oj.uz

Submission #536092

# Submission time Handle Problem Language Result Execution time Memory
536092 2022-03-12T10:45:50 Z blue Meetings (JOI19_meetings) C++17
100 / 100
 904 ms 1164 KB 
#include "meetings.h"
#include <iostream>
#include <vector>
#include <algorithm>
#include <set>
#include <random>
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);

	sort(childlist.begin(), childlist.end(), [] (int p, int q)
	{
		return subtree[p] > subtree[q];
	});

	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;

	vi addlist;
	for(int X = 2; X <= N-1; X++)
		addlist.push_back(X);

	// for(int k = 0; k < 1'000'000; k++)
	// {
	// 	int u = rand() % sz(addlist);
	// 	int v = rand() % sz(addlist);
	// 	swap(addlist[u], addlist[v]);
	// }

	for(int X : addlist)
	{
		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 0 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 0 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 464 KB Output is correct
16 Correct 1 ms 464 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 1 ms 464 KB Output is correct
19 Correct 1 ms 460 KB Output is correct
20 Correct 1 ms 336 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 336 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 0 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 464 KB Output is correct
16 Correct 1 ms 464 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 1 ms 464 KB Output is correct
19 Correct 1 ms 460 KB Output is correct
20 Correct 1 ms 336 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 336 KB Output is correct
26 Correct 1 ms 336 KB Output is correct
27 Correct 7 ms 464 KB Output is correct
28 Correct 7 ms 464 KB Output is correct
29 Correct 8 ms 528 KB Output is correct
30 Correct 7 ms 464 KB Output is correct
31 Correct 6 ms 516 KB Output is correct
32 Correct 8 ms 464 KB Output is correct
33 Correct 13 ms 464 KB Output is correct
34 Correct 15 ms 464 KB Output is correct
35 Correct 15 ms 464 KB Output is correct
36 Correct 8 ms 524 KB Output is correct
37 Correct 12 ms 464 KB Output is correct
38 Correct 12 ms 464 KB Output is correct
39 Correct 8 ms 540 KB Output is correct

Subtask #4
71.0 / 71.0

# Verdict Execution time Memory Grader output
1 Correct 533 ms 1028 KB Output is correct
2 Correct 527 ms 980 KB Output is correct
3 Correct 543 ms 1088 KB Output is correct
4 Correct 543 ms 888 KB Output is correct
5 Correct 488 ms 884 KB Output is correct
6 Correct 380 ms 840 KB Output is correct
7 Correct 632 ms 864 KB Output is correct
8 Correct 707 ms 1040 KB Output is correct
9 Correct 779 ms 988 KB Output is correct
10 Correct 696 ms 796 KB Output is correct
11 Correct 808 ms 904 KB Output is correct
12 Correct 598 ms 1040 KB Output is correct
13 Correct 578 ms 1004 KB Output is correct
14 Correct 803 ms 936 KB Output is correct
15 Correct 713 ms 820 KB Output is correct
16 Correct 768 ms 912 KB Output is correct
17 Correct 756 ms 792 KB Output is correct
18 Correct 627 ms 884 KB Output is correct
19 Correct 669 ms 908 KB Output is correct
20 Correct 798 ms 1008 KB Output is correct
21 Correct 881 ms 1068 KB Output is correct
22 Correct 811 ms 908 KB Output is correct
23 Correct 837 ms 928 KB Output is correct
24 Correct 825 ms 932 KB Output is correct
25 Correct 745 ms 908 KB Output is correct
26 Correct 733 ms 1024 KB Output is correct
27 Correct 749 ms 932 KB Output is correct
28 Correct 828 ms 852 KB Output is correct
29 Correct 699 ms 860 KB Output is correct
30 Correct 702 ms 864 KB Output is correct
31 Correct 769 ms 836 KB Output is correct
32 Correct 904 ms 1096 KB Output is correct
33 Correct 590 ms 1164 KB Output is correct
34 Correct 8 ms 464 KB Output is correct
35 Correct 8 ms 464 KB Output is correct
36 Correct 11 ms 464 KB Output is correct
37 Correct 9 ms 464 KB Output is correct
38 Correct 8 ms 516 KB Output is correct
39 Correct 9 ms 508 KB Output is correct
40 Correct 14 ms 516 KB Output is correct
41 Correct 16 ms 464 KB Output is correct
42 Correct 21 ms 464 KB Output is correct
43 Correct 8 ms 464 KB Output is correct
44 Correct 12 ms 464 KB Output is correct
45 Correct 11 ms 464 KB Output is correct
46 Correct 13 ms 464 KB Output is correct
47 Correct 1 ms 336 KB Output is correct
48 Correct 1 ms 336 KB Output is correct
49 Correct 1 ms 464 KB Output is correct
50 Correct 1 ms 464 KB Output is correct
51 Correct 1 ms 464 KB Output is correct
52 Correct 1 ms 336 KB Output is correct
53 Correct 1 ms 336 KB Output is correct
54 Correct 1 ms 336 KB Output is correct
55 Correct 1 ms 336 KB Output is correct
56 Correct 1 ms 464 KB Output is correct
57 Correct 1 ms 464 KB Output is correct
58 Correct 1 ms 464 KB Output is correct
59 Correct 1 ms 464 KB Output is correct
60 Correct 1 ms 336 KB Output is correct
61 Correct 1 ms 336 KB Output is correct
62 Correct 1 ms 336 KB Output is correct
63 Correct 0 ms 336 KB Output is correct
64 Correct 0 ms 336 KB Output is correct
65 Correct 1 ms 336 KB Output is correct
66 Correct 0 ms 336 KB Output is correct
67 Correct 0 ms 336 KB Output is correct
68 Correct 0 ms 336 KB Output is correct
69 Correct 0 ms 336 KB Output is correct
70 Correct 0 ms 336 KB Output is correct
71 Correct 0 ms 336 KB Output is correct
72 Correct 0 ms 336 KB Output is correct