#include <bits/stdc++.h>
using namespace std;
#define task ""
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i)
#define FORD(i, a, b) for (int i = (b), _a = (a); i >= _a; --i)
template <typename T1, typename T2> bool minimize(T1 &a, T2 b) {
if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b) {
if (a < b) {a = b; return true;} return false;
}
const int dx[] = {-1, 0, 0, +1};
const int dy[] = {0, -1, +1, 0};
const int MAX = 100100;
int n, k, m;
int ID[MAX];
vector<int> res;
set<int> add[MAX];
vector<int> del[MAX];
int h[MAX], anc[17][MAX];
vector<pair<int, int>> adj[MAX];
void dfs(int u, int p) {
for (pair<int, int> &x: adj[u]) if (x.fi != p) {
int v = x.fi;
ID[v] = x.se;
anc[0][v] = u;
h[v] = h[u] + 1;
for (int j = 1; j <= 16; ++j) {
anc[j][v] = anc[j - 1][anc[j - 1][v]];
}
dfs(v, u);
}
}
int lca(int u, int v) {
if (h[u] < h[v]) swap(u, v);
int k = h[u] - h[v];
for (int j = 0; (1 << j) <= k; ++j) {
if (k >> j & 1) u = anc[j][u];
}
if (u == v) return u;
for (int j = 16; j >= 0; --j) {
if (anc[j][u] != anc[j][v]) {
u = anc[j][u];
v = anc[j][v];
}
}
return anc[0][u];
}
void reDfs(int u, int p) {
for (pair<int, int> &x: adj[u]) if (x.fi != p) {
int v = x.fi; reDfs(v, u); if (add[u].size() < add[v].size()) add[u].swap(add[v]);
for (int x: add[v]) add[u].insert(x);
}
for (int &x: del[u]) add[u].erase(x);
if (add[u].size() >= k && u != 1) {
res.push_back(ID[u]);
}
}
int main() {
ios_base::sync_with_stdio(false); cin.tie(nullptr);
if (fopen(task".inp", "r")) {
freopen(task".inp", "r", stdin);
freopen(task".out", "w", stdout);
}
cin >> n >> m >> k;
for (int i = 1; i < n; ++i) {
int u, v; cin >> u >> v;
adj[u].push_back({v, i});
adj[v].push_back({u, i});
}
dfs(1, -1);
for (int i = 1; i <= m; ++i) {
int s, c, u; cin >> s >> c;
--s; add[c].insert(i);
while (s--) {
cin >> u;
c = lca(c, u);
add[u].insert(i);
}
del[c].push_back(i);
}
reDfs(1, -1);
sort(all(res));
cout << res.size() << '\n';
for (int &x: res) cout << x << ' ';
return 0;
}
Compilation message
railway.cpp: In function 'void reDfs(int, int)':
railway.cpp:64:23: warning: comparison of integer expressions of different signedness: 'std::set<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
64 | if (add[u].size() >= k && u != 1) {
| ~~~~~~~~~~~~~~^~~~
railway.cpp: In function 'int main()':
railway.cpp:73:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
73 | freopen(task".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
railway.cpp:74:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
74 | freopen(task".out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
4 ms |
9812 KB |
Output is correct |
2 |
Correct |
8 ms |
11068 KB |
Output is correct |
3 |
Correct |
10 ms |
11164 KB |
Output is correct |
4 |
Correct |
4 ms |
9812 KB |
Output is correct |
5 |
Correct |
5 ms |
9740 KB |
Output is correct |
6 |
Correct |
9 ms |
11940 KB |
Output is correct |
7 |
Correct |
9 ms |
11292 KB |
Output is correct |
8 |
Correct |
8 ms |
11220 KB |
Output is correct |
9 |
Correct |
8 ms |
11220 KB |
Output is correct |
10 |
Correct |
4 ms |
9740 KB |
Output is correct |
11 |
Correct |
5 ms |
9812 KB |
Output is correct |
12 |
Correct |
4 ms |
9812 KB |
Output is correct |
13 |
Correct |
4 ms |
9812 KB |
Output is correct |
14 |
Correct |
4 ms |
9812 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
4 ms |
9812 KB |
Output is correct |
2 |
Correct |
8 ms |
11068 KB |
Output is correct |
3 |
Correct |
10 ms |
11164 KB |
Output is correct |
4 |
Correct |
4 ms |
9812 KB |
Output is correct |
5 |
Correct |
5 ms |
9740 KB |
Output is correct |
6 |
Correct |
9 ms |
11940 KB |
Output is correct |
7 |
Correct |
9 ms |
11292 KB |
Output is correct |
8 |
Correct |
8 ms |
11220 KB |
Output is correct |
9 |
Correct |
8 ms |
11220 KB |
Output is correct |
10 |
Correct |
4 ms |
9740 KB |
Output is correct |
11 |
Correct |
5 ms |
9812 KB |
Output is correct |
12 |
Correct |
4 ms |
9812 KB |
Output is correct |
13 |
Correct |
4 ms |
9812 KB |
Output is correct |
14 |
Correct |
4 ms |
9812 KB |
Output is correct |
15 |
Correct |
34 ms |
16924 KB |
Output is correct |
16 |
Correct |
36 ms |
16968 KB |
Output is correct |
17 |
Correct |
36 ms |
16972 KB |
Output is correct |
18 |
Correct |
10 ms |
12060 KB |
Output is correct |
19 |
Correct |
9 ms |
11348 KB |
Output is correct |
20 |
Correct |
33 ms |
16236 KB |
Output is correct |
21 |
Correct |
35 ms |
16224 KB |
Output is correct |
22 |
Correct |
4 ms |
9812 KB |
Output is correct |
23 |
Correct |
9 ms |
11176 KB |
Output is correct |
24 |
Correct |
8 ms |
11092 KB |
Output is correct |
25 |
Correct |
5 ms |
9744 KB |
Output is correct |
26 |
Correct |
4 ms |
9748 KB |
Output is correct |
27 |
Correct |
9 ms |
11988 KB |
Output is correct |
28 |
Correct |
8 ms |
11280 KB |
Output is correct |
29 |
Correct |
7 ms |
11220 KB |
Output is correct |
30 |
Correct |
9 ms |
11296 KB |
Output is correct |
31 |
Correct |
4 ms |
9812 KB |
Output is correct |
32 |
Correct |
4 ms |
9812 KB |
Output is correct |
33 |
Correct |
5 ms |
9736 KB |
Output is correct |
34 |
Correct |
4 ms |
9812 KB |
Output is correct |
35 |
Correct |
5 ms |
9744 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
113 ms |
43732 KB |
Output is correct |
2 |
Correct |
5 ms |
9812 KB |
Output is correct |
3 |
Correct |
113 ms |
45236 KB |
Output is correct |
4 |
Correct |
106 ms |
44792 KB |
Output is correct |
5 |
Correct |
94 ms |
43660 KB |
Output is correct |
6 |
Correct |
115 ms |
46100 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
102 ms |
36132 KB |
Output is correct |
2 |
Correct |
136 ms |
32808 KB |
Output is correct |
3 |
Correct |
134 ms |
38384 KB |
Output is correct |
4 |
Correct |
141 ms |
38268 KB |
Output is correct |
5 |
Correct |
144 ms |
38468 KB |
Output is correct |
6 |
Correct |
108 ms |
38112 KB |
Output is correct |
7 |
Correct |
111 ms |
38108 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
102 ms |
36132 KB |
Output is correct |
2 |
Correct |
136 ms |
32808 KB |
Output is correct |
3 |
Correct |
134 ms |
38384 KB |
Output is correct |
4 |
Correct |
141 ms |
38268 KB |
Output is correct |
5 |
Correct |
144 ms |
38468 KB |
Output is correct |
6 |
Correct |
108 ms |
38112 KB |
Output is correct |
7 |
Correct |
111 ms |
38108 KB |
Output is correct |
8 |
Correct |
101 ms |
36744 KB |
Output is correct |
9 |
Correct |
107 ms |
36776 KB |
Output is correct |
10 |
Correct |
94 ms |
43532 KB |
Output is correct |
11 |
Correct |
87 ms |
43380 KB |
Output is correct |
12 |
Correct |
57 ms |
27120 KB |
Output is correct |
13 |
Correct |
71 ms |
27200 KB |
Output is correct |
14 |
Correct |
105 ms |
33200 KB |
Output is correct |
15 |
Correct |
132 ms |
33384 KB |
Output is correct |
16 |
Correct |
137 ms |
39240 KB |
Output is correct |
17 |
Correct |
138 ms |
39716 KB |
Output is correct |
18 |
Correct |
135 ms |
37464 KB |
Output is correct |
19 |
Correct |
127 ms |
33360 KB |
Output is correct |
20 |
Correct |
118 ms |
38432 KB |
Output is correct |
21 |
Correct |
105 ms |
38420 KB |
Output is correct |
22 |
Correct |
103 ms |
38420 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
4 ms |
9812 KB |
Output is correct |
2 |
Correct |
8 ms |
11068 KB |
Output is correct |
3 |
Correct |
10 ms |
11164 KB |
Output is correct |
4 |
Correct |
4 ms |
9812 KB |
Output is correct |
5 |
Correct |
5 ms |
9740 KB |
Output is correct |
6 |
Correct |
9 ms |
11940 KB |
Output is correct |
7 |
Correct |
9 ms |
11292 KB |
Output is correct |
8 |
Correct |
8 ms |
11220 KB |
Output is correct |
9 |
Correct |
8 ms |
11220 KB |
Output is correct |
10 |
Correct |
4 ms |
9740 KB |
Output is correct |
11 |
Correct |
5 ms |
9812 KB |
Output is correct |
12 |
Correct |
4 ms |
9812 KB |
Output is correct |
13 |
Correct |
4 ms |
9812 KB |
Output is correct |
14 |
Correct |
4 ms |
9812 KB |
Output is correct |
15 |
Correct |
34 ms |
16924 KB |
Output is correct |
16 |
Correct |
36 ms |
16968 KB |
Output is correct |
17 |
Correct |
36 ms |
16972 KB |
Output is correct |
18 |
Correct |
10 ms |
12060 KB |
Output is correct |
19 |
Correct |
9 ms |
11348 KB |
Output is correct |
20 |
Correct |
33 ms |
16236 KB |
Output is correct |
21 |
Correct |
35 ms |
16224 KB |
Output is correct |
22 |
Correct |
4 ms |
9812 KB |
Output is correct |
23 |
Correct |
9 ms |
11176 KB |
Output is correct |
24 |
Correct |
8 ms |
11092 KB |
Output is correct |
25 |
Correct |
5 ms |
9744 KB |
Output is correct |
26 |
Correct |
4 ms |
9748 KB |
Output is correct |
27 |
Correct |
9 ms |
11988 KB |
Output is correct |
28 |
Correct |
8 ms |
11280 KB |
Output is correct |
29 |
Correct |
7 ms |
11220 KB |
Output is correct |
30 |
Correct |
9 ms |
11296 KB |
Output is correct |
31 |
Correct |
4 ms |
9812 KB |
Output is correct |
32 |
Correct |
4 ms |
9812 KB |
Output is correct |
33 |
Correct |
5 ms |
9736 KB |
Output is correct |
34 |
Correct |
4 ms |
9812 KB |
Output is correct |
35 |
Correct |
5 ms |
9744 KB |
Output is correct |
36 |
Correct |
113 ms |
43732 KB |
Output is correct |
37 |
Correct |
5 ms |
9812 KB |
Output is correct |
38 |
Correct |
113 ms |
45236 KB |
Output is correct |
39 |
Correct |
106 ms |
44792 KB |
Output is correct |
40 |
Correct |
94 ms |
43660 KB |
Output is correct |
41 |
Correct |
115 ms |
46100 KB |
Output is correct |
42 |
Correct |
102 ms |
36132 KB |
Output is correct |
43 |
Correct |
136 ms |
32808 KB |
Output is correct |
44 |
Correct |
134 ms |
38384 KB |
Output is correct |
45 |
Correct |
141 ms |
38268 KB |
Output is correct |
46 |
Correct |
144 ms |
38468 KB |
Output is correct |
47 |
Correct |
108 ms |
38112 KB |
Output is correct |
48 |
Correct |
111 ms |
38108 KB |
Output is correct |
49 |
Correct |
101 ms |
36744 KB |
Output is correct |
50 |
Correct |
107 ms |
36776 KB |
Output is correct |
51 |
Correct |
94 ms |
43532 KB |
Output is correct |
52 |
Correct |
87 ms |
43380 KB |
Output is correct |
53 |
Correct |
57 ms |
27120 KB |
Output is correct |
54 |
Correct |
71 ms |
27200 KB |
Output is correct |
55 |
Correct |
105 ms |
33200 KB |
Output is correct |
56 |
Correct |
132 ms |
33384 KB |
Output is correct |
57 |
Correct |
137 ms |
39240 KB |
Output is correct |
58 |
Correct |
138 ms |
39716 KB |
Output is correct |
59 |
Correct |
135 ms |
37464 KB |
Output is correct |
60 |
Correct |
127 ms |
33360 KB |
Output is correct |
61 |
Correct |
118 ms |
38432 KB |
Output is correct |
62 |
Correct |
105 ms |
38420 KB |
Output is correct |
63 |
Correct |
103 ms |
38420 KB |
Output is correct |
64 |
Correct |
134 ms |
37276 KB |
Output is correct |
65 |
Correct |
175 ms |
44908 KB |
Output is correct |
66 |
Correct |
132 ms |
40524 KB |
Output is correct |
67 |
Correct |
134 ms |
36264 KB |
Output is correct |
68 |
Correct |
55 ms |
25620 KB |
Output is correct |
69 |
Correct |
67 ms |
25680 KB |
Output is correct |
70 |
Correct |
107 ms |
38452 KB |
Output is correct |
71 |
Correct |
90 ms |
36600 KB |
Output is correct |
72 |
Correct |
5 ms |
9812 KB |
Output is correct |
73 |
Correct |
8 ms |
11064 KB |
Output is correct |
74 |
Correct |
8 ms |
11092 KB |
Output is correct |
75 |
Correct |
5 ms |
9812 KB |
Output is correct |
76 |
Correct |
4 ms |
9740 KB |
Output is correct |
77 |
Correct |
8 ms |
11932 KB |
Output is correct |
78 |
Correct |
8 ms |
11220 KB |
Output is correct |
79 |
Correct |
8 ms |
11152 KB |
Output is correct |
80 |
Correct |
8 ms |
11220 KB |
Output is correct |
81 |
Correct |
4 ms |
9812 KB |
Output is correct |
82 |
Correct |
6 ms |
9812 KB |
Output is correct |
83 |
Correct |
4 ms |
9812 KB |
Output is correct |
84 |
Correct |
4 ms |
9744 KB |
Output is correct |
85 |
Correct |
5 ms |
9812 KB |
Output is correct |
86 |
Correct |
32 ms |
16972 KB |
Output is correct |
87 |
Correct |
34 ms |
16980 KB |
Output is correct |
88 |
Correct |
34 ms |
16932 KB |
Output is correct |
89 |
Correct |
9 ms |
12116 KB |
Output is correct |
90 |
Correct |
8 ms |
11296 KB |
Output is correct |
91 |
Correct |
37 ms |
16284 KB |
Output is correct |
92 |
Correct |
38 ms |
16180 KB |
Output is correct |
93 |
Correct |
5 ms |
9748 KB |
Output is correct |
94 |
Correct |
129 ms |
45500 KB |
Output is correct |
95 |
Correct |
111 ms |
45184 KB |
Output is correct |
96 |
Correct |
109 ms |
44684 KB |
Output is correct |
97 |
Correct |
101 ms |
43572 KB |
Output is correct |
98 |
Correct |
106 ms |
46080 KB |
Output is correct |
99 |
Correct |
170 ms |
41876 KB |
Output is correct |
100 |
Correct |
139 ms |
39064 KB |
Output is correct |
101 |
Correct |
152 ms |
39448 KB |
Output is correct |
102 |
Correct |
127 ms |
33004 KB |
Output is correct |
103 |
Correct |
115 ms |
38092 KB |
Output is correct |
104 |
Correct |
107 ms |
38480 KB |
Output is correct |
105 |
Correct |
112 ms |
38020 KB |
Output is correct |
106 |
Correct |
107 ms |
37012 KB |
Output is correct |
107 |
Correct |
106 ms |
36868 KB |
Output is correct |
108 |
Correct |
89 ms |
43460 KB |
Output is correct |
109 |
Correct |
82 ms |
43460 KB |
Output is correct |
110 |
Correct |
63 ms |
27156 KB |
Output is correct |
111 |
Correct |
60 ms |
27184 KB |
Output is correct |
112 |
Correct |
105 ms |
33024 KB |
Output is correct |
113 |
Correct |
116 ms |
33040 KB |
Output is correct |