + 1] = min(x_, y_);
	for (int i = 1; i <= n; i++)
		for (int j = i + 1; j <= n; j++)
			ww[i][j] = ww[j][i] = (int) hypot(xx[j] - xx[i], yy[j] - yy[i]) - rr[i] - rr[j];
	for (int i = 1; i <= n; i++) {
		ww[0][i] = ww[i][0] = yy[i] - rr[i];
		ww[i][n + 1] = ww[n + 1][i] = min(min(xx[i], x_ - xx[i]), y_ - yy[i]) - rr[i];
	}
	int d12 = dijkstra(n + 2);
	for (int i = 1; i <= n; i++) {
		ww[0][i] = ww[i][0] = min(yy[i], x_ - xx[i]) - rr[i];
		ww[i][n + 1] = ww[n + 1][i] = min(xx[i], y_ - yy[i]) - rr[i];
	}
	int d13 = dijkstra(n + 2);
	for (int i = 1; i <= n; i++) {
		ww[0][i] = ww[i][0] = xx[i] - rr[i];
		ww[i][n + 1] = ww[n + 1][i] = min(min(yy[i], y_ - yy[i]), x_ - xx[i]) - rr[i];
	}
	int d14 = dijkstra(n + 2);
	for (int i = 1; i <= n; i++) {
		ww[0][i] = ww[i][0] = x_ - xx[i] - rr[i];
		ww[i][n + 1] = ww[n + 1][i] = min(min(yy[i], y_ - yy[i]), xx[i]) - rr[i];
	}
	int d23 = dijkstra(n + 2);
	for (int i = 1; i <= n; i++) {
		ww[0][i] = ww[i][0] = min(xx[i], yy[i]) - rr[i];
		ww[i][n + 1] = ww[n + 1][i] = min(x_ - xx[i], y_ - yy[i]) - rr[i];
	}
	int d24 = dijkstra(n + 2);
	for (int i = 1; i <= n; i++) {
		ww[0][i] = ww[i][0] = y_ - yy[i] - rr[i];
		ww[i][n + 1] = ww[n + 1][i] = min(min(xx[i], x_ - xx[i]), yy[i]) - rr[i];
	}
	int d34 = dijkstra(n + 2);
	while (q--) {
		int d, a; cin >> d >> a, d *= 2;
		if (a == 1) {
			cout << 1;
			if (d12 >= d)
				cout << 2;
			if (d13 >= d)
				cout << 3;
			if (d14 >= d)
				cout << 4;
		} else if (a == 2) {
			if (d12 >= d)
				cout << 1;
			cout << 2;
			if (d23 >= d)
				cout << 3;
			if (d24 >= d)
				cout << 4;
		} else if (a == 3) {
			if (d13 >= d)
				cout << 1;
			if (d23 >= d)
				cout << 2;
			cout << 3;
			if (d34 >= d)
				cout << 4;
		} else {
			if (d14 >= d)
				cout << 1;
			if (d24 >= d)
				cout << 2;
			if (d34 >= d)
				cout << 3;
			cout << 4;
		}
		cout << '\n';
	}
	return 0;
}

• Subtask 1: 27 / 27
• Subtask 2: 31 / 31
• Subtask 3: 42 / 42