oj.uz

Submission #936575

# Submission time Handle Problem Language Result Execution time Memory
936575 2024-03-02T08:33:41 Z XXBabaProBerkay Railway (BOI17_railway) C++11
100 / 100
 140 ms 27208 KB 
#include <bits/stdc++.h>
using namespace std;
 
#define F first
#define S second
 
using ll = long long;
 
const int INF = 1e9 + 7;

int K, t = 0;
vector<int> d, ans, res, dpth;
vector<array<int, 20>> up;
vector<vector<pair<int, int>>> adj;

void dfs(int k, int p)
{
	up[k][0] = p;
	for (int i = 1; i < 20; i++)
		up[k][i] = up[up[k][i - 1]][i - 1];

	d[k] = ++t;
	for (auto i : adj[k])
	{
		if (i.F == p)
			continue;

		dpth[i.F] = dpth[k] + 1;
		dfs(i.F, k);
	}
}

void dfs2(int k, int p)
{
	int x;
	for (auto i : adj[k])
	{
		if (i.F == p)
		{
			x = i.S;
			continue;
		}

		dfs2(i.F, k);
		ans[k] += ans[i.F];
	}

	if (ans[k] >= K)
		res.push_back(x);
}

int kth_ancestor(int a, int k)
{
	for (int i = 0; i < 20; i++)
		if (k & (1 << i))
			a = up[a][i];

	return a;
}

int lca(int a, int b)
{
	if (dpth[a] < dpth[b])
		swap(a, b);

	a = kth_ancestor(a, dpth[a] - dpth[b]);

	if (a == b)
		return a;

	for (int i = 19; i >= 0; i--)
		if (up[a][i] != up[b][i])
			a = up[a][i], b = up[b][i];

	return up[a][0];
}

bool comp(int a, int b)
{
	return d[a] < d[b];
}

int main()
{
	//cin.tie(0) -> sync_with_stdio(0);

	int n, m;
	cin >> n >> m >> K;
	d.resize(n + 1);
	up.resize(n + 1);
	adj.resize(n + 1);
	ans.resize(n + 1);
	dpth.resize(n + 1);
	for (int i = 0; i < n - 1; i++)
	{
		int a, b;
		cin >> a >> b;
		adj[a].emplace_back(b, i + 1);
		adj[b].emplace_back(a, i + 1);
	}

	dfs(1, 0);

	while (m--)
	{
		int s;
		cin >> s;
		vector<int> a(s);
		for (int &i : a) cin >> i;

		sort(a.begin(), a.end(), comp);

		ans[a[0]]++;
		int LCA = a[0];
		for (int i = 1; i < s; i++)
		{
			ans[a[i]]++;
			ans[lca(a[i], a[i - 1])]--;
			LCA = lca(LCA, a[i]);
		}

		ans[LCA]--;
	}

	dfs2(1, 0);

	sort(res.begin(), res.end());

	cout << res.size() << '\n';
	for (int i : res)
		cout << i << ' ';

	cout << '\n';
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 7 ms 2060 KB Output is correct
3 Correct 7 ms 1884 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 7 ms 2396 KB Output is correct
7 Correct 7 ms 2140 KB Output is correct
8 Correct 6 ms 2020 KB Output is correct
9 Correct 6 ms 1880 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 7 ms 2060 KB Output is correct
3 Correct 7 ms 1884 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 7 ms 2396 KB Output is correct
7 Correct 7 ms 2140 KB Output is correct
8 Correct 6 ms 2020 KB Output is correct
9 Correct 6 ms 1880 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 33 ms 2396 KB Output is correct
16 Correct 33 ms 2396 KB Output is correct
17 Correct 29 ms 2420 KB Output is correct
18 Correct 8 ms 2572 KB Output is correct
19 Correct 7 ms 2140 KB Output is correct
20 Correct 30 ms 2396 KB Output is correct
21 Correct 32 ms 2396 KB Output is correct
22 Correct 0 ms 344 KB Output is correct
23 Correct 7 ms 1884 KB Output is correct
24 Correct 7 ms 1884 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 344 KB Output is correct
27 Correct 8 ms 2396 KB Output is correct
28 Correct 7 ms 2140 KB Output is correct
29 Correct 6 ms 1884 KB Output is correct
30 Correct 6 ms 1980 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 0 ms 344 KB Output is correct
35 Correct 0 ms 344 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 119 ms 27020 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 106 ms 26460 KB Output is correct
4 Correct 105 ms 25936 KB Output is correct
5 Correct 112 ms 26884 KB Output is correct
6 Correct 120 ms 27200 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 100 ms 21692 KB Output is correct
2 Correct 102 ms 17588 KB Output is correct
3 Correct 111 ms 17232 KB Output is correct
4 Correct 118 ms 17304 KB Output is correct
5 Correct 135 ms 17236 KB Output is correct
6 Correct 100 ms 21912 KB Output is correct
7 Correct 101 ms 21840 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 100 ms 21692 KB Output is correct
2 Correct 102 ms 17588 KB Output is correct
3 Correct 111 ms 17232 KB Output is correct
4 Correct 118 ms 17304 KB Output is correct
5 Correct 135 ms 17236 KB Output is correct
6 Correct 100 ms 21912 KB Output is correct
7 Correct 101 ms 21840 KB Output is correct
8 Correct 112 ms 21816 KB Output is correct
9 Correct 122 ms 22028 KB Output is correct
10 Correct 110 ms 27088 KB Output is correct
11 Correct 110 ms 26840 KB Output is correct
12 Correct 98 ms 16992 KB Output is correct
13 Correct 83 ms 16980 KB Output is correct
14 Correct 102 ms 17048 KB Output is correct
15 Correct 107 ms 17232 KB Output is correct
16 Correct 118 ms 17304 KB Output is correct
17 Correct 113 ms 17232 KB Output is correct
18 Correct 117 ms 17236 KB Output is correct
19 Correct 140 ms 17744 KB Output is correct
20 Correct 101 ms 22100 KB Output is correct
21 Correct 110 ms 22220 KB Output is correct
22 Correct 102 ms 22096 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 7 ms 2060 KB Output is correct
3 Correct 7 ms 1884 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 7 ms 2396 KB Output is correct
7 Correct 7 ms 2140 KB Output is correct
8 Correct 6 ms 2020 KB Output is correct
9 Correct 6 ms 1880 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 33 ms 2396 KB Output is correct
16 Correct 33 ms 2396 KB Output is correct
17 Correct 29 ms 2420 KB Output is correct
18 Correct 8 ms 2572 KB Output is correct
19 Correct 7 ms 2140 KB Output is correct
20 Correct 30 ms 2396 KB Output is correct
21 Correct 32 ms 2396 KB Output is correct
22 Correct 0 ms 344 KB Output is correct
23 Correct 7 ms 1884 KB Output is correct
24 Correct 7 ms 1884 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 0 ms 344 KB Output is correct
27 Correct 8 ms 2396 KB Output is correct
28 Correct 7 ms 2140 KB Output is correct
29 Correct 6 ms 1884 KB Output is correct
30 Correct 6 ms 1980 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 0 ms 348 KB Output is correct
34 Correct 0 ms 344 KB Output is correct
35 Correct 0 ms 344 KB Output is correct
36 Correct 119 ms 27020 KB Output is correct
37 Correct 1 ms 348 KB Output is correct
38 Correct 106 ms 26460 KB Output is correct
39 Correct 105 ms 25936 KB Output is correct
40 Correct 112 ms 26884 KB Output is correct
41 Correct 120 ms 27200 KB Output is correct
42 Correct 100 ms 21692 KB Output is correct
43 Correct 102 ms 17588 KB Output is correct
44 Correct 111 ms 17232 KB Output is correct
45 Correct 118 ms 17304 KB Output is correct
46 Correct 135 ms 17236 KB Output is correct
47 Correct 100 ms 21912 KB Output is correct
48 Correct 101 ms 21840 KB Output is correct
49 Correct 112 ms 21816 KB Output is correct
50 Correct 122 ms 22028 KB Output is correct
51 Correct 110 ms 27088 KB Output is correct
52 Correct 110 ms 26840 KB Output is correct
53 Correct 98 ms 16992 KB Output is correct
54 Correct 83 ms 16980 KB Output is correct
55 Correct 102 ms 17048 KB Output is correct
56 Correct 107 ms 17232 KB Output is correct
57 Correct 118 ms 17304 KB Output is correct
58 Correct 113 ms 17232 KB Output is correct
59 Correct 117 ms 17236 KB Output is correct
60 Correct 140 ms 17744 KB Output is correct
61 Correct 101 ms 22100 KB Output is correct
62 Correct 110 ms 22220 KB Output is correct
63 Correct 102 ms 22096 KB Output is correct
64 Correct 104 ms 22100 KB Output is correct
65 Correct 121 ms 17148 KB Output is correct
66 Correct 112 ms 17232 KB Output is correct
67 Correct 106 ms 17232 KB Output is correct
68 Correct 78 ms 16976 KB Output is correct
69 Correct 76 ms 16976 KB Output is correct
70 Correct 107 ms 22476 KB Output is correct
71 Correct 109 ms 21844 KB Output is correct
72 Correct 0 ms 348 KB Output is correct
73 Correct 7 ms 2020 KB Output is correct
74 Correct 7 ms 2064 KB Output is correct
75 Correct 0 ms 348 KB Output is correct
76 Correct 0 ms 348 KB Output is correct
77 Correct 7 ms 2396 KB Output is correct
78 Correct 7 ms 2140 KB Output is correct
79 Correct 6 ms 1884 KB Output is correct
80 Correct 6 ms 2032 KB Output is correct
81 Correct 0 ms 348 KB Output is correct
82 Correct 0 ms 348 KB Output is correct
83 Correct 0 ms 348 KB Output is correct
84 Correct 0 ms 344 KB Output is correct
85 Correct 0 ms 348 KB Output is correct
86 Correct 29 ms 2324 KB Output is correct
87 Correct 30 ms 2416 KB Output is correct
88 Correct 30 ms 2400 KB Output is correct
89 Correct 8 ms 2544 KB Output is correct
90 Correct 8 ms 2136 KB Output is correct
91 Correct 30 ms 2396 KB Output is correct
92 Correct 32 ms 2392 KB Output is correct
93 Correct 1 ms 348 KB Output is correct
94 Correct 115 ms 27020 KB Output is correct
95 Correct 117 ms 26500 KB Output is correct
96 Correct 102 ms 25936 KB Output is correct
97 Correct 138 ms 26840 KB Output is correct
98 Correct 121 ms 27208 KB Output is correct
99 Correct 127 ms 17364 KB Output is correct
100 Correct 115 ms 17464 KB Output is correct
101 Correct 130 ms 17244 KB Output is correct
102 Correct 115 ms 17748 KB Output is correct
103 Correct 103 ms 21888 KB Output is correct
104 Correct 103 ms 22328 KB Output is correct
105 Correct 103 ms 21832 KB Output is correct
106 Correct 109 ms 22064 KB Output is correct
107 Correct 105 ms 21860 KB Output is correct
108 Correct 117 ms 26972 KB Output is correct
109 Correct 113 ms 27080 KB Output is correct
110 Correct 83 ms 17012 KB Output is correct
111 Correct 83 ms 16976 KB Output is correct
112 Correct 120 ms 17428 KB Output is correct
113 Correct 101 ms 17232 KB Output is correct