Submission #213131

#	Time	Username	Problem	Language	Result	Execution time	Memory
213131		ainta	Hamburg Steak (JOI20_hamburg)	C++17	15 / 100	228 ms	4356 KiB

hamburg

#include<cstdio>
#include<algorithm>
#include<vector>
#define N_ 201000
using namespace std;
int K, C[N_];
struct Rect {
	int bx, by, ex, ey;
};
vector<Rect>w;
struct point {
	int x, y;
}U[5];
bool Inside(Rect a, point b) {
	return a.bx <= b.x&&b.x <= a.ex&&a.by <= b.y&&b.y <= a.ey;
}
void Print(point a) {
	printf("%d %d\n", a.x, a.y);
}
void Do(int pv, int n) {
	int i;
	if (pv) {
		for (i = 0; i < n; i++)if (Inside(w[i], U[pv - 1]))C[i]++;
	}
	if (pv == K) {
		for (i = 0; i < n; i++) if (!C[i])break;
		if (i >= n) {
			for (i = 0; i < K; i++)Print(U[i]);
			exit(0);
		}
		for (i = 0; i < n; i++)if (Inside(w[i], U[pv - 1]))C[i]--;
		return;
	}
	int Ax = 0, Bx = 1e9, Ay = 0, By = 1e9;
	for (i = 0; i < n; i++) {
		if (C[i])continue;
		Ax = max(Ax, w[i].bx);
		Ay = max(Ay, w[i].by);
		Bx = min(Bx, w[i].ex);
		By = min(By, w[i].ey);
	}
	if (pv == K - 1) {
		if (Ax <= Bx && Ay <= By) {
			U[pv] = { Ax,Ay };
			Do(pv + 1, n);
		}
		else {
			if (pv) for (i = 1; i <= n; i++)if (Inside(w[i], U[pv - 1]))C[i]--;
			return;
		}
	}
	int yy1 = 0, yy2 = 1e9, yy3 = 0, yy4 = 1e9;
	int xx1 = 0, xx2 = 1e9, xx3 = 0, xx4 = 1e9;
	for (i = 0; i < n; i++) {
		if (C[i])continue;
		if (w[i].bx <= Bx) {
			yy1 = max(yy1, w[i].by);
			yy2 = min(yy2, w[i].ey);
		}
		if (w[i].ex >= Ax) {
			yy3 = max(yy3, w[i].by);
			yy4 = min(yy4, w[i].ey);
		}
		if (w[i].by <= By) {
			xx1 = max(xx1, w[i].bx);
			xx2 = min(xx2, w[i].ex);
		}
		if (w[i].ey >= Ay) {
			xx3 = max(xx3, w[i].bx);
			xx4 = min(xx4, w[i].ex);
		}
	}
	U[pv] = { Bx, yy1 };
	Do(pv + 1, n);
	U[pv] = { Bx, yy2 };
	Do(pv + 1, n);
	U[pv] = { Ax, yy3 };
	Do(pv + 1, n);
	U[pv] = { Ax, yy4 };
	Do(pv + 1, n);
	if (pv) {
		for (i = 0; i < n; i++)if (Inside(w[i], U[pv - 1]))C[i]--;
	}
}
int main() {
	int i, n;
	scanf("%d%d", &n, &K);
	w.resize(n);
	for (i = 0; i < n; i++) {
		scanf("%d%d%d%d", &w[i].bx, &w[i].by, &w[i].ex, &w[i].ey);
	}	
	Do(0, n);

	std::sort(w.begin(),w.end(), [](auto const& l, auto const& r) {
		return l.bx < r.bx;
	});
	int Ax = 0, Bx = 1e9, Ay = 0, By = 1e9;
	for (i = n-1; i >= 0; i--) {
		Ax = max(Ax, w[i].bx);
		Ay = max(Ay, w[i].by);
		Bx = min(Bx, w[i].ex);
		By = min(By, w[i].ey);
		if (Ax > Bx || Ay > By)break;
	}
	int pv = i; Ax = 0, Bx = 1e9, Ay = 0, By = 1e9;
	for (i = n-1; i > pv; i--) {
		Ax = max(Ax, w[i].bx);
		Ay = max(Ay, w[i].by);
		Bx = min(Bx, w[i].ex);
		By = min(By, w[i].ey);
	}
	U[0] = { Ax,Ay };
	for (i = 0; i < n; i++)if (Inside(w[i], U[0]))C[i]++;
	Do(1, n);
	for (i = 0; i < n; i++)C[i] = 0;

	std::sort(w.begin(), w.end(), [](auto const& l, auto const& r) {
		return l.ex > r.ex;
	});

	Ax = 0, Bx = 1e9, Ay = 0, By = 1e9;
	for (i = n - 1; i >= 0; i--) {
		Ax = max(Ax, w[i].bx);
		Ay = max(Ay, w[i].by);
		Bx = min(Bx, w[i].ex);
		By = min(By, w[i].ey);
		if (Ax > Bx || Ay > By)break;
	}
	pv = i; Ax = 0, Bx = 1e9, Ay = 0, By = 1e9;
	for (i = n - 1; i > pv; i--) {
		Ax = max(Ax, w[i].bx);
		Ay = max(Ay, w[i].by);
		Bx = min(Bx, w[i].ex);
		By = min(By, w[i].ey);
	}
	U[0] = { Ax,Ay };
	for (i = 0; i < n; i++)if (Inside(w[i], U[0]))C[i]++;
	Do(1, n);
	for (i = 0; i < n; i++)C[i] = 0;


}

Compilation message (stderr)

hamburg.cpp: In function 'int main()':
hamburg.cpp:87:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   87 |  scanf("%d%d", &n, &K);
      |  ~~~~~^~~~~~~~~~~~~~~~
hamburg.cpp:90:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   90 |   scanf("%d%d%d%d", &w[i].bx, &w[i].by, &w[i].ex, &w[i].ey);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 1 / 1
• Subtask 3: 3 / 3
• Subtask 4: 0 / 6
• Subtask 5: 1 / 1
• Subtask 6: 3 / 3
• Subtask 7: 6 / 6
• Subtask 8: 0 / 79