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Submission #936730

# Submission time Handle Problem Language Result Execution time Memory
936730 2024-03-02T15:58:48 Z XXBabaProBerkay Railway (BOI17_railway) C++11
100 / 100
 81 ms 27404 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 344 KB Output is correct
2 Correct 4 ms 1884 KB Output is correct
3 Correct 4 ms 1884 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 4 ms 2396 KB Output is correct
7 Correct 4 ms 2128 KB Output is correct
8 Correct 3 ms 1884 KB Output is correct
9 Correct 4 ms 1884 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 456 KB Output is correct
12 Correct 0 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 344 KB Output is correct
2 Correct 4 ms 1884 KB Output is correct
3 Correct 4 ms 1884 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 4 ms 2396 KB Output is correct
7 Correct 4 ms 2128 KB Output is correct
8 Correct 3 ms 1884 KB Output is correct
9 Correct 4 ms 1884 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 456 KB Output is correct
12 Correct 0 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 18 ms 2396 KB Output is correct
16 Correct 17 ms 2396 KB Output is correct
17 Correct 18 ms 2396 KB Output is correct
18 Correct 5 ms 2396 KB Output is correct
19 Correct 4 ms 2140 KB Output is correct
20 Correct 16 ms 2512 KB Output is correct
21 Correct 18 ms 2396 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 4 ms 1884 KB Output is correct
24 Correct 4 ms 1884 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 4 ms 2396 KB Output is correct
28 Correct 4 ms 2140 KB Output is correct
29 Correct 3 ms 1884 KB Output is correct
30 Correct 4 ms 1884 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 0 ms 344 KB Output is correct
34 Correct 0 ms 344 KB Output is correct
35 Correct 0 ms 348 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 63 ms 26824 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 60 ms 26576 KB Output is correct
4 Correct 59 ms 25936 KB Output is correct
5 Correct 65 ms 26824 KB Output is correct
6 Correct 75 ms 27340 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 54 ms 21900 KB Output is correct
2 Correct 55 ms 17748 KB Output is correct
3 Correct 61 ms 17328 KB Output is correct
4 Correct 58 ms 17340 KB Output is correct
5 Correct 64 ms 17332 KB Output is correct
6 Correct 55 ms 22096 KB Output is correct
7 Correct 53 ms 21840 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 54 ms 21900 KB Output is correct
2 Correct 55 ms 17748 KB Output is correct
3 Correct 61 ms 17328 KB Output is correct
4 Correct 58 ms 17340 KB Output is correct
5 Correct 64 ms 17332 KB Output is correct
6 Correct 55 ms 22096 KB Output is correct
7 Correct 53 ms 21840 KB Output is correct
8 Correct 61 ms 21840 KB Output is correct
9 Correct 60 ms 22096 KB Output is correct
10 Correct 66 ms 27084 KB Output is correct
11 Correct 70 ms 27080 KB Output is correct
12 Correct 48 ms 16976 KB Output is correct
13 Correct 49 ms 16980 KB Output is correct
14 Correct 59 ms 17236 KB Output is correct
15 Correct 60 ms 17236 KB Output is correct
16 Correct 63 ms 17328 KB Output is correct
17 Correct 64 ms 17232 KB Output is correct
18 Correct 61 ms 17120 KB Output is correct
19 Correct 64 ms 17744 KB Output is correct
20 Correct 56 ms 22100 KB Output is correct
21 Correct 55 ms 22348 KB Output is correct
22 Correct 56 ms 22232 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 4 ms 1884 KB Output is correct
3 Correct 4 ms 1884 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 4 ms 2396 KB Output is correct
7 Correct 4 ms 2128 KB Output is correct
8 Correct 3 ms 1884 KB Output is correct
9 Correct 4 ms 1884 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 456 KB Output is correct
12 Correct 0 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 18 ms 2396 KB Output is correct
16 Correct 17 ms 2396 KB Output is correct
17 Correct 18 ms 2396 KB Output is correct
18 Correct 5 ms 2396 KB Output is correct
19 Correct 4 ms 2140 KB Output is correct
20 Correct 16 ms 2512 KB Output is correct
21 Correct 18 ms 2396 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 4 ms 1884 KB Output is correct
24 Correct 4 ms 1884 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 4 ms 2396 KB Output is correct
28 Correct 4 ms 2140 KB Output is correct
29 Correct 3 ms 1884 KB Output is correct
30 Correct 4 ms 1884 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 0 ms 348 KB Output is correct
33 Correct 0 ms 344 KB Output is correct
34 Correct 0 ms 344 KB Output is correct
35 Correct 0 ms 348 KB Output is correct
36 Correct 63 ms 26824 KB Output is correct
37 Correct 0 ms 348 KB Output is correct
38 Correct 60 ms 26576 KB Output is correct
39 Correct 59 ms 25936 KB Output is correct
40 Correct 65 ms 26824 KB Output is correct
41 Correct 75 ms 27340 KB Output is correct
42 Correct 54 ms 21900 KB Output is correct
43 Correct 55 ms 17748 KB Output is correct
44 Correct 61 ms 17328 KB Output is correct
45 Correct 58 ms 17340 KB Output is correct
46 Correct 64 ms 17332 KB Output is correct
47 Correct 55 ms 22096 KB Output is correct
48 Correct 53 ms 21840 KB Output is correct
49 Correct 61 ms 21840 KB Output is correct
50 Correct 60 ms 22096 KB Output is correct
51 Correct 66 ms 27084 KB Output is correct
52 Correct 70 ms 27080 KB Output is correct
53 Correct 48 ms 16976 KB Output is correct
54 Correct 49 ms 16980 KB Output is correct
55 Correct 59 ms 17236 KB Output is correct
56 Correct 60 ms 17236 KB Output is correct
57 Correct 63 ms 17328 KB Output is correct
58 Correct 64 ms 17232 KB Output is correct
59 Correct 61 ms 17120 KB Output is correct
60 Correct 64 ms 17744 KB Output is correct
61 Correct 56 ms 22100 KB Output is correct
62 Correct 55 ms 22348 KB Output is correct
63 Correct 56 ms 22232 KB Output is correct
64 Correct 59 ms 22148 KB Output is correct
65 Correct 68 ms 17148 KB Output is correct
66 Correct 73 ms 17232 KB Output is correct
67 Correct 64 ms 17264 KB Output is correct
68 Correct 45 ms 16980 KB Output is correct
69 Correct 52 ms 17008 KB Output is correct
70 Correct 59 ms 22364 KB Output is correct
71 Correct 61 ms 21844 KB Output is correct
72 Correct 1 ms 348 KB Output is correct
73 Correct 6 ms 2084 KB Output is correct
74 Correct 4 ms 1884 KB Output is correct
75 Correct 1 ms 360 KB Output is correct
76 Correct 0 ms 344 KB Output is correct
77 Correct 6 ms 2396 KB Output is correct
78 Correct 4 ms 2140 KB Output is correct
79 Correct 3 ms 1884 KB Output is correct
80 Correct 4 ms 1884 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 348 KB Output is correct
85 Correct 0 ms 348 KB Output is correct
86 Correct 19 ms 2396 KB Output is correct
87 Correct 19 ms 2396 KB Output is correct
88 Correct 18 ms 2348 KB Output is correct
89 Correct 5 ms 2392 KB Output is correct
90 Correct 4 ms 2140 KB Output is correct
91 Correct 16 ms 2564 KB Output is correct
92 Correct 18 ms 2396 KB Output is correct
93 Correct 0 ms 348 KB Output is correct
94 Correct 64 ms 26824 KB Output is correct
95 Correct 60 ms 26656 KB Output is correct
96 Correct 57 ms 25936 KB Output is correct
97 Correct 72 ms 26828 KB Output is correct
98 Correct 78 ms 27404 KB Output is correct
99 Correct 56 ms 17232 KB Output is correct
100 Correct 62 ms 17320 KB Output is correct
101 Correct 59 ms 17268 KB Output is correct
102 Correct 81 ms 17808 KB Output is correct
103 Correct 54 ms 21840 KB Output is correct
104 Correct 56 ms 22220 KB Output is correct
105 Correct 54 ms 21840 KB Output is correct
106 Correct 61 ms 22096 KB Output is correct
107 Correct 80 ms 21984 KB Output is correct
108 Correct 66 ms 27080 KB Output is correct
109 Correct 68 ms 27084 KB Output is correct
110 Correct 50 ms 17112 KB Output is correct
111 Correct 46 ms 16980 KB Output is correct
112 Correct 58 ms 17236 KB Output is correct
113 Correct 58 ms 17196 KB Output is correct