oj.uz

Submission #201065

# Submission time Handle Problem Language Result Execution time Memory
201065 2020-02-09T09:30:32 Z extraterrestrial Meetings (JOI19_meetings) C++14
29 / 100
 2000 ms 17336 KB 
#include "meetings.h"
#include <bits/stdc++.h>
typedef long long ll;
typedef long double ld;
using namespace std;
#define F first
#define S second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define SZ(x) (int)(x).size()
mt19937 rnd(228);

const int N = 2010;
int lca[N][N], used[N], timer;
bitset<N> dk[N], em, cur[18], kek;
int get(int a, int b) {
	if (a > b) {
		swap(a, b);
	}
	return lca[a][b];
}

void update_lca(int a, int b, int c) {
	if (a > b) {
		swap(a, b);
	}
	if (lca[a][b] != -1) {
		assert(lca[a][b] == c);
	}
	lca[a][b] = c;
	dk[a][b] = dk[b][a] = 0;
}

vector<pair<int, int>> edge;

void dfs(int root, vector<int> have) {
	if (have.empty()) {
		return;
	}
	for (int i = 0; i < 18; i++) {
		cur[i] = em;
	}
	shuffle(all(have), rnd);
	vector<vector<int>> nh(1);
	vector<int> up(1);
	nh[0].pb(have[0]);
	up[0] = have[0];
	cur[0][have[0]] = 1;
	timer++;
	used[have[0]] = timer;
	for (int i = 1; i < SZ(have); i++) {
		if (used[have[i]] == timer) {
			continue;
		}
		used[have[i]] = timer;
		bool ok = false;
		vector<int> order;
		for (int j = 0; j < SZ(nh); j++) {
			order.pb(j);
		}
		shuffle(all(order), rnd);
		for (int j : order) {
			if (ok) {
				break;
			}
			int v;
			if (get(up[j], have[i]) != -1) {
				v = get(up[j], have[i]);
			}
			else {
				v = Query(root, up[j], have[i]);
			}
			if (v != root) {
				if (v == up[j]) {
					update_lca(v, up[j], up[j]);
					nh[j].pb(have[i]);
					cur[j][have[i]] = 1;
					ok = true;
					break;
				}
				else {
					kek = dk[have[i]] & cur[j];
					int cnt = kek.count();
					for (int iter = 0; iter < cnt; iter++) {
						int pos = kek._Find_first();
						kek[pos] = 0;
						update_lca(pos, have[i], v);
					}
					kek = dk[v] & cur[j];
					cnt = kek.count();
					for (int iter = 0; iter < cnt; iter++) {
						int pos = kek._Find_first();
						kek[pos] = 0;
						update_lca(pos, v, v);
					}
					update_lca(have[i], v, v);
					used[v] = timer;
					up[j] = v;
					nh[j].pb(have[i]);
					cur[j][have[i]] = 1;
					if (v != have[i]) {
						nh[j].pb(v);
						cur[j][v] = 1;
					}
					ok = true;
					break;
				}
			}
		}
		if (!ok) {
			nh.pb({have[i]});
			up.pb(have[i]);
		}
	}
	for (auto it : up) {
		edge.pb({root, it});
	}
	for (int i = 0; i < SZ(nh); i++) {
		for (int j = 0; j < SZ(nh[i]); j++) {
			if (nh[i][j] == up[i]) {
				nh[i].erase(nh[i].begin() + j);
				break;
			}
		}
		dfs(up[i], nh[i]);
	}
}

void Solve(int n) {
  for (int i = 0; i < n; i++) {
  	for (int j = 0; j < n; j++) {
  		if (i == j) {
  			lca[i][j] = i;
  		}
  		else {
  			lca[i][j] = -1;
  			dk[i][j] = dk[j][i] = 1;
  		}
  	}
  }
  int root = rnd() % n;
  vector<int> have;
  for (int i = 0; i < n; i++) {
  	if (i != root) {
  		have.pb(i);
  	}
  }
  dfs(root, have);
  for (auto &it : edge) {
  	if (it.F > it.S) {
  		swap(it.F, it.S);
  	}
  	Bridge(it.F, it.S);
  }
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 504 KB Output is correct
10 Correct 5 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Correct 5 ms 376 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 504 KB Output is correct
10 Correct 5 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 5 ms 500 KB Output is correct
15 Correct 5 ms 504 KB Output is correct
16 Correct 5 ms 632 KB Output is correct
17 Correct 6 ms 504 KB Output is correct
18 Correct 5 ms 504 KB Output is correct
19 Correct 6 ms 504 KB Output is correct
20 Correct 5 ms 504 KB Output is correct
21 Correct 6 ms 632 KB Output is correct
22 Correct 5 ms 632 KB Output is correct
23 Correct 5 ms 632 KB Output is correct
24 Correct 6 ms 632 KB Output is correct
25 Correct 6 ms 636 KB Output is correct
26 Correct 6 ms 632 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 5 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 504 KB Output is correct
10 Correct 5 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 5 ms 500 KB Output is correct
15 Correct 5 ms 504 KB Output is correct
16 Correct 5 ms 632 KB Output is correct
17 Correct 6 ms 504 KB Output is correct
18 Correct 5 ms 504 KB Output is correct
19 Correct 6 ms 504 KB Output is correct
20 Correct 5 ms 504 KB Output is correct
21 Correct 6 ms 632 KB Output is correct
22 Correct 5 ms 632 KB Output is correct
23 Correct 5 ms 632 KB Output is correct
24 Correct 6 ms 632 KB Output is correct
25 Correct 6 ms 636 KB Output is correct
26 Correct 6 ms 632 KB Output is correct
27 Correct 22 ms 2040 KB Output is correct
28 Correct 22 ms 2040 KB Output is correct
29 Correct 25 ms 2040 KB Output is correct
30 Correct 27 ms 2168 KB Output is correct
31 Correct 19 ms 2040 KB Output is correct
32 Correct 24 ms 2040 KB Output is correct
33 Correct 28 ms 2040 KB Output is correct
34 Correct 29 ms 2040 KB Output is correct
35 Correct 31 ms 2040 KB Output is correct
36 Correct 24 ms 2040 KB Output is correct
37 Correct 167 ms 2680 KB Output is correct
38 Correct 100 ms 2552 KB Output is correct
39 Correct 133 ms 2628 KB Output is correct

Subtask #4
0 / 71.0

# Verdict Execution time Memory Grader output
1 Execution timed out 2263 ms 17336 KB Time limit exceeded
2 Halted 0 ms 0 KB -