oj.uz

Submission #536090

# Submission time Handle Problem Language Result Execution time Memory
536090 2022-03-12T10:41:26 Z blue Meetings (JOI19_meetings) C++17
29 / 100
 1825 ms 1064 KB 
#include "meetings.h"
#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
using namespace std;

using vi = vector<int>;
#define sz(x) int(x.size())

const int mx = 2'000;
int N;

set<int> edge[mx];

void cut(int u, int v)
{
	edge[u].erase(v);
	edge[v].erase(u);
}

void join(int u, int v)
{
	edge[u].insert(v);
	edge[v].insert(u);
}


vi subtree;
vi depth;
int goodct;

void dfs(int u, int p, vi& good)
{
	goodct++;
	for(int v : edge[u])
	{
		if(v == p) continue;
		if(!good[v]) continue;

		depth[v] = depth[u] + 1;
		dfs(v, u, good);
		subtree[u] += subtree[v];
	}
}

vi childlist;

vi added(mx, 0);



void computelist(int u, int p, vi& newgood, vi& oldgood)
{
	newgood[u] = 1;
	for(int v : edge[u])
	{
		if(v == p) continue;
		if(!oldgood[v]) continue;

		computelist(v, u, newgood, oldgood);
	}
}



void Locate(vi good, int X)
{
	// cerr << "Locate " << X << "  ";
	// for(int f = 0; f < N; f++) cerr << good[f] << ' ';
	// 	cerr << "\n";
	subtree = vi(N, 1);
	depth = vi(N, 1);
	int rt = 0;
	while(!good[rt]) rt++;

	goodct = 0;

	dfs(rt, rt, good);

	int cent = -1;
	for(int i = 0; i < N; i++)
	{
		if(!good[i]) continue;

		if(2*subtree[i] < goodct) continue;

		if(cent == -1) cent = i;
		else if(depth[i] > depth[cent]) cent = i;
	}

	childlist.clear();

	for(int x : edge[cent])
		if(good[x])
			childlist.push_back(x);

	int desc = -1;


	for(int h = 0; h+1 < sz(childlist); h++)
	{
		int A = childlist[h], B = childlist[h+1];

		int Q = Query(A, B, X);

		if(Q == A)
		{
			desc = A;
			break;
		}
		else if(Q == B)
		{
			desc = B;
			break;
		}
		else if(Q == cent)
		{
			continue;
		}
		else if(Q == X)
		{
			int Q2 = Query(cent, X, A);
			if(Q2 == X)
			{
				cut(cent, A);
				join(cent, X);
				join(A, X);

				added[X] = 1;

				return;
			}
			else
			{
				cut(cent, B);
				join(cent, X);
				join(B, X);

				added[X] = 1;

				return;
			}
		}
		else
		{
			int Q2 = Query(cent, Q, A);
			if(Q2 == Q)
			{
				cut(cent, A);
				join(cent, Q);
				join(Q, A);
				join(Q, X);

				added[Q] = added[X] = 1;
			}
			else
			{
				cut(cent, B);
				join(cent, Q);
				join(Q, B);
				join(Q, X);

				added[Q] = added[X] = 1;
			}

			return;
		}
	}

	if(desc == -1)
	{
		if(sz(childlist) % 2 == 1)
		{
			int z = childlist.back();

			int Q = Query(cent, z, X);

			if(Q == cent)
			{
				join(cent, X);

				added[X] = 1;

				return;
			}
			else if(Q == z)
			{
				desc = z;
			}
			else if(Q == X)
			{
				cut(cent, z);
				join(cent, X);
				join(X, z);

				added[X] = 1;

				return;
			}
			else
			{
				cut(cent, z);
				join(cent, Q);
				join(Q, X);
				join(Q, z);

				added[X] = added[Q] = 1;

				return;
			}
		}
		else
		{
			join(cent, X);

			added[X] = 1;

			return;
		}
	}

	vi goodlist(N, 0);
	computelist(desc, cent, goodlist, good);


	// cerr << "desc = " << desc << '\n';

	Locate(goodlist, X);
}

void Solve(int N_) 
{
	N = N_;

	edge[0].insert(1);
	edge[1].insert(0);

	added[0] = added[1] = 1;


	for(int X = 2; X <= N-1; X++)
	{
		if(added[X]) continue;
		// cerr << "original new\n";
		Locate(added, X);
	}

	for(int u = 0; u < N; u++)
		for(int v : edge[u])
			if(u < v)
				Bridge(u, v);
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 336 KB Output is correct
2 Correct 0 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 0 ms 336 KB Output is correct
5 Correct 0 ms 336 KB Output is correct
6 Correct 0 ms 336 KB Output is correct
7 Correct 0 ms 336 KB Output is correct
8 Correct 0 ms 336 KB Output is correct
9 Correct 0 ms 336 KB Output is correct
10 Correct 0 ms 336 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Correct 0 ms 336 KB Output is correct
13 Correct 0 ms 336 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 336 KB Output is correct
2 Correct 0 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 0 ms 336 KB Output is correct
5 Correct 0 ms 336 KB Output is correct
6 Correct 0 ms 336 KB Output is correct
7 Correct 0 ms 336 KB Output is correct
8 Correct 0 ms 336 KB Output is correct
9 Correct 0 ms 336 KB Output is correct
10 Correct 0 ms 336 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Correct 0 ms 336 KB Output is correct
13 Correct 0 ms 336 KB Output is correct
14 Correct 1 ms 464 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 1 ms 464 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 1 ms 464 KB Output is correct
20 Correct 1 ms 464 KB Output is correct
21 Correct 1 ms 336 KB Output is correct
22 Correct 1 ms 336 KB Output is correct
23 Correct 1 ms 464 KB Output is correct
24 Correct 1 ms 464 KB Output is correct
25 Correct 1 ms 464 KB Output is correct
26 Correct 1 ms 336 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 336 KB Output is correct
2 Correct 0 ms 336 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 0 ms 336 KB Output is correct
5 Correct 0 ms 336 KB Output is correct
6 Correct 0 ms 336 KB Output is correct
7 Correct 0 ms 336 KB Output is correct
8 Correct 0 ms 336 KB Output is correct
9 Correct 0 ms 336 KB Output is correct
10 Correct 0 ms 336 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Correct 0 ms 336 KB Output is correct
13 Correct 0 ms 336 KB Output is correct
14 Correct 1 ms 464 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 1 ms 464 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 1 ms 464 KB Output is correct
20 Correct 1 ms 464 KB Output is correct
21 Correct 1 ms 336 KB Output is correct
22 Correct 1 ms 336 KB Output is correct
23 Correct 1 ms 464 KB Output is correct
24 Correct 1 ms 464 KB Output is correct
25 Correct 1 ms 464 KB Output is correct
26 Correct 1 ms 336 KB Output is correct
27 Correct 9 ms 516 KB Output is correct
28 Correct 10 ms 464 KB Output is correct
29 Correct 11 ms 464 KB Output is correct
30 Correct 9 ms 512 KB Output is correct
31 Correct 7 ms 520 KB Output is correct
32 Correct 9 ms 464 KB Output is correct
33 Correct 12 ms 464 KB Output is correct
34 Correct 13 ms 508 KB Output is correct
35 Correct 13 ms 516 KB Output is correct
36 Correct 8 ms 464 KB Output is correct
37 Correct 12 ms 528 KB Output is correct
38 Correct 11 ms 536 KB Output is correct
39 Correct 9 ms 464 KB Output is correct

Subtask #4
0 / 71.0

# Verdict Execution time Memory Grader output
1 Correct 862 ms 1000 KB Output is correct
2 Correct 999 ms 1064 KB Output is correct
3 Correct 923 ms 1008 KB Output is correct
4 Correct 888 ms 876 KB Output is correct
5 Correct 496 ms 1032 KB Output is correct
6 Correct 441 ms 916 KB Output is correct
7 Correct 684 ms 976 KB Output is correct
8 Correct 886 ms 824 KB Output is correct
9 Correct 693 ms 912 KB Output is correct
10 Correct 732 ms 780 KB Output is correct
11 Correct 904 ms 896 KB Output is correct
12 Correct 700 ms 1056 KB Output is correct
13 Correct 831 ms 1008 KB Output is correct
14 Correct 1625 ms 984 KB Output is correct
15 Correct 1575 ms 936 KB Output is correct
16 Correct 1770 ms 964 KB Output is correct
17 Correct 624 ms 840 KB Output is correct
18 Incorrect 1825 ms 856 KB Wrong Answer [2]
19 Halted 0 ms 0 KB -