#include <bits/stdc++.h>
using namespace std;
#define file ""
#define mp make_pair
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define getbit(x, i) (((x) >> (i)) & 1)
#define bit(x) (1LL << (x))
#define popcount __builtin_popcountll
mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count());
int rand(int l, int r) {
return l + rd() % (r - l + 1);
}
const int N = 1e5 + 5;
const int mod = (int)1e9 + 7; // 998244353;
const int lg = 25; // lg + 1
const int oo = 1e9;
const long long ooo = 1e18;
template<class X, class Y> bool mini(X &a, Y b) {
return a > b ? (a = b, true) : false;
}
template<class X, class Y> bool maxi(X &a, Y b) {
return a < b ? (a = b, true) : false;
}
void add(int &a, int b) {
a += b;
if (a >= mod) a -= mod;
if (a < 0) a += mod;
}
int n, q, k;
vector<pair<int, int> > adj[N];
int fin[N];
int h[N], par[N][lg + 1];
int par_id[N];
int d[N];
vector<int> ans;
int timer = 0;
void dfs(int u, int p) {
fin[u] = ++timer;
par[u][0] = p;
for (int i = 1; i <= lg; ++i) par[u][i] = par[par[u][i - 1]][i - 1];
for (auto [v, id] : adj[u]) if (v != p) {
h[v] = h[u] + 1;
par_id[v] = id;
dfs(v, u);
}
}
int lca(int u, int v) {
if (h[u] < h[v]) swap(u, v);
for (int i = lg; i >= 0; --i) if (h[par[u][i]] >= h[v]) u = par[u][i];
if (u == v) return u;
for (int i = lg; i >= 0; --i) if (par[u][i] != par[v][i]) {
u = par[u][i];
v = par[v][i];
}
return par[u][0];
}
void dfs_dis(int u, int p) {
for (auto [v, id] : adj[u]) if (v != p) {
dfs_dis(v, u);
d[u] += d[v];
if (d[v] >= 2 * k) ans.push_back(par_id[v]);
}
}
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
// freopen(file".inp", "r", stdin);
// freopen(file".out", "w", stdout);
cin >> n >> q >> k;
for (int i = 1; i < n; ++i) {
int u, v;
cin >> u >> v;
adj[u].emplace_back(v, i);
adj[v].emplace_back(u, i);
}
h[0] = -1;
dfs(1, 0);
while (q--) {
vector<int> node;
int num;
cin >> num;
for (int i = 0; i < num; ++i) {
int x;
cin >> x;
node.push_back(x);
}
if (num == 1) continue;
sort(all(node), [&] (int x, int y) {
return fin[x] < fin[y];
});
node.push_back(node.front());
for (int i = 0; i < num; ++i) {
d[node[i]]++;
d[node[i + 1]]++;
d[lca(node[i], node[i + 1])] -= 2;
}
}
dfs_dis(1, 0);
sort(all(ans));
cout << (int) ans.size() << '\n';
for (int i : ans) cout << i << ' ';
return 0;
}
/*
6 3 2
1 3
2 3
3 4
6 4
4 5
4 1 3 2 5
2 6 3
2 3 2
2
2 3
*/
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
5976 KB |
Output is correct |
2 |
Correct |
5 ms |
6688 KB |
Output is correct |
3 |
Correct |
5 ms |
6492 KB |
Output is correct |
4 |
Correct |
2 ms |
5980 KB |
Output is correct |
5 |
Correct |
1 ms |
6164 KB |
Output is correct |
6 |
Correct |
6 ms |
7004 KB |
Output is correct |
7 |
Correct |
6 ms |
6680 KB |
Output is correct |
8 |
Correct |
5 ms |
6688 KB |
Output is correct |
9 |
Correct |
5 ms |
6492 KB |
Output is correct |
10 |
Correct |
2 ms |
5980 KB |
Output is correct |
11 |
Correct |
1 ms |
5980 KB |
Output is correct |
12 |
Correct |
2 ms |
5980 KB |
Output is correct |
13 |
Correct |
2 ms |
5980 KB |
Output is correct |
14 |
Correct |
1 ms |
5980 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
5976 KB |
Output is correct |
2 |
Correct |
5 ms |
6688 KB |
Output is correct |
3 |
Correct |
5 ms |
6492 KB |
Output is correct |
4 |
Correct |
2 ms |
5980 KB |
Output is correct |
5 |
Correct |
1 ms |
6164 KB |
Output is correct |
6 |
Correct |
6 ms |
7004 KB |
Output is correct |
7 |
Correct |
6 ms |
6680 KB |
Output is correct |
8 |
Correct |
5 ms |
6688 KB |
Output is correct |
9 |
Correct |
5 ms |
6492 KB |
Output is correct |
10 |
Correct |
2 ms |
5980 KB |
Output is correct |
11 |
Correct |
1 ms |
5980 KB |
Output is correct |
12 |
Correct |
2 ms |
5980 KB |
Output is correct |
13 |
Correct |
2 ms |
5980 KB |
Output is correct |
14 |
Correct |
1 ms |
5980 KB |
Output is correct |
15 |
Correct |
31 ms |
7004 KB |
Output is correct |
16 |
Correct |
27 ms |
7048 KB |
Output is correct |
17 |
Correct |
28 ms |
7000 KB |
Output is correct |
18 |
Correct |
7 ms |
7004 KB |
Output is correct |
19 |
Correct |
6 ms |
6748 KB |
Output is correct |
20 |
Correct |
31 ms |
7264 KB |
Output is correct |
21 |
Correct |
34 ms |
7000 KB |
Output is correct |
22 |
Correct |
2 ms |
5980 KB |
Output is correct |
23 |
Correct |
5 ms |
6696 KB |
Output is correct |
24 |
Correct |
6 ms |
6696 KB |
Output is correct |
25 |
Correct |
2 ms |
5980 KB |
Output is correct |
26 |
Correct |
1 ms |
6168 KB |
Output is correct |
27 |
Correct |
6 ms |
7000 KB |
Output is correct |
28 |
Correct |
6 ms |
6752 KB |
Output is correct |
29 |
Correct |
5 ms |
6696 KB |
Output is correct |
30 |
Correct |
5 ms |
6488 KB |
Output is correct |
31 |
Correct |
2 ms |
5980 KB |
Output is correct |
32 |
Correct |
1 ms |
5980 KB |
Output is correct |
33 |
Correct |
2 ms |
5980 KB |
Output is correct |
34 |
Correct |
2 ms |
5980 KB |
Output is correct |
35 |
Correct |
2 ms |
5980 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
99 ms |
28264 KB |
Output is correct |
2 |
Correct |
2 ms |
5980 KB |
Output is correct |
3 |
Correct |
88 ms |
27664 KB |
Output is correct |
4 |
Correct |
79 ms |
27220 KB |
Output is correct |
5 |
Correct |
106 ms |
27984 KB |
Output is correct |
6 |
Correct |
87 ms |
28560 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
75 ms |
23808 KB |
Output is correct |
2 |
Correct |
82 ms |
20348 KB |
Output is correct |
3 |
Correct |
80 ms |
19876 KB |
Output is correct |
4 |
Correct |
97 ms |
20048 KB |
Output is correct |
5 |
Correct |
80 ms |
20060 KB |
Output is correct |
6 |
Correct |
75 ms |
24048 KB |
Output is correct |
7 |
Correct |
72 ms |
23924 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
75 ms |
23808 KB |
Output is correct |
2 |
Correct |
82 ms |
20348 KB |
Output is correct |
3 |
Correct |
80 ms |
19876 KB |
Output is correct |
4 |
Correct |
97 ms |
20048 KB |
Output is correct |
5 |
Correct |
80 ms |
20060 KB |
Output is correct |
6 |
Correct |
75 ms |
24048 KB |
Output is correct |
7 |
Correct |
72 ms |
23924 KB |
Output is correct |
8 |
Correct |
78 ms |
23824 KB |
Output is correct |
9 |
Correct |
76 ms |
23948 KB |
Output is correct |
10 |
Correct |
89 ms |
28104 KB |
Output is correct |
11 |
Correct |
82 ms |
28124 KB |
Output is correct |
12 |
Correct |
71 ms |
19796 KB |
Output is correct |
13 |
Correct |
65 ms |
19796 KB |
Output is correct |
14 |
Correct |
87 ms |
19796 KB |
Output is correct |
15 |
Correct |
85 ms |
19880 KB |
Output is correct |
16 |
Correct |
82 ms |
20052 KB |
Output is correct |
17 |
Correct |
83 ms |
19924 KB |
Output is correct |
18 |
Correct |
81 ms |
20048 KB |
Output is correct |
19 |
Correct |
79 ms |
20304 KB |
Output is correct |
20 |
Correct |
79 ms |
24144 KB |
Output is correct |
21 |
Correct |
79 ms |
24408 KB |
Output is correct |
22 |
Correct |
79 ms |
24180 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
2 ms |
5976 KB |
Output is correct |
2 |
Correct |
5 ms |
6688 KB |
Output is correct |
3 |
Correct |
5 ms |
6492 KB |
Output is correct |
4 |
Correct |
2 ms |
5980 KB |
Output is correct |
5 |
Correct |
1 ms |
6164 KB |
Output is correct |
6 |
Correct |
6 ms |
7004 KB |
Output is correct |
7 |
Correct |
6 ms |
6680 KB |
Output is correct |
8 |
Correct |
5 ms |
6688 KB |
Output is correct |
9 |
Correct |
5 ms |
6492 KB |
Output is correct |
10 |
Correct |
2 ms |
5980 KB |
Output is correct |
11 |
Correct |
1 ms |
5980 KB |
Output is correct |
12 |
Correct |
2 ms |
5980 KB |
Output is correct |
13 |
Correct |
2 ms |
5980 KB |
Output is correct |
14 |
Correct |
1 ms |
5980 KB |
Output is correct |
15 |
Correct |
31 ms |
7004 KB |
Output is correct |
16 |
Correct |
27 ms |
7048 KB |
Output is correct |
17 |
Correct |
28 ms |
7000 KB |
Output is correct |
18 |
Correct |
7 ms |
7004 KB |
Output is correct |
19 |
Correct |
6 ms |
6748 KB |
Output is correct |
20 |
Correct |
31 ms |
7264 KB |
Output is correct |
21 |
Correct |
34 ms |
7000 KB |
Output is correct |
22 |
Correct |
2 ms |
5980 KB |
Output is correct |
23 |
Correct |
5 ms |
6696 KB |
Output is correct |
24 |
Correct |
6 ms |
6696 KB |
Output is correct |
25 |
Correct |
2 ms |
5980 KB |
Output is correct |
26 |
Correct |
1 ms |
6168 KB |
Output is correct |
27 |
Correct |
6 ms |
7000 KB |
Output is correct |
28 |
Correct |
6 ms |
6752 KB |
Output is correct |
29 |
Correct |
5 ms |
6696 KB |
Output is correct |
30 |
Correct |
5 ms |
6488 KB |
Output is correct |
31 |
Correct |
2 ms |
5980 KB |
Output is correct |
32 |
Correct |
1 ms |
5980 KB |
Output is correct |
33 |
Correct |
2 ms |
5980 KB |
Output is correct |
34 |
Correct |
2 ms |
5980 KB |
Output is correct |
35 |
Correct |
2 ms |
5980 KB |
Output is correct |
36 |
Correct |
99 ms |
28264 KB |
Output is correct |
37 |
Correct |
2 ms |
5980 KB |
Output is correct |
38 |
Correct |
88 ms |
27664 KB |
Output is correct |
39 |
Correct |
79 ms |
27220 KB |
Output is correct |
40 |
Correct |
106 ms |
27984 KB |
Output is correct |
41 |
Correct |
87 ms |
28560 KB |
Output is correct |
42 |
Correct |
75 ms |
23808 KB |
Output is correct |
43 |
Correct |
82 ms |
20348 KB |
Output is correct |
44 |
Correct |
80 ms |
19876 KB |
Output is correct |
45 |
Correct |
97 ms |
20048 KB |
Output is correct |
46 |
Correct |
80 ms |
20060 KB |
Output is correct |
47 |
Correct |
75 ms |
24048 KB |
Output is correct |
48 |
Correct |
72 ms |
23924 KB |
Output is correct |
49 |
Correct |
78 ms |
23824 KB |
Output is correct |
50 |
Correct |
76 ms |
23948 KB |
Output is correct |
51 |
Correct |
89 ms |
28104 KB |
Output is correct |
52 |
Correct |
82 ms |
28124 KB |
Output is correct |
53 |
Correct |
71 ms |
19796 KB |
Output is correct |
54 |
Correct |
65 ms |
19796 KB |
Output is correct |
55 |
Correct |
87 ms |
19796 KB |
Output is correct |
56 |
Correct |
85 ms |
19880 KB |
Output is correct |
57 |
Correct |
82 ms |
20052 KB |
Output is correct |
58 |
Correct |
83 ms |
19924 KB |
Output is correct |
59 |
Correct |
81 ms |
20048 KB |
Output is correct |
60 |
Correct |
79 ms |
20304 KB |
Output is correct |
61 |
Correct |
79 ms |
24144 KB |
Output is correct |
62 |
Correct |
79 ms |
24408 KB |
Output is correct |
63 |
Correct |
79 ms |
24180 KB |
Output is correct |
64 |
Correct |
78 ms |
24084 KB |
Output is correct |
65 |
Correct |
95 ms |
20044 KB |
Output is correct |
66 |
Correct |
84 ms |
19992 KB |
Output is correct |
67 |
Correct |
98 ms |
19892 KB |
Output is correct |
68 |
Correct |
58 ms |
19536 KB |
Output is correct |
69 |
Correct |
53 ms |
19612 KB |
Output is correct |
70 |
Correct |
78 ms |
24416 KB |
Output is correct |
71 |
Correct |
84 ms |
23832 KB |
Output is correct |
72 |
Correct |
2 ms |
5980 KB |
Output is correct |
73 |
Correct |
5 ms |
6492 KB |
Output is correct |
74 |
Correct |
5 ms |
6492 KB |
Output is correct |
75 |
Correct |
1 ms |
5980 KB |
Output is correct |
76 |
Correct |
2 ms |
5980 KB |
Output is correct |
77 |
Correct |
6 ms |
7000 KB |
Output is correct |
78 |
Correct |
5 ms |
6748 KB |
Output is correct |
79 |
Correct |
5 ms |
6688 KB |
Output is correct |
80 |
Correct |
5 ms |
6492 KB |
Output is correct |
81 |
Correct |
2 ms |
6168 KB |
Output is correct |
82 |
Correct |
2 ms |
5980 KB |
Output is correct |
83 |
Correct |
2 ms |
5980 KB |
Output is correct |
84 |
Correct |
2 ms |
5980 KB |
Output is correct |
85 |
Correct |
1 ms |
5980 KB |
Output is correct |
86 |
Correct |
27 ms |
7040 KB |
Output is correct |
87 |
Correct |
27 ms |
7004 KB |
Output is correct |
88 |
Correct |
27 ms |
7044 KB |
Output is correct |
89 |
Correct |
8 ms |
7004 KB |
Output is correct |
90 |
Correct |
5 ms |
6748 KB |
Output is correct |
91 |
Correct |
31 ms |
6996 KB |
Output is correct |
92 |
Correct |
34 ms |
7248 KB |
Output is correct |
93 |
Correct |
2 ms |
5980 KB |
Output is correct |
94 |
Correct |
96 ms |
27992 KB |
Output is correct |
95 |
Correct |
82 ms |
27744 KB |
Output is correct |
96 |
Correct |
80 ms |
27228 KB |
Output is correct |
97 |
Correct |
88 ms |
28108 KB |
Output is correct |
98 |
Correct |
97 ms |
28492 KB |
Output is correct |
99 |
Correct |
94 ms |
20068 KB |
Output is correct |
100 |
Correct |
81 ms |
20048 KB |
Output is correct |
101 |
Correct |
103 ms |
20052 KB |
Output is correct |
102 |
Correct |
89 ms |
20424 KB |
Output is correct |
103 |
Correct |
73 ms |
23828 KB |
Output is correct |
104 |
Correct |
75 ms |
24112 KB |
Output is correct |
105 |
Correct |
72 ms |
23892 KB |
Output is correct |
106 |
Correct |
93 ms |
24320 KB |
Output is correct |
107 |
Correct |
76 ms |
23804 KB |
Output is correct |
108 |
Correct |
95 ms |
28108 KB |
Output is correct |
109 |
Correct |
82 ms |
28148 KB |
Output is correct |
110 |
Correct |
71 ms |
19716 KB |
Output is correct |
111 |
Correct |
69 ms |
19792 KB |
Output is correct |
112 |
Correct |
82 ms |
19888 KB |
Output is correct |
113 |
Correct |
87 ms |
20144 KB |
Output is correct |