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Submission #478073

# Submission time Handle Problem Language Result Execution time Memory
478073 2021-10-05T13:54:18 Z Sohsoh84 Railway (BOI17_railway) C++17
100 / 100
 105 ms 26468 KB 
// ?
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int, int> pll;

#define all(x)			(x).begin(),(x).end()
#define X			first
#define Y			second
#define sep			' '
#define endl			'\n'
#define debug(x)		cerr << #x << ": " <<  x << endl;

const ll MAXN = 1e5 + 10;
const ll LOG = 20;

int ans[MAXN], n, m, k, par[MAXN][LOG], delta[MAXN], F[MAXN], H[MAXN], tout[MAXN], T; // tin
vector<pll> adj[MAXN];

void dfs(int v, int p) {
	H[v] = H[p] + 1;
	par[v][0] = p;
	for (pll e : adj[v])
		if (e.X != p)
			dfs(e.X, v);
	tout[v] = T++;
}

inline int Par(int v, int k) {
	for (int i = LOG - 1; i >= 0; i--)
		if (k & (1 << i))
			v = par[v][i];
	return v;
}

inline int LCA(int v, int u) {
	if (H[v] < H[u]) swap(v, u);
	v = Par(v, H[v] - H[u]);
	if (v == u) return v;

	for (int i = LOG - 1; i >= 0; i--)
		if (par[v][i] != par[u][i])
			v = par[v][i], u = par[u][i];
	return par[v][0];
}

void dfs2(int v, int p, int ind) {
	F[v] += delta[v];
	for (pll e : adj[v]) {
		if (e.X != p) {
			dfs2(e.X, v, e.Y);
			F[v] += F[e.X];
		}
	}

	ans[ind] = F[v] / 2;
}

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	cin >> n >> m >> k;
	for (int i = 1; i < n; i++) {
		int v, u;
		cin >> v >> u;
		adj[u].push_back({v, i});
		adj[v].push_back({u, i});
	}


	dfs(1, 0);
	for (int i = 1; i < LOG; i++)
		for (int v = 1; v <= n; v++)
			par[v][i] = par[par[v][i - 1]][i - 1];

	for (int i = 1; i <= m; i++) {
		int s;
		cin >> s;
		vector<int> vec;
		for (int i = 1; i <= s; i++) {
			int v;
			cin >> v;
			vec.push_back(v);
		}

		sort(all(vec), [] (int v, int u) {
			return tout[v] < tout[u];		
		});

		for (int i = 0; i < s; i++) {
			int v = vec[i], u = vec[(i + 1) % s], lca = LCA(u, v);
			delta[v]++;
			delta[u]++;
			delta[lca] -= 2;
		}
	}

	dfs2(1, 0, 0);
	vector<int> vec;
	for (int i = 1; i < n; i++)
		if (ans[i] >= k)
			vec.push_back(i);

	cout << vec.size() << endl;
	for (int e : vec) cout << e << sep;
	cout << endl;
	return 0;
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2640 KB Output is correct
2 Correct 7 ms 4048 KB Output is correct
3 Correct 6 ms 4048 KB Output is correct
4 Correct 2 ms 2640 KB Output is correct
5 Correct 2 ms 2640 KB Output is correct
6 Correct 7 ms 4616 KB Output is correct
7 Correct 6 ms 4176 KB Output is correct
8 Correct 6 ms 4096 KB Output is correct
9 Correct 6 ms 4176 KB Output is correct
10 Correct 2 ms 2676 KB Output is correct
11 Correct 2 ms 2640 KB Output is correct
12 Correct 2 ms 2640 KB Output is correct
13 Correct 2 ms 2640 KB Output is correct
14 Correct 2 ms 2696 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2640 KB Output is correct
2 Correct 7 ms 4048 KB Output is correct
3 Correct 6 ms 4048 KB Output is correct
4 Correct 2 ms 2640 KB Output is correct
5 Correct 2 ms 2640 KB Output is correct
6 Correct 7 ms 4616 KB Output is correct
7 Correct 6 ms 4176 KB Output is correct
8 Correct 6 ms 4096 KB Output is correct
9 Correct 6 ms 4176 KB Output is correct
10 Correct 2 ms 2676 KB Output is correct
11 Correct 2 ms 2640 KB Output is correct
12 Correct 2 ms 2640 KB Output is correct
13 Correct 2 ms 2640 KB Output is correct
14 Correct 2 ms 2696 KB Output is correct
15 Correct 22 ms 4424 KB Output is correct
16 Correct 25 ms 4460 KB Output is correct
17 Correct 25 ms 4580 KB Output is correct
18 Correct 7 ms 4560 KB Output is correct
19 Correct 6 ms 4176 KB Output is correct
20 Correct 21 ms 4680 KB Output is correct
21 Correct 28 ms 4616 KB Output is correct
22 Correct 2 ms 2640 KB Output is correct
23 Correct 7 ms 4060 KB Output is correct
24 Correct 6 ms 4048 KB Output is correct
25 Correct 2 ms 2640 KB Output is correct
26 Correct 2 ms 2640 KB Output is correct
27 Correct 8 ms 4560 KB Output is correct
28 Correct 8 ms 4228 KB Output is correct
29 Correct 5 ms 4048 KB Output is correct
30 Correct 6 ms 4176 KB Output is correct
31 Correct 2 ms 2640 KB Output is correct
32 Correct 2 ms 2640 KB Output is correct
33 Correct 2 ms 2676 KB Output is correct
34 Correct 2 ms 2640 KB Output is correct
35 Correct 1 ms 2640 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 101 ms 26216 KB Output is correct
2 Correct 2 ms 2640 KB Output is correct
3 Correct 94 ms 25796 KB Output is correct
4 Correct 99 ms 25208 KB Output is correct
5 Correct 105 ms 26104 KB Output is correct
6 Correct 91 ms 26428 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 86 ms 21644 KB Output is correct
2 Correct 90 ms 18344 KB Output is correct
3 Correct 101 ms 17948 KB Output is correct
4 Correct 96 ms 17920 KB Output is correct
5 Correct 96 ms 17948 KB Output is correct
6 Correct 78 ms 21832 KB Output is correct
7 Correct 77 ms 21564 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 86 ms 21644 KB Output is correct
2 Correct 90 ms 18344 KB Output is correct
3 Correct 101 ms 17948 KB Output is correct
4 Correct 96 ms 17920 KB Output is correct
5 Correct 96 ms 17948 KB Output is correct
6 Correct 78 ms 21832 KB Output is correct
7 Correct 77 ms 21564 KB Output is correct
8 Correct 82 ms 21832 KB Output is correct
9 Correct 88 ms 21832 KB Output is correct
10 Correct 99 ms 26112 KB Output is correct
11 Correct 88 ms 26048 KB Output is correct
12 Correct 76 ms 17636 KB Output is correct
13 Correct 67 ms 17736 KB Output is correct
14 Correct 98 ms 17816 KB Output is correct
15 Correct 91 ms 17800 KB Output is correct
16 Correct 102 ms 18076 KB Output is correct
17 Correct 99 ms 17864 KB Output is correct
18 Correct 96 ms 17920 KB Output is correct
19 Correct 86 ms 18248 KB Output is correct
20 Correct 81 ms 21896 KB Output is correct
21 Correct 85 ms 21984 KB Output is correct
22 Correct 80 ms 21904 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2640 KB Output is correct
2 Correct 7 ms 4048 KB Output is correct
3 Correct 6 ms 4048 KB Output is correct
4 Correct 2 ms 2640 KB Output is correct
5 Correct 2 ms 2640 KB Output is correct
6 Correct 7 ms 4616 KB Output is correct
7 Correct 6 ms 4176 KB Output is correct
8 Correct 6 ms 4096 KB Output is correct
9 Correct 6 ms 4176 KB Output is correct
10 Correct 2 ms 2676 KB Output is correct
11 Correct 2 ms 2640 KB Output is correct
12 Correct 2 ms 2640 KB Output is correct
13 Correct 2 ms 2640 KB Output is correct
14 Correct 2 ms 2696 KB Output is correct
15 Correct 22 ms 4424 KB Output is correct
16 Correct 25 ms 4460 KB Output is correct
17 Correct 25 ms 4580 KB Output is correct
18 Correct 7 ms 4560 KB Output is correct
19 Correct 6 ms 4176 KB Output is correct
20 Correct 21 ms 4680 KB Output is correct
21 Correct 28 ms 4616 KB Output is correct
22 Correct 2 ms 2640 KB Output is correct
23 Correct 7 ms 4060 KB Output is correct
24 Correct 6 ms 4048 KB Output is correct
25 Correct 2 ms 2640 KB Output is correct
26 Correct 2 ms 2640 KB Output is correct
27 Correct 8 ms 4560 KB Output is correct
28 Correct 8 ms 4228 KB Output is correct
29 Correct 5 ms 4048 KB Output is correct
30 Correct 6 ms 4176 KB Output is correct
31 Correct 2 ms 2640 KB Output is correct
32 Correct 2 ms 2640 KB Output is correct
33 Correct 2 ms 2676 KB Output is correct
34 Correct 2 ms 2640 KB Output is correct
35 Correct 1 ms 2640 KB Output is correct
36 Correct 101 ms 26216 KB Output is correct
37 Correct 2 ms 2640 KB Output is correct
38 Correct 94 ms 25796 KB Output is correct
39 Correct 99 ms 25208 KB Output is correct
40 Correct 105 ms 26104 KB Output is correct
41 Correct 91 ms 26428 KB Output is correct
42 Correct 86 ms 21644 KB Output is correct
43 Correct 90 ms 18344 KB Output is correct
44 Correct 101 ms 17948 KB Output is correct
45 Correct 96 ms 17920 KB Output is correct
46 Correct 96 ms 17948 KB Output is correct
47 Correct 78 ms 21832 KB Output is correct
48 Correct 77 ms 21564 KB Output is correct
49 Correct 82 ms 21832 KB Output is correct
50 Correct 88 ms 21832 KB Output is correct
51 Correct 99 ms 26112 KB Output is correct
52 Correct 88 ms 26048 KB Output is correct
53 Correct 76 ms 17636 KB Output is correct
54 Correct 67 ms 17736 KB Output is correct
55 Correct 98 ms 17816 KB Output is correct
56 Correct 91 ms 17800 KB Output is correct
57 Correct 102 ms 18076 KB Output is correct
58 Correct 99 ms 17864 KB Output is correct
59 Correct 96 ms 17920 KB Output is correct
60 Correct 86 ms 18248 KB Output is correct
61 Correct 81 ms 21896 KB Output is correct
62 Correct 85 ms 21984 KB Output is correct
63 Correct 80 ms 21904 KB Output is correct
64 Correct 87 ms 22084 KB Output is correct
65 Correct 95 ms 17864 KB Output is correct
66 Correct 101 ms 17808 KB Output is correct
67 Correct 98 ms 17812 KB Output is correct
68 Correct 67 ms 17564 KB Output is correct
69 Correct 59 ms 17608 KB Output is correct
70 Correct 98 ms 22352 KB Output is correct
71 Correct 86 ms 21684 KB Output is correct
72 Correct 2 ms 2640 KB Output is correct
73 Correct 6 ms 4048 KB Output is correct
74 Correct 8 ms 4048 KB Output is correct
75 Correct 2 ms 2640 KB Output is correct
76 Correct 2 ms 2676 KB Output is correct
77 Correct 7 ms 4560 KB Output is correct
78 Correct 6 ms 4176 KB Output is correct
79 Correct 5 ms 4048 KB Output is correct
80 Correct 5 ms 4152 KB Output is correct
81 Correct 2 ms 2640 KB Output is correct
82 Correct 2 ms 2640 KB Output is correct
83 Correct 2 ms 2640 KB Output is correct
84 Correct 2 ms 2640 KB Output is correct
85 Correct 2 ms 2640 KB Output is correct
86 Correct 21 ms 4484 KB Output is correct
87 Correct 25 ms 4424 KB Output is correct
88 Correct 22 ms 4552 KB Output is correct
89 Correct 7 ms 4516 KB Output is correct
90 Correct 7 ms 4176 KB Output is correct
91 Correct 21 ms 4636 KB Output is correct
92 Correct 30 ms 4620 KB Output is correct
93 Correct 3 ms 2640 KB Output is correct
94 Correct 96 ms 26016 KB Output is correct
95 Correct 100 ms 25732 KB Output is correct
96 Correct 89 ms 25116 KB Output is correct
97 Correct 104 ms 26104 KB Output is correct
98 Correct 96 ms 26468 KB Output is correct
99 Correct 90 ms 17864 KB Output is correct
100 Correct 100 ms 18060 KB Output is correct
101 Correct 97 ms 17872 KB Output is correct
102 Correct 84 ms 18244 KB Output is correct
103 Correct 81 ms 21684 KB Output is correct
104 Correct 82 ms 21944 KB Output is correct
105 Correct 79 ms 21576 KB Output is correct
106 Correct 90 ms 21992 KB Output is correct
107 Correct 88 ms 21820 KB Output is correct
108 Correct 96 ms 26176 KB Output is correct
109 Correct 95 ms 26216 KB Output is correct
110 Correct 77 ms 17644 KB Output is correct
111 Correct 79 ms 17740 KB Output is correct
112 Correct 89 ms 17816 KB Output is correct
113 Correct 99 ms 17788 KB Output is correct