// In the name of God
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define mp make_pair
typedef long long ll;
const int N = 1e5 + 5, MOD = 1e9 + 7, L = 20;
int n, m, k;
vector<pair<int, int> > adj[N];
vector<int> ans;
int dp[N], tin[N], tout[N], up[N][L];
int T;
void dfs(int v, int p) {
up[v][0] = p;
for (int l = 1; l < L; l++)
up[v][l] = up[up[v][l - 1]][l - 1];
tin[v] = ++T;
for (auto [u, i] : adj[v]) {
if (u != p)
dfs(u, v);
}
tout[v] = ++T;
}
bool anc(int v, int u) {
return tin[v] <= tin[u] && tout[v] >= tin[u];
}
int lca(int v, int u) {
if (tin[v] > tin[u])
swap(v, u);
if (anc(v, u))
return v;
for (int l = L - 1; l >= 0; l--)
if (!anc(up[v][l], u))
v = up[v][l];
return up[v][0];
}
void dfs2(int v, int p, int e) {
for (auto [u, i] : adj[v]) {
if (u != p) {
dfs2(u, v, i);
dp[v] += dp[u];
}
}
if (dp[v] >= k)
ans.pb(e);
}
void solve() {
cin >> n >> m >> k;
for (int i = 0; i < n - 1; i++) {
int v, u; cin >> v >> u;
adj[v].pb(mp(u, i + 1)), adj[u].pb(mp(v, i + 1));
}
dfs(1, 0);
tout[0] = 1e9;
for (int i = 0; i < m; i++) {
int s; cin >> s;
vector<pair<int, int> > vec;
for (int j = 0; j < s; j++) {
int v; cin >> v;
vec.pb(mp(tin[v], v));
}
sort(vec.begin(), vec.end());
int l2 = vec[0].se;
for (int i = 1; i < s; i++) {
int l = lca(vec[i].se, vec[i - 1].se);
l2 = lca(l, l2);
dp[l]--;
dp[vec[i - 1].se]++;
}
dp[l2]--;
dp[vec.back().se]++;
}
dfs2(1, 0, 0);
cout << ans.size() << '\n';
sort(ans.begin(), ans.end());
for (auto x : ans)
cout << x << ' ';
cout << '\n';
}
int32_t main() {
ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
solve();
return 0;
}
Compilation message
railway.cpp: In function 'void dfs(int, int)':
railway.cpp:21:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
21 | for (auto [u, i] : adj[v]) {
| ^
railway.cpp: In function 'void dfs2(int, int, int)':
railway.cpp:42:15: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
42 | for (auto [u, i] : adj[v]) {
| ^
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
2644 KB |
Output is correct |
2 |
Correct |
6 ms |
3968 KB |
Output is correct |
3 |
Correct |
6 ms |
4028 KB |
Output is correct |
4 |
Correct |
2 ms |
2644 KB |
Output is correct |
5 |
Correct |
2 ms |
2644 KB |
Output is correct |
6 |
Correct |
8 ms |
4516 KB |
Output is correct |
7 |
Correct |
6 ms |
4164 KB |
Output is correct |
8 |
Correct |
5 ms |
3968 KB |
Output is correct |
9 |
Correct |
5 ms |
4052 KB |
Output is correct |
10 |
Correct |
2 ms |
2676 KB |
Output is correct |
11 |
Correct |
2 ms |
2644 KB |
Output is correct |
12 |
Correct |
1 ms |
2676 KB |
Output is correct |
13 |
Correct |
2 ms |
2644 KB |
Output is correct |
14 |
Correct |
2 ms |
2644 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
2644 KB |
Output is correct |
2 |
Correct |
6 ms |
3968 KB |
Output is correct |
3 |
Correct |
6 ms |
4028 KB |
Output is correct |
4 |
Correct |
2 ms |
2644 KB |
Output is correct |
5 |
Correct |
2 ms |
2644 KB |
Output is correct |
6 |
Correct |
8 ms |
4516 KB |
Output is correct |
7 |
Correct |
6 ms |
4164 KB |
Output is correct |
8 |
Correct |
5 ms |
3968 KB |
Output is correct |
9 |
Correct |
5 ms |
4052 KB |
Output is correct |
10 |
Correct |
2 ms |
2676 KB |
Output is correct |
11 |
Correct |
2 ms |
2644 KB |
Output is correct |
12 |
Correct |
1 ms |
2676 KB |
Output is correct |
13 |
Correct |
2 ms |
2644 KB |
Output is correct |
14 |
Correct |
2 ms |
2644 KB |
Output is correct |
15 |
Correct |
23 ms |
4416 KB |
Output is correct |
16 |
Correct |
23 ms |
4428 KB |
Output is correct |
17 |
Correct |
24 ms |
4408 KB |
Output is correct |
18 |
Correct |
7 ms |
4436 KB |
Output is correct |
19 |
Correct |
6 ms |
4052 KB |
Output is correct |
20 |
Correct |
29 ms |
4500 KB |
Output is correct |
21 |
Correct |
30 ms |
4492 KB |
Output is correct |
22 |
Correct |
1 ms |
2644 KB |
Output is correct |
23 |
Correct |
5 ms |
4052 KB |
Output is correct |
24 |
Correct |
6 ms |
3968 KB |
Output is correct |
25 |
Correct |
2 ms |
2644 KB |
Output is correct |
26 |
Correct |
1 ms |
2644 KB |
Output is correct |
27 |
Correct |
7 ms |
4436 KB |
Output is correct |
28 |
Correct |
7 ms |
4096 KB |
Output is correct |
29 |
Correct |
6 ms |
4052 KB |
Output is correct |
30 |
Correct |
6 ms |
4092 KB |
Output is correct |
31 |
Correct |
2 ms |
2644 KB |
Output is correct |
32 |
Correct |
2 ms |
2644 KB |
Output is correct |
33 |
Correct |
2 ms |
2644 KB |
Output is correct |
34 |
Correct |
1 ms |
2644 KB |
Output is correct |
35 |
Correct |
2 ms |
2644 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
75 ms |
25280 KB |
Output is correct |
2 |
Correct |
2 ms |
2644 KB |
Output is correct |
3 |
Correct |
60 ms |
24944 KB |
Output is correct |
4 |
Correct |
59 ms |
24356 KB |
Output is correct |
5 |
Correct |
59 ms |
25212 KB |
Output is correct |
6 |
Correct |
63 ms |
25672 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
70 ms |
20980 KB |
Output is correct |
2 |
Correct |
81 ms |
17580 KB |
Output is correct |
3 |
Correct |
83 ms |
17084 KB |
Output is correct |
4 |
Correct |
93 ms |
17100 KB |
Output is correct |
5 |
Correct |
78 ms |
17096 KB |
Output is correct |
6 |
Correct |
65 ms |
21084 KB |
Output is correct |
7 |
Correct |
68 ms |
20940 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
70 ms |
20980 KB |
Output is correct |
2 |
Correct |
81 ms |
17580 KB |
Output is correct |
3 |
Correct |
83 ms |
17084 KB |
Output is correct |
4 |
Correct |
93 ms |
17100 KB |
Output is correct |
5 |
Correct |
78 ms |
17096 KB |
Output is correct |
6 |
Correct |
65 ms |
21084 KB |
Output is correct |
7 |
Correct |
68 ms |
20940 KB |
Output is correct |
8 |
Correct |
76 ms |
21068 KB |
Output is correct |
9 |
Correct |
85 ms |
21276 KB |
Output is correct |
10 |
Correct |
59 ms |
25384 KB |
Output is correct |
11 |
Correct |
80 ms |
25324 KB |
Output is correct |
12 |
Correct |
72 ms |
16884 KB |
Output is correct |
13 |
Correct |
66 ms |
16956 KB |
Output is correct |
14 |
Correct |
89 ms |
17068 KB |
Output is correct |
15 |
Correct |
85 ms |
17076 KB |
Output is correct |
16 |
Correct |
81 ms |
17140 KB |
Output is correct |
17 |
Correct |
82 ms |
17100 KB |
Output is correct |
18 |
Correct |
83 ms |
17100 KB |
Output is correct |
19 |
Correct |
82 ms |
17500 KB |
Output is correct |
20 |
Correct |
67 ms |
21388 KB |
Output is correct |
21 |
Correct |
71 ms |
21364 KB |
Output is correct |
22 |
Correct |
66 ms |
21288 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2 ms |
2644 KB |
Output is correct |
2 |
Correct |
6 ms |
3968 KB |
Output is correct |
3 |
Correct |
6 ms |
4028 KB |
Output is correct |
4 |
Correct |
2 ms |
2644 KB |
Output is correct |
5 |
Correct |
2 ms |
2644 KB |
Output is correct |
6 |
Correct |
8 ms |
4516 KB |
Output is correct |
7 |
Correct |
6 ms |
4164 KB |
Output is correct |
8 |
Correct |
5 ms |
3968 KB |
Output is correct |
9 |
Correct |
5 ms |
4052 KB |
Output is correct |
10 |
Correct |
2 ms |
2676 KB |
Output is correct |
11 |
Correct |
2 ms |
2644 KB |
Output is correct |
12 |
Correct |
1 ms |
2676 KB |
Output is correct |
13 |
Correct |
2 ms |
2644 KB |
Output is correct |
14 |
Correct |
2 ms |
2644 KB |
Output is correct |
15 |
Correct |
23 ms |
4416 KB |
Output is correct |
16 |
Correct |
23 ms |
4428 KB |
Output is correct |
17 |
Correct |
24 ms |
4408 KB |
Output is correct |
18 |
Correct |
7 ms |
4436 KB |
Output is correct |
19 |
Correct |
6 ms |
4052 KB |
Output is correct |
20 |
Correct |
29 ms |
4500 KB |
Output is correct |
21 |
Correct |
30 ms |
4492 KB |
Output is correct |
22 |
Correct |
1 ms |
2644 KB |
Output is correct |
23 |
Correct |
5 ms |
4052 KB |
Output is correct |
24 |
Correct |
6 ms |
3968 KB |
Output is correct |
25 |
Correct |
2 ms |
2644 KB |
Output is correct |
26 |
Correct |
1 ms |
2644 KB |
Output is correct |
27 |
Correct |
7 ms |
4436 KB |
Output is correct |
28 |
Correct |
7 ms |
4096 KB |
Output is correct |
29 |
Correct |
6 ms |
4052 KB |
Output is correct |
30 |
Correct |
6 ms |
4092 KB |
Output is correct |
31 |
Correct |
2 ms |
2644 KB |
Output is correct |
32 |
Correct |
2 ms |
2644 KB |
Output is correct |
33 |
Correct |
2 ms |
2644 KB |
Output is correct |
34 |
Correct |
1 ms |
2644 KB |
Output is correct |
35 |
Correct |
2 ms |
2644 KB |
Output is correct |
36 |
Correct |
75 ms |
25280 KB |
Output is correct |
37 |
Correct |
2 ms |
2644 KB |
Output is correct |
38 |
Correct |
60 ms |
24944 KB |
Output is correct |
39 |
Correct |
59 ms |
24356 KB |
Output is correct |
40 |
Correct |
59 ms |
25212 KB |
Output is correct |
41 |
Correct |
63 ms |
25672 KB |
Output is correct |
42 |
Correct |
70 ms |
20980 KB |
Output is correct |
43 |
Correct |
81 ms |
17580 KB |
Output is correct |
44 |
Correct |
83 ms |
17084 KB |
Output is correct |
45 |
Correct |
93 ms |
17100 KB |
Output is correct |
46 |
Correct |
78 ms |
17096 KB |
Output is correct |
47 |
Correct |
65 ms |
21084 KB |
Output is correct |
48 |
Correct |
68 ms |
20940 KB |
Output is correct |
49 |
Correct |
76 ms |
21068 KB |
Output is correct |
50 |
Correct |
85 ms |
21276 KB |
Output is correct |
51 |
Correct |
59 ms |
25384 KB |
Output is correct |
52 |
Correct |
80 ms |
25324 KB |
Output is correct |
53 |
Correct |
72 ms |
16884 KB |
Output is correct |
54 |
Correct |
66 ms |
16956 KB |
Output is correct |
55 |
Correct |
89 ms |
17068 KB |
Output is correct |
56 |
Correct |
85 ms |
17076 KB |
Output is correct |
57 |
Correct |
81 ms |
17140 KB |
Output is correct |
58 |
Correct |
82 ms |
17100 KB |
Output is correct |
59 |
Correct |
83 ms |
17100 KB |
Output is correct |
60 |
Correct |
82 ms |
17500 KB |
Output is correct |
61 |
Correct |
67 ms |
21388 KB |
Output is correct |
62 |
Correct |
71 ms |
21364 KB |
Output is correct |
63 |
Correct |
66 ms |
21288 KB |
Output is correct |
64 |
Correct |
70 ms |
21308 KB |
Output is correct |
65 |
Correct |
91 ms |
17164 KB |
Output is correct |
66 |
Correct |
112 ms |
17096 KB |
Output is correct |
67 |
Correct |
90 ms |
17100 KB |
Output is correct |
68 |
Correct |
62 ms |
16824 KB |
Output is correct |
69 |
Correct |
60 ms |
16884 KB |
Output is correct |
70 |
Correct |
75 ms |
21564 KB |
Output is correct |
71 |
Correct |
84 ms |
20944 KB |
Output is correct |
72 |
Correct |
2 ms |
2644 KB |
Output is correct |
73 |
Correct |
6 ms |
3968 KB |
Output is correct |
74 |
Correct |
6 ms |
4052 KB |
Output is correct |
75 |
Correct |
2 ms |
2676 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 |
4052 KB |
Output is correct |
79 |
Correct |
5 ms |
4052 KB |
Output is correct |
80 |
Correct |
5 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 |
2672 KB |
Output is correct |
85 |
Correct |
2 ms |
2680 KB |
Output is correct |
86 |
Correct |
25 ms |
4340 KB |
Output is correct |
87 |
Correct |
24 ms |
4428 KB |
Output is correct |
88 |
Correct |
23 ms |
4432 KB |
Output is correct |
89 |
Correct |
7 ms |
4436 KB |
Output is correct |
90 |
Correct |
6 ms |
4052 KB |
Output is correct |
91 |
Correct |
27 ms |
4636 KB |
Output is correct |
92 |
Correct |
29 ms |
4480 KB |
Output is correct |
93 |
Correct |
2 ms |
2644 KB |
Output is correct |
94 |
Correct |
70 ms |
25284 KB |
Output is correct |
95 |
Correct |
70 ms |
24952 KB |
Output is correct |
96 |
Correct |
58 ms |
24356 KB |
Output is correct |
97 |
Correct |
62 ms |
25304 KB |
Output is correct |
98 |
Correct |
69 ms |
25720 KB |
Output is correct |
99 |
Correct |
81 ms |
17116 KB |
Output is correct |
100 |
Correct |
81 ms |
17100 KB |
Output is correct |
101 |
Correct |
85 ms |
17404 KB |
Output is correct |
102 |
Correct |
84 ms |
17516 KB |
Output is correct |
103 |
Correct |
67 ms |
21008 KB |
Output is correct |
104 |
Correct |
67 ms |
21392 KB |
Output is correct |
105 |
Correct |
65 ms |
20988 KB |
Output is correct |
106 |
Correct |
75 ms |
21180 KB |
Output is correct |
107 |
Correct |
94 ms |
21064 KB |
Output is correct |
108 |
Correct |
60 ms |
25360 KB |
Output is correct |
109 |
Correct |
57 ms |
25332 KB |
Output is correct |
110 |
Correct |
68 ms |
16880 KB |
Output is correct |
111 |
Correct |
69 ms |
16876 KB |
Output is correct |
112 |
Correct |
95 ms |
17128 KB |
Output is correct |
113 |
Correct |
81 ms |
17036 KB |
Output is correct |