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Submission #1036768

# Submission time Handle Problem Language Result Execution time Memory
1036768 2024-07-27T16:39:44 Z sinatbtfard Railway (BOI17_railway) C++17
100 / 100
 90 ms 24524 KB 
#include <bits/stdc++.h>

#define pb push_back

using namespace std;

const int maxn = 1e5 + 1, maxLg = 20;

int n, q, k, timer, a[maxn], h[maxn], st[maxn], fn[maxn], par[maxn][maxLg];
vector <pair <int, int>> adj[maxn], check;
vector <int> res;

void dfs (int v, int p = 0){
	st[v] = timer++;
	par[v][0] = p;
	for (int i = 1; i < maxLg; i++)
		par[v][i] = par[par[v][i - 1]][i - 1];
	for (auto [u, ind] : adj[v]){
		if (u != p){
			h[u] = h[v] + 1;
			dfs(u, v);
		}
	}
	fn[v] = timer++;
}

int lca (int x, int y){
	if (h[x] < h[y])
		swap(x, y);
	if (st[x] <= st[y] && fn[x] >= fn[y])
		return x;
	for (int i = maxLg - 1; i >= 0; i--){
		if (par[x][i] == 0)
			continue;
		int u = par[x][i];
		if (!(st[u] <= st[y] && fn[u] >= fn[y]))
			x = u;
	}
	return par[x][0];
}

void dfs2 (int v, int ind, int p = 0){
	for (auto [u, i] : adj[v])
		if (u != p)
			dfs2(u, i, v);
	a[p] += a[v];
	if (a[v] >= 2 * k && ind > -1)
		res.pb(ind);
}

int main (){
	ios_base::sync_with_stdio(0);
	cin >> n >> q >> k;
	for (int x, y, i = 0; i < n - 1; i++)
		cin >> x >> y,
		adj[x].pb({y, i}),
		adj[y].pb({x, i});
	dfs(1);
	for (int s, i = 0; i < q; i++){
		cin >> s;
		for (int x, j = 0; j < s; j++)
			cin >> x,
			check.pb({st[x], x});
		sort(check.begin(), check.end());
		for (int j = 0; j < s; j++){
			auto [v, u] = make_pair(check[j].second, check[(j + 1) % s].second);
			a[v]++;
			a[u]++;
			a[lca(v, u)] -= 2;
		}
		check.clear();
	}
	dfs2(1, -1);
	sort(res.begin(), res.end());
	cout << res.size() << '\n';
	for (auto e : res)
		cout << e + 1 << " ";
}

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 4 ms 4188 KB Output is correct
3 Correct 4 ms 4136 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 5 ms 4444 KB Output is correct
7 Correct 6 ms 4188 KB Output is correct
8 Correct 4 ms 4108 KB Output is correct
9 Correct 4 ms 4188 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 1 ms 2652 KB Output is correct
12 Correct 1 ms 2592 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 1 ms 2652 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 4 ms 4188 KB Output is correct
3 Correct 4 ms 4136 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 5 ms 4444 KB Output is correct
7 Correct 6 ms 4188 KB Output is correct
8 Correct 4 ms 4108 KB Output is correct
9 Correct 4 ms 4188 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 1 ms 2652 KB Output is correct
12 Correct 1 ms 2592 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 1 ms 2652 KB Output is correct
15 Correct 14 ms 4444 KB Output is correct
16 Correct 13 ms 4516 KB Output is correct
17 Correct 14 ms 4604 KB Output is correct
18 Correct 5 ms 4444 KB Output is correct
19 Correct 5 ms 4204 KB Output is correct
20 Correct 11 ms 4688 KB Output is correct
21 Correct 13 ms 4700 KB Output is correct
22 Correct 1 ms 2648 KB Output is correct
23 Correct 4 ms 4188 KB Output is correct
24 Correct 4 ms 4120 KB Output is correct
25 Correct 1 ms 2652 KB Output is correct
26 Correct 1 ms 2652 KB Output is correct
27 Correct 5 ms 4444 KB Output is correct
28 Correct 4 ms 4188 KB Output is correct
29 Correct 3 ms 4188 KB Output is correct
30 Correct 4 ms 4188 KB Output is correct
31 Correct 1 ms 2652 KB Output is correct
32 Correct 1 ms 2816 KB Output is correct
33 Correct 1 ms 2908 KB Output is correct
34 Correct 1 ms 2652 KB Output is correct
35 Correct 1 ms 2652 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 76 ms 24232 KB Output is correct
2 Correct 1 ms 2648 KB Output is correct
3 Correct 68 ms 23760 KB Output is correct
4 Correct 65 ms 23360 KB Output is correct
5 Correct 77 ms 24184 KB Output is correct
6 Correct 68 ms 24444 KB Output is correct

Subtask #4
29.0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 48 ms 20656 KB Output is correct
2 Correct 52 ms 17900 KB Output is correct
3 Correct 48 ms 17564 KB Output is correct
4 Correct 46 ms 17712 KB Output is correct
5 Correct 52 ms 17488 KB Output is correct
6 Correct 53 ms 20820 KB Output is correct
7 Correct 52 ms 20564 KB Output is correct

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 48 ms 20656 KB Output is correct
2 Correct 52 ms 17900 KB Output is correct
3 Correct 48 ms 17564 KB Output is correct
4 Correct 46 ms 17712 KB Output is correct
5 Correct 52 ms 17488 KB Output is correct
6 Correct 53 ms 20820 KB Output is correct
7 Correct 52 ms 20564 KB Output is correct
8 Correct 54 ms 20820 KB Output is correct
9 Correct 60 ms 20852 KB Output is correct
10 Correct 71 ms 24184 KB Output is correct
11 Correct 65 ms 24268 KB Output is correct
12 Correct 39 ms 17416 KB Output is correct
13 Correct 46 ms 17488 KB Output is correct
14 Correct 45 ms 17492 KB Output is correct
15 Correct 48 ms 17488 KB Output is correct
16 Correct 46 ms 17488 KB Output is correct
17 Correct 44 ms 17488 KB Output is correct
18 Correct 46 ms 17492 KB Output is correct
19 Correct 53 ms 18004 KB Output is correct
20 Correct 50 ms 21076 KB Output is correct
21 Correct 53 ms 21020 KB Output is correct
22 Correct 54 ms 21072 KB Output is correct

Subtask #6
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2648 KB Output is correct
2 Correct 4 ms 4188 KB Output is correct
3 Correct 4 ms 4136 KB Output is correct
4 Correct 1 ms 2652 KB Output is correct
5 Correct 1 ms 2652 KB Output is correct
6 Correct 5 ms 4444 KB Output is correct
7 Correct 6 ms 4188 KB Output is correct
8 Correct 4 ms 4108 KB Output is correct
9 Correct 4 ms 4188 KB Output is correct
10 Correct 1 ms 2652 KB Output is correct
11 Correct 1 ms 2652 KB Output is correct
12 Correct 1 ms 2592 KB Output is correct
13 Correct 1 ms 2652 KB Output is correct
14 Correct 1 ms 2652 KB Output is correct
15 Correct 14 ms 4444 KB Output is correct
16 Correct 13 ms 4516 KB Output is correct
17 Correct 14 ms 4604 KB Output is correct
18 Correct 5 ms 4444 KB Output is correct
19 Correct 5 ms 4204 KB Output is correct
20 Correct 11 ms 4688 KB Output is correct
21 Correct 13 ms 4700 KB Output is correct
22 Correct 1 ms 2648 KB Output is correct
23 Correct 4 ms 4188 KB Output is correct
24 Correct 4 ms 4120 KB Output is correct
25 Correct 1 ms 2652 KB Output is correct
26 Correct 1 ms 2652 KB Output is correct
27 Correct 5 ms 4444 KB Output is correct
28 Correct 4 ms 4188 KB Output is correct
29 Correct 3 ms 4188 KB Output is correct
30 Correct 4 ms 4188 KB Output is correct
31 Correct 1 ms 2652 KB Output is correct
32 Correct 1 ms 2816 KB Output is correct
33 Correct 1 ms 2908 KB Output is correct
34 Correct 1 ms 2652 KB Output is correct
35 Correct 1 ms 2652 KB Output is correct
36 Correct 76 ms 24232 KB Output is correct
37 Correct 1 ms 2648 KB Output is correct
38 Correct 68 ms 23760 KB Output is correct
39 Correct 65 ms 23360 KB Output is correct
40 Correct 77 ms 24184 KB Output is correct
41 Correct 68 ms 24444 KB Output is correct
42 Correct 48 ms 20656 KB Output is correct
43 Correct 52 ms 17900 KB Output is correct
44 Correct 48 ms 17564 KB Output is correct
45 Correct 46 ms 17712 KB Output is correct
46 Correct 52 ms 17488 KB Output is correct
47 Correct 53 ms 20820 KB Output is correct
48 Correct 52 ms 20564 KB Output is correct
49 Correct 54 ms 20820 KB Output is correct
50 Correct 60 ms 20852 KB Output is correct
51 Correct 71 ms 24184 KB Output is correct
52 Correct 65 ms 24268 KB Output is correct
53 Correct 39 ms 17416 KB Output is correct
54 Correct 46 ms 17488 KB Output is correct
55 Correct 45 ms 17492 KB Output is correct
56 Correct 48 ms 17488 KB Output is correct
57 Correct 46 ms 17488 KB Output is correct
58 Correct 44 ms 17488 KB Output is correct
59 Correct 46 ms 17492 KB Output is correct
60 Correct 53 ms 18004 KB Output is correct
61 Correct 50 ms 21076 KB Output is correct
62 Correct 53 ms 21020 KB Output is correct
63 Correct 54 ms 21072 KB Output is correct
64 Correct 57 ms 20816 KB Output is correct
65 Correct 47 ms 17488 KB Output is correct
66 Correct 50 ms 17524 KB Output is correct
67 Correct 52 ms 17752 KB Output is correct
68 Correct 41 ms 17172 KB Output is correct
69 Correct 34 ms 17240 KB Output is correct
70 Correct 54 ms 21328 KB Output is correct
71 Correct 55 ms 20564 KB Output is correct
72 Correct 1 ms 2648 KB Output is correct
73 Correct 4 ms 4188 KB Output is correct
74 Correct 4 ms 4188 KB Output is correct
75 Correct 1 ms 2652 KB Output is correct
76 Correct 2 ms 2652 KB Output is correct
77 Correct 4 ms 4524 KB Output is correct
78 Correct 4 ms 4188 KB Output is correct
79 Correct 4 ms 4188 KB Output is correct
80 Correct 4 ms 4188 KB Output is correct
81 Correct 1 ms 2652 KB Output is correct
82 Correct 1 ms 2652 KB Output is correct
83 Correct 1 ms 2652 KB Output is correct
84 Correct 1 ms 2652 KB Output is correct
85 Correct 1 ms 2648 KB Output is correct
86 Correct 13 ms 4612 KB Output is correct
87 Correct 13 ms 4444 KB Output is correct
88 Correct 14 ms 4700 KB Output is correct
89 Correct 5 ms 4444 KB Output is correct
90 Correct 5 ms 4164 KB Output is correct
91 Correct 12 ms 4808 KB Output is correct
92 Correct 16 ms 4696 KB Output is correct
93 Correct 1 ms 2652 KB Output is correct
94 Correct 90 ms 24148 KB Output is correct
95 Correct 67 ms 23760 KB Output is correct
96 Correct 65 ms 23216 KB Output is correct
97 Correct 75 ms 24264 KB Output is correct
98 Correct 81 ms 24524 KB Output is correct
99 Correct 46 ms 17500 KB Output is correct
100 Correct 46 ms 17716 KB Output is correct
101 Correct 53 ms 17500 KB Output is correct
102 Correct 46 ms 17996 KB Output is correct
103 Correct 51 ms 20816 KB Output is correct
104 Correct 49 ms 21076 KB Output is correct
105 Correct 49 ms 20692 KB Output is correct
106 Correct 63 ms 20816 KB Output is correct
107 Correct 53 ms 20820 KB Output is correct
108 Correct 66 ms 24316 KB Output is correct
109 Correct 68 ms 24268 KB Output is correct
110 Correct 39 ms 17496 KB Output is correct
111 Correct 36 ms 17288 KB Output is correct
112 Correct 44 ms 17448 KB Output is correct
113 Correct 45 ms 17492 KB Output is correct