oj.uz

Submission #556111

# Submission time Handle Problem Language Result Execution time Memory
556111 2022-05-02T11:09:12 Z stefantaga Railway (BOI17_railway) C++14
100 / 100
 128 ms 24516 KB 
#include <bits/stdc++.h>
using namespace std;

int n, m, k;
vector<pair<int, int>> graph[100001];
int tin[100001], tout[100001], timer = 0, anc[100001][20], p_edge[100001];
int chosen[50001], bit[100001];

void dfs(int node = 1, int parent = 0) {
	tin[node] = ++timer;
	for (int i = 1; i < 20; i++) anc[node][i] = anc[anc[node][i - 1]][i - 1];
	for (pair<int, int> i : graph[node]) if (i.first != parent) {
		anc[i.first][0] = node;
		p_edge[i.first] = i.second;
		dfs(i.first, node);
	}
	tout[node] = timer;
}

bool is_ancestor(int a, int b) {
	return (tin[a] <= tin[b] && tout[a] >= tout[b]);
}

int lca(int a, int b) {
	if (is_ancestor(a, b)) return a;
	for (int i = 19; ~i; i--) {
		if (anc[a][i] && !is_ancestor(anc[a][i], b)) a = anc[a][i];
	}
	return anc[a][0];
}

void update(int pos, int val) {
	for (; pos <= n; pos += pos & (-pos)) bit[pos] += val;
}

int query(int a, int b) {
	int ans = 0;
	for (; b; b -= b & (-b)) ans += bit[b];
	for (a--; a; a -= a & (-a)) ans -= bit[a];
	return ans;
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> m >> k;
	for (int i = 1; i < n; i++) {
		int a, b;
		cin >> a >> b;
		graph[a].push_back({b, i});
		graph[b].push_back({a, i});
	}
	dfs();
	while (m--) {
		int s, l;
		cin >> s;
		for (int i = 0; i < s; i++) cin >> chosen[i];
		sort(chosen, chosen + s, [](int A, int B) { return tin[A] < tin[B]; });
		chosen[s] = chosen[0];
		for (int i = 0; i < s; i++) {
			int l = lca(chosen[i], chosen[i + 1]);
			update(tin[chosen[i]], 1);
			update(tin[chosen[i + 1]], 1);
			update(tin[l], -2);
		}
	}
	vector<int> ans;
	for (int i = 2; i <= n; i++)
		if (query(tin[i], tout[i]) >= 2 * k)
			ans.push_back(p_edge[i]);
	sort(ans.begin(), ans.end());
	cout << ans.size() << '\n';
	for (int i : ans) cout << i << ' ';
	return 0;
}

Compilation message

railway.cpp: In function 'int main()':
railway.cpp:55:10: warning: unused variable 'l' [-Wunused-variable]
   55 |   int s, l;
      |          ^

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 6 ms 3924 KB Output is correct
3 Correct 6 ms 4052 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 7 ms 4436 KB Output is correct
7 Correct 6 ms 4096 KB Output is correct
8 Correct 6 ms 4100 KB Output is correct
9 Correct 6 ms 4092 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2684 KB Output is correct
14 Correct 2 ms 2676 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 6 ms 3924 KB Output is correct
3 Correct 6 ms 4052 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 7 ms 4436 KB Output is correct
7 Correct 6 ms 4096 KB Output is correct
8 Correct 6 ms 4100 KB Output is correct
9 Correct 6 ms 4092 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2684 KB Output is correct
14 Correct 2 ms 2676 KB Output is correct
15 Correct 23 ms 4480 KB Output is correct
16 Correct 29 ms 4500 KB Output is correct
17 Correct 22 ms 4436 KB Output is correct
18 Correct 7 ms 4480 KB Output is correct
19 Correct 7 ms 4188 KB Output is correct
20 Correct 20 ms 4592 KB Output is correct
21 Correct 22 ms 4564 KB Output is correct
22 Correct 2 ms 2672 KB Output is correct
23 Correct 6 ms 4052 KB Output is correct
24 Correct 7 ms 4052 KB Output is correct
25 Correct 1 ms 2644 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 6 ms 4484 KB Output is correct
28 Correct 7 ms 4180 KB Output is correct
29 Correct 5 ms 4052 KB Output is correct
30 Correct 6 ms 4088 KB Output is correct
31 Correct 2 ms 2644 KB Output is correct
32 Correct 2 ms 2620 KB Output is correct
33 Correct 2 ms 2644 KB Output is correct
34 Correct 2 ms 2644 KB Output is correct
35 Correct 3 ms 2676 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 128 ms 22332 KB Output is correct
2 Correct 2 ms 2676 KB Output is correct
3 Correct 108 ms 23860 KB Output is correct
4 Correct 97 ms 23228 KB Output is correct
5 Correct 65 ms 24100 KB Output is correct
6 Correct 68 ms 24516 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 97 ms 18480 KB Output is correct
2 Correct 101 ms 15764 KB Output is correct
3 Correct 80 ms 15520 KB Output is correct
4 Correct 82 ms 15656 KB Output is correct
5 Correct 79 ms 15656 KB Output is correct
6 Correct 82 ms 18764 KB Output is correct
7 Correct 86 ms 18628 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 97 ms 18480 KB Output is correct
2 Correct 101 ms 15764 KB Output is correct
3 Correct 80 ms 15520 KB Output is correct
4 Correct 82 ms 15656 KB Output is correct
5 Correct 79 ms 15656 KB Output is correct
6 Correct 82 ms 18764 KB Output is correct
7 Correct 86 ms 18628 KB Output is correct
8 Correct 97 ms 18944 KB Output is correct
9 Correct 91 ms 20676 KB Output is correct
10 Correct 67 ms 24188 KB Output is correct
11 Correct 75 ms 24224 KB Output is correct
12 Correct 82 ms 17364 KB Output is correct
13 Correct 69 ms 17240 KB Output is correct
14 Correct 81 ms 17376 KB Output is correct
15 Correct 80 ms 17376 KB Output is correct
16 Correct 83 ms 17532 KB Output is correct
17 Correct 89 ms 17348 KB Output is correct
18 Correct 90 ms 17412 KB Output is correct
19 Correct 102 ms 17472 KB Output is correct
20 Correct 82 ms 20620 KB Output is correct
21 Correct 84 ms 20732 KB Output is correct
22 Correct 82 ms 20684 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2644 KB Output is correct
2 Correct 6 ms 3924 KB Output is correct
3 Correct 6 ms 4052 KB Output is correct
4 Correct 2 ms 2644 KB Output is correct
5 Correct 2 ms 2644 KB Output is correct
6 Correct 7 ms 4436 KB Output is correct
7 Correct 6 ms 4096 KB Output is correct
8 Correct 6 ms 4100 KB Output is correct
9 Correct 6 ms 4092 KB Output is correct
10 Correct 2 ms 2644 KB Output is correct
11 Correct 2 ms 2644 KB Output is correct
12 Correct 2 ms 2644 KB Output is correct
13 Correct 2 ms 2684 KB Output is correct
14 Correct 2 ms 2676 KB Output is correct
15 Correct 23 ms 4480 KB Output is correct
16 Correct 29 ms 4500 KB Output is correct
17 Correct 22 ms 4436 KB Output is correct
18 Correct 7 ms 4480 KB Output is correct
19 Correct 7 ms 4188 KB Output is correct
20 Correct 20 ms 4592 KB Output is correct
21 Correct 22 ms 4564 KB Output is correct
22 Correct 2 ms 2672 KB Output is correct
23 Correct 6 ms 4052 KB Output is correct
24 Correct 7 ms 4052 KB Output is correct
25 Correct 1 ms 2644 KB Output is correct
26 Correct 2 ms 2644 KB Output is correct
27 Correct 6 ms 4484 KB Output is correct
28 Correct 7 ms 4180 KB Output is correct
29 Correct 5 ms 4052 KB Output is correct
30 Correct 6 ms 4088 KB Output is correct
31 Correct 2 ms 2644 KB Output is correct
32 Correct 2 ms 2620 KB Output is correct
33 Correct 2 ms 2644 KB Output is correct
34 Correct 2 ms 2644 KB Output is correct
35 Correct 3 ms 2676 KB Output is correct
36 Correct 128 ms 22332 KB Output is correct
37 Correct 2 ms 2676 KB Output is correct
38 Correct 108 ms 23860 KB Output is correct
39 Correct 97 ms 23228 KB Output is correct
40 Correct 65 ms 24100 KB Output is correct
41 Correct 68 ms 24516 KB Output is correct
42 Correct 97 ms 18480 KB Output is correct
43 Correct 101 ms 15764 KB Output is correct
44 Correct 80 ms 15520 KB Output is correct
45 Correct 82 ms 15656 KB Output is correct
46 Correct 79 ms 15656 KB Output is correct
47 Correct 82 ms 18764 KB Output is correct
48 Correct 86 ms 18628 KB Output is correct
49 Correct 97 ms 18944 KB Output is correct
50 Correct 91 ms 20676 KB Output is correct
51 Correct 67 ms 24188 KB Output is correct
52 Correct 75 ms 24224 KB Output is correct
53 Correct 82 ms 17364 KB Output is correct
54 Correct 69 ms 17240 KB Output is correct
55 Correct 81 ms 17376 KB Output is correct
56 Correct 80 ms 17376 KB Output is correct
57 Correct 83 ms 17532 KB Output is correct
58 Correct 89 ms 17348 KB Output is correct
59 Correct 90 ms 17412 KB Output is correct
60 Correct 102 ms 17472 KB Output is correct
61 Correct 82 ms 20620 KB Output is correct
62 Correct 84 ms 20732 KB Output is correct
63 Correct 82 ms 20684 KB Output is correct
64 Correct 90 ms 20892 KB Output is correct
65 Correct 87 ms 17532 KB Output is correct
66 Correct 96 ms 17444 KB Output is correct
67 Correct 99 ms 17500 KB Output is correct
68 Correct 62 ms 17228 KB Output is correct
69 Correct 77 ms 17228 KB Output is correct
70 Correct 89 ms 21136 KB Output is correct
71 Correct 80 ms 20576 KB Output is correct
72 Correct 2 ms 2648 KB Output is correct
73 Correct 6 ms 4052 KB Output is correct
74 Correct 7 ms 4052 KB Output is correct
75 Correct 2 ms 2772 KB Output is correct
76 Correct 2 ms 2644 KB Output is correct
77 Correct 6 ms 4436 KB Output is correct
78 Correct 7 ms 4180 KB Output is correct
79 Correct 6 ms 4096 KB Output is correct
80 Correct 6 ms 4052 KB Output is correct
81 Correct 2 ms 2644 KB Output is correct
82 Correct 2 ms 2644 KB Output is correct
83 Correct 2 ms 2644 KB Output is correct
84 Correct 2 ms 2644 KB Output is correct
85 Correct 2 ms 2644 KB Output is correct
86 Correct 20 ms 4388 KB Output is correct
87 Correct 20 ms 4492 KB Output is correct
88 Correct 21 ms 4436 KB Output is correct
89 Correct 7 ms 4436 KB Output is correct
90 Correct 7 ms 4180 KB Output is correct
91 Correct 19 ms 4692 KB Output is correct
92 Correct 22 ms 4552 KB Output is correct
93 Correct 1 ms 2644 KB Output is correct
94 Correct 97 ms 24156 KB Output is correct
95 Correct 101 ms 23812 KB Output is correct
96 Correct 106 ms 23160 KB Output is correct
97 Correct 80 ms 24116 KB Output is correct
98 Correct 71 ms 24516 KB Output is correct
99 Correct 92 ms 17392 KB Output is correct
100 Correct 84 ms 17356 KB Output is correct
101 Correct 83 ms 17476 KB Output is correct
102 Correct 92 ms 17536 KB Output is correct
103 Correct 82 ms 20296 KB Output is correct
104 Correct 89 ms 20740 KB Output is correct
105 Correct 76 ms 20344 KB Output is correct
106 Correct 81 ms 20812 KB Output is correct
107 Correct 89 ms 20940 KB Output is correct
108 Correct 64 ms 24236 KB Output is correct
109 Correct 62 ms 24232 KB Output is correct
110 Correct 72 ms 17304 KB Output is correct
111 Correct 68 ms 17272 KB Output is correct
112 Correct 87 ms 17364 KB Output is correct
113 Correct 87 ms 17424 KB Output is correct