oj.uz

Submission #524992

# Submission time Handle Problem Language Result Execution time Memory
524992 2022-02-10T12:01:39 Z blue IOI Fever (JOI21_fever) C++17
0 / 100
 38 ms 77088 KB 
#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
#include <map>
using namespace std;

using mii = map<int, int>;
using vi = vector<int>;
using pii = pair<int, int>;
#define sz(x) int(x.size())

const int dr = 0;
const int dt = 1;
const int dl = 2;
const int dd = 3;

int* X;
int* Y;

struct person
{
	int i;
	int x;
	int y;

	person(int I)
	{
		i = I, x = X[I], y = Y[I];
	}

	person(int X, int Y)
	{
		x = X, y = Y, i = -1;
	}
};

bool operator < (person A, person B)
{
	if(A.x != B.x) return A.x < B.x;
	else return A.y < B.y;
}


struct event
{
	int t;

	int i;
	int p;
};

bool operator < (event A, event B)
{
	return vi{A.t, A.i, A.p} < vi{B.t, B.i, B.p};
}



const int mx = 100'000;

vi L_label(mx), T_label(mx), TL_label(mx), TR_label(mx);
mii L_map, T_map, TL_map, TR_map;
set<person> L_set[mx][4], T_set[mx][4], TL_set[mx][4], TR_set[mx][4];
vi dir;
vi visit;

set<event> tbv;

void activate(event z);
void reload(int i);


void activate(event z)
{
	int t = z.t, i = z.i, p = z.p;

	// cerr << "activate " << t << ' ' << i << ' ' << p << "\n";

	L_set[L_label[i]][dir[i]].erase(person(i));
	T_set[T_label[i]][dir[i]].erase(person(i));
	TL_set[TL_label[i]][dir[i]].erase(person(i));
	TR_set[TR_label[i]][dir[i]].erase(person(i));

	reload(p);
	reload(i);
}

void add_event(int i, int p)
{
	int t;
	if(X[i] == X[p]) t = abs(Y[i] - Y[p])/2;
	else if(Y[i] == Y[p]) t = abs(X[i] - X[p])/2;
	else t = abs(X[i] - X[p]);

	visit[i] = 1;
	tbv.insert({t, i, p});
}

void reload(int p)
{
	// cerr << "reload " << p << "\n";

	if(dir[p] == dt)
	{
		// cerr << "hi\n";
		// auto it = T_set[T_label[p]][dd].lower_bound(person(p));
		// if(it != T_set[T_label[p]][dd].begin())
		// {
		// 	it--;
		// 	int i = it->i;
		// 	add_event(it->i, i);
		// 	T_set[T_label[p]][dd].erase(it);
		// }

		set<person>& z = TL_set[TL_label[p]][dr];




		auto it = z.lower_bound(person(p));
		if(it != z.begin())
		{
			it--;
			add_event(it->i, p);
			// cerr << "# " << it->i << '\n';
		}

		z = TR_set[TR_label[p]][dl];
		it = z.lower_bound(person(p));

		// cerr << "coords = " << X[0]-Y[0] << ' ' << X[1]-Y[1] << ' ' << X[2]-Y[2] << '\n';

		// cerr << "z = ";
		// for(person q : z) cerr << q.i << " / ";
		// 	cerr << '\n';

		if(it != z.end())
		{
			add_event(it->i, p);
			// cerr << "#\n";
		}
	}
	else if(dir[p] == dd)
	{
		set<person>& z = TL_set[TL_label[p]][dr];
		auto it = z.lower_bound(person(p));
		if(it != z.end())
		{
			add_event(it->i, p);
		}

		z = TR_set[TR_label[p]][dl];
		it = z.lower_bound(person(p));
		if(it != z.begin())
		{
			it--;
			add_event(it->i, p);
		}
	}
	else if(dir[p] == dl)
	{
		set<person>& z = TL_set[TL_label[p]][dd];
		auto it = z.lower_bound(person(p));
		if(it != z.begin())
		{
			it--;
			add_event(it->i, p);
		}

		z = TR_set[TR_label[p]][dt];
		it = z.lower_bound(person(p));
		if(it != z.begin())
		{
			it--;
			add_event(it->i, p);
		}
	}
	else if(dir[p] == dr)
	{
		set<person>& z = TL_set[TL_label[p]][dt];
		auto it = z.lower_bound(person(p));
		if(it != z.end())
		{
			add_event(it->i, p);
		}

		z = TR_set[TR_label[p]][dd];
		it = z.lower_bound(person(p));
		if(it != z.end())
		{
			add_event(it->i, p);
		}
	}
}



int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);


	int N;
	cin >> N;

	X = new int[N];
	Y = new int[N];
	for(int i = 0; i < N; i++) 
	{
		cin >> X[i] >> Y[i];
		X[i] *= 2;
		Y[i] *= 2;
	}

	int res = 1;

	for(int i = N-1; i >= 0; i--)
	{
		X[i] -= X[0];
		Y[i] -= Y[0];
	}

	// cerr << X[0] << ' ' << X[1] << ' ' << X[2] << '\n';
	// cerr << Y[0] << ' ' << Y[1] << ' ' << Y[2] << '\n';

	for(int t = 0; t < 4; t++)
	{

// if(t == 1)
// {
		L_map.clear();
		T_map.clear();
		TL_map.clear();
		TR_map.clear();

		for(int i = 0; i < N; i++)
		{
			L_map[X[i]] = 0;
			T_map[Y[i]] = 0;
			TL_map[X[i]+Y[i]] = 0;
			TR_map[X[i]-Y[i]] = 0;
		}

		for(mii* mp : {&L_map, &T_map, &TL_map, &TR_map})
		{
			mii& m = *mp;

			int ct = -1;

			for(auto& z : m)
			{
				z.second = ++ct;
			}
		}


		for(int i = 0; i < N; i++)
		{
			L_label[i] = L_map[X[i]];
			T_label[i] = T_map[Y[i]];
			TL_label[i] = TL_map[X[i] + Y[i]];
			TR_label[i] = TR_map[X[i] - Y[i]];
		}	

		//0 = right, 1 = top, 2 = left, 3 = down

		dir = vi(N);
		dir[0] = dt;


		for(int i = 1; i < N; i++)
		{
			if(Y[i] > 0 && X[i]+Y[i] > 0 && Y[i]-X[i] > 0)
				dir[i] = dd;
			else if(Y[i] < 0 && X[i]+Y[i] <= 0 && Y[i]-X[i] <= 0)
				dir[i] = dt;
			else if(X[i] < 0)
				dir[i] = dr;
			else if(X[i] > 0)
				dir[i] = dl;
		}

		// cerr << dir[0] << ' ' << dir[1] << ' ' << dir[2] << '\n';


		visit = vi(N, 0);

		for(int i = 0; i < N; i++)
		{
			for(int d = 0; d < 4; d++)
			{
				L_set[i][d].clear();
				T_set[i][d].clear();
				TL_set[i][d].clear();
				TR_set[i][d].clear();
			}
		}
		
		for(int i = 0; i < N; i++)
		{
			L_set[L_label[i]][dir[i]].insert(person(i));
			T_set[T_label[i]][dir[i]].insert(person(i));
			TL_set[TL_label[i]][dir[i]].insert(person(i));
			TR_set[TR_label[i]][dir[i]].insert(person(i));
		}





		tbv.insert({0, 0, 0});

		visit[0] = 1;

		while(!tbv.empty())
		{
			event x = *tbv.begin();
			tbv.erase(x);

			activate(x);
		}


		int curr = 0;
		for(int i = 0; i < N; i++) curr += visit[i];

		res = max(res, curr);




// }


		for(int i = 0; i < N; i++)
		{
			int newX = -Y[i], newY = X[i];
			X[i] = newX;
			Y[i] = newY;
		}
	}

	cout << res << '\n';
}

Compilation message

fever.cpp: In function 'void activate(event)':
fever.cpp:76:6: warning: unused variable 't' [-Wunused-variable]
   76 |  int t = z.t, i = z.i, p = z.p;
      |      ^

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 76996 KB Output is correct
2 Correct 34 ms 77004 KB Output is correct
3 Correct 34 ms 77036 KB Output is correct
4 Correct 34 ms 76936 KB Output is correct
5 Correct 34 ms 76956 KB Output is correct
6 Correct 36 ms 77040 KB Output is correct
7 Correct 36 ms 76904 KB Output is correct
8 Correct 35 ms 76992 KB Output is correct
9 Correct 34 ms 76928 KB Output is correct
10 Correct 34 ms 76968 KB Output is correct
11 Correct 34 ms 76996 KB Output is correct
12 Correct 35 ms 76944 KB Output is correct
13 Correct 35 ms 76956 KB Output is correct
14 Correct 34 ms 77016 KB Output is correct
15 Correct 34 ms 77044 KB Output is correct
16 Correct 38 ms 76992 KB Output is correct
17 Incorrect 37 ms 77020 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 76996 KB Output is correct
2 Correct 34 ms 77004 KB Output is correct
3 Correct 34 ms 77036 KB Output is correct
4 Correct 34 ms 76936 KB Output is correct
5 Correct 34 ms 76956 KB Output is correct
6 Correct 36 ms 77040 KB Output is correct
7 Correct 36 ms 76904 KB Output is correct
8 Correct 35 ms 76992 KB Output is correct
9 Correct 34 ms 76928 KB Output is correct
10 Correct 34 ms 76968 KB Output is correct
11 Correct 34 ms 76996 KB Output is correct
12 Correct 35 ms 76944 KB Output is correct
13 Correct 35 ms 76956 KB Output is correct
14 Correct 34 ms 77016 KB Output is correct
15 Correct 34 ms 77044 KB Output is correct
16 Correct 38 ms 76992 KB Output is correct
17 Incorrect 37 ms 77020 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #3
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 36 ms 76980 KB Output is correct
2 Correct 35 ms 76968 KB Output is correct
3 Correct 35 ms 76980 KB Output is correct
4 Incorrect 37 ms 77088 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 76996 KB Output is correct
2 Correct 34 ms 77004 KB Output is correct
3 Correct 34 ms 77036 KB Output is correct
4 Correct 34 ms 76936 KB Output is correct
5 Correct 34 ms 76956 KB Output is correct
6 Correct 36 ms 77040 KB Output is correct
7 Correct 36 ms 76904 KB Output is correct
8 Correct 35 ms 76992 KB Output is correct
9 Correct 34 ms 76928 KB Output is correct
10 Correct 34 ms 76968 KB Output is correct
11 Correct 34 ms 76996 KB Output is correct
12 Correct 35 ms 76944 KB Output is correct
13 Correct 35 ms 76956 KB Output is correct
14 Correct 34 ms 77016 KB Output is correct
15 Correct 34 ms 77044 KB Output is correct
16 Correct 38 ms 76992 KB Output is correct
17 Incorrect 37 ms 77020 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #5
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 76996 KB Output is correct
2 Correct 34 ms 77004 KB Output is correct
3 Correct 34 ms 77036 KB Output is correct
4 Correct 34 ms 76936 KB Output is correct
5 Correct 34 ms 76956 KB Output is correct
6 Correct 36 ms 77040 KB Output is correct
7 Correct 36 ms 76904 KB Output is correct
8 Correct 35 ms 76992 KB Output is correct
9 Correct 34 ms 76928 KB Output is correct
10 Correct 34 ms 76968 KB Output is correct
11 Correct 34 ms 76996 KB Output is correct
12 Correct 35 ms 76944 KB Output is correct
13 Correct 35 ms 76956 KB Output is correct
14 Correct 34 ms 77016 KB Output is correct
15 Correct 34 ms 77044 KB Output is correct
16 Correct 38 ms 76992 KB Output is correct
17 Incorrect 37 ms 77020 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #6
0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 76996 KB Output is correct
2 Correct 34 ms 77004 KB Output is correct
3 Correct 34 ms 77036 KB Output is correct
4 Correct 34 ms 76936 KB Output is correct
5 Correct 34 ms 76956 KB Output is correct
6 Correct 36 ms 77040 KB Output is correct
7 Correct 36 ms 76904 KB Output is correct
8 Correct 35 ms 76992 KB Output is correct
9 Correct 34 ms 76928 KB Output is correct
10 Correct 34 ms 76968 KB Output is correct
11 Correct 34 ms 76996 KB Output is correct
12 Correct 35 ms 76944 KB Output is correct
13 Correct 35 ms 76956 KB Output is correct
14 Correct 34 ms 77016 KB Output is correct
15 Correct 34 ms 77044 KB Output is correct
16 Correct 38 ms 76992 KB Output is correct
17 Incorrect 37 ms 77020 KB Output isn't correct
18 Halted 0 ms 0 KB -

Subtask #7
0 / 31.0

# Verdict Execution time Memory Grader output
1 Correct 34 ms 76996 KB Output is correct
2 Correct 34 ms 77004 KB Output is correct
3 Correct 34 ms 77036 KB Output is correct
4 Correct 34 ms 76936 KB Output is correct
5 Correct 34 ms 76956 KB Output is correct
6 Correct 36 ms 77040 KB Output is correct
7 Correct 36 ms 76904 KB Output is correct
8 Correct 35 ms 76992 KB Output is correct
9 Correct 34 ms 76928 KB Output is correct
10 Correct 34 ms 76968 KB Output is correct
11 Correct 34 ms 76996 KB Output is correct
12 Correct 35 ms 76944 KB Output is correct
13 Correct 35 ms 76956 KB Output is correct
14 Correct 34 ms 77016 KB Output is correct
15 Correct 34 ms 77044 KB Output is correct
16 Correct 38 ms 76992 KB Output is correct
17 Incorrect 37 ms 77020 KB Output isn't correct
18 Halted 0 ms 0 KB -