#include<bits/stdc++.h>
using namespace std;
#define int long long
#define f first
#define s second
const int N = 1e5 + 69;
const int lg = 17;
int up[N][lg];
int n, m, k, tin[N], tout[N], timer;
vector<int> g[N];
set<int> st[N], er[N];
set<tuple<int, int, int>> edges;
vector<int> ans;
bool anc(int v, int u) {
return tin[v] <= tin[u] && tout[v] >= tout[u];
}
int lca(int a, int b) {
if (anc(a, b))
return a;
else if (anc(b, a))
return b;
for (int i = lg - 1;i >= 0;i--) {
if (!anc(up[a][i], b) && up[a][i] > 0)
a = up[a][i];
}
return up[a][0];
}
void dfs(int v, int p) {
tin[v] = ++timer;
up[v][0] = p;
for (int i = 1;i < lg;i++)
up[v][i] = up[up[v][i - 1]][i - 1];
for (auto u : g[v]) {
if (u == p)
continue;
dfs(u, v);
}
tout[v] = timer;
}
void solve(int v, int p) {
for (auto u : g[v]) {
if (u == p)
continue;
solve(u, v);
if (st[v].size() < st[u].size())
swap(st[u], st[v]);
for (auto x : st[u])
st[v].insert(x);
}
for (auto u : er[v]) {
assert(st[v].count(u) > 0);
st[v].erase(u);
}
if (p != 0) {
int a = v, b = p;
if (a > b)
swap(a, b);
if (st[v].size() >= k) {
auto u = *edges.lower_bound({a, b, -1});
ans.push_back(get<2>(u));
}
}
}
signed main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
int tt = 1;
//cin >> tt;
while (tt--) {
cin >> n >> m >> k;
for (int i = 1;i <= n - 1;i++) {
int a, b;
cin >> a >> b;
g[a].push_back(b);
g[b].push_back(a);
if (a > b)
swap(a, b);
edges.insert({a, b, i});
}
dfs(1, 0);
for (int i = 1;i <= m;i++) {
int s;
cin >> s;
vector<int> y(s);
for (int j = 0;j < s;j++)
cin >> y[j];
int lc = y[0];
for (int j = 1; j < s;j++)
lc = lca(lc, y[j]);
er[lc].insert(i);
for (int j = 0;j < s;j++) {
if (y[j] != lc)
st[y[j]].insert(i);
}
}
solve(1, 0);
sort(ans.begin(), ans.end());
cout << ans.size() << '\n';
for (auto u : ans)
cout << u << " ";
}
return 0;
}
Compilation message
railway.cpp: In function 'void solve(long long int, long long int)':
railway.cpp:58:20: warning: comparison of integer expressions of different signedness: 'std::set<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
58 | if (st[v].size() >= k) {
| ~~~~~~~~~~~~~^~~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
3 ms |
14936 KB |
Output is correct |
2 |
Correct |
8 ms |
18288 KB |
Output is correct |
3 |
Correct |
7 ms |
18100 KB |
Output is correct |
4 |
Correct |
3 ms |
14940 KB |
Output is correct |
5 |
Correct |
4 ms |
14940 KB |
Output is correct |
6 |
Correct |
9 ms |
19036 KB |
Output is correct |
7 |
Correct |
8 ms |
18268 KB |
Output is correct |
8 |
Correct |
10 ms |
18268 KB |
Output is correct |
9 |
Correct |
8 ms |
18268 KB |
Output is correct |
10 |
Correct |
3 ms |
14940 KB |
Output is correct |
11 |
Correct |
3 ms |
14940 KB |
Output is correct |
12 |
Correct |
3 ms |
15452 KB |
Output is correct |
13 |
Correct |
3 ms |
14940 KB |
Output is correct |
14 |
Correct |
3 ms |
14940 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
3 ms |
14936 KB |
Output is correct |
2 |
Correct |
8 ms |
18288 KB |
Output is correct |
3 |
Correct |
7 ms |
18100 KB |
Output is correct |
4 |
Correct |
3 ms |
14940 KB |
Output is correct |
5 |
Correct |
4 ms |
14940 KB |
Output is correct |
6 |
Correct |
9 ms |
19036 KB |
Output is correct |
7 |
Correct |
8 ms |
18268 KB |
Output is correct |
8 |
Correct |
10 ms |
18268 KB |
Output is correct |
9 |
Correct |
8 ms |
18268 KB |
Output is correct |
10 |
Correct |
3 ms |
14940 KB |
Output is correct |
11 |
Correct |
3 ms |
14940 KB |
Output is correct |
12 |
Correct |
3 ms |
15452 KB |
Output is correct |
13 |
Correct |
3 ms |
14940 KB |
Output is correct |
14 |
Correct |
3 ms |
14940 KB |
Output is correct |
15 |
Correct |
31 ms |
23992 KB |
Output is correct |
16 |
Correct |
32 ms |
24156 KB |
Output is correct |
17 |
Correct |
32 ms |
24184 KB |
Output is correct |
18 |
Correct |
9 ms |
19036 KB |
Output is correct |
19 |
Correct |
9 ms |
18472 KB |
Output is correct |
20 |
Correct |
31 ms |
23488 KB |
Output is correct |
21 |
Correct |
31 ms |
23120 KB |
Output is correct |
22 |
Correct |
3 ms |
14940 KB |
Output is correct |
23 |
Correct |
8 ms |
18076 KB |
Output is correct |
24 |
Correct |
8 ms |
18268 KB |
Output is correct |
25 |
Correct |
3 ms |
14940 KB |
Output is correct |
26 |
Correct |
3 ms |
14940 KB |
Output is correct |
27 |
Correct |
9 ms |
19036 KB |
Output is correct |
28 |
Correct |
7 ms |
18268 KB |
Output is correct |
29 |
Correct |
7 ms |
18264 KB |
Output is correct |
30 |
Correct |
10 ms |
18268 KB |
Output is correct |
31 |
Correct |
3 ms |
14768 KB |
Output is correct |
32 |
Correct |
4 ms |
15192 KB |
Output is correct |
33 |
Correct |
3 ms |
14940 KB |
Output is correct |
34 |
Correct |
3 ms |
14940 KB |
Output is correct |
35 |
Correct |
3 ms |
14936 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
124 ms |
57264 KB |
Output is correct |
2 |
Correct |
3 ms |
14940 KB |
Output is correct |
3 |
Correct |
123 ms |
58288 KB |
Output is correct |
4 |
Correct |
106 ms |
57680 KB |
Output is correct |
5 |
Correct |
111 ms |
57856 KB |
Output is correct |
6 |
Correct |
117 ms |
60104 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
132 ms |
52048 KB |
Output is correct |
2 |
Correct |
146 ms |
48884 KB |
Output is correct |
3 |
Correct |
164 ms |
54868 KB |
Output is correct |
4 |
Correct |
160 ms |
54576 KB |
Output is correct |
5 |
Correct |
171 ms |
54860 KB |
Output is correct |
6 |
Correct |
143 ms |
52480 KB |
Output is correct |
7 |
Correct |
127 ms |
51944 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
132 ms |
52048 KB |
Output is correct |
2 |
Correct |
146 ms |
48884 KB |
Output is correct |
3 |
Correct |
164 ms |
54868 KB |
Output is correct |
4 |
Correct |
160 ms |
54576 KB |
Output is correct |
5 |
Correct |
171 ms |
54860 KB |
Output is correct |
6 |
Correct |
143 ms |
52480 KB |
Output is correct |
7 |
Correct |
127 ms |
51944 KB |
Output is correct |
8 |
Correct |
113 ms |
50772 KB |
Output is correct |
9 |
Correct |
125 ms |
50548 KB |
Output is correct |
10 |
Correct |
97 ms |
56516 KB |
Output is correct |
11 |
Correct |
96 ms |
56516 KB |
Output is correct |
12 |
Correct |
77 ms |
41812 KB |
Output is correct |
13 |
Correct |
75 ms |
41808 KB |
Output is correct |
14 |
Correct |
127 ms |
47736 KB |
Output is correct |
15 |
Correct |
121 ms |
47956 KB |
Output is correct |
16 |
Correct |
165 ms |
55804 KB |
Output is correct |
17 |
Correct |
164 ms |
56288 KB |
Output is correct |
18 |
Correct |
166 ms |
54484 KB |
Output is correct |
19 |
Correct |
157 ms |
49520 KB |
Output is correct |
20 |
Correct |
129 ms |
52564 KB |
Output is correct |
21 |
Correct |
133 ms |
52688 KB |
Output is correct |
22 |
Correct |
139 ms |
52948 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
3 ms |
14936 KB |
Output is correct |
2 |
Correct |
8 ms |
18288 KB |
Output is correct |
3 |
Correct |
7 ms |
18100 KB |
Output is correct |
4 |
Correct |
3 ms |
14940 KB |
Output is correct |
5 |
Correct |
4 ms |
14940 KB |
Output is correct |
6 |
Correct |
9 ms |
19036 KB |
Output is correct |
7 |
Correct |
8 ms |
18268 KB |
Output is correct |
8 |
Correct |
10 ms |
18268 KB |
Output is correct |
9 |
Correct |
8 ms |
18268 KB |
Output is correct |
10 |
Correct |
3 ms |
14940 KB |
Output is correct |
11 |
Correct |
3 ms |
14940 KB |
Output is correct |
12 |
Correct |
3 ms |
15452 KB |
Output is correct |
13 |
Correct |
3 ms |
14940 KB |
Output is correct |
14 |
Correct |
3 ms |
14940 KB |
Output is correct |
15 |
Correct |
31 ms |
23992 KB |
Output is correct |
16 |
Correct |
32 ms |
24156 KB |
Output is correct |
17 |
Correct |
32 ms |
24184 KB |
Output is correct |
18 |
Correct |
9 ms |
19036 KB |
Output is correct |
19 |
Correct |
9 ms |
18472 KB |
Output is correct |
20 |
Correct |
31 ms |
23488 KB |
Output is correct |
21 |
Correct |
31 ms |
23120 KB |
Output is correct |
22 |
Correct |
3 ms |
14940 KB |
Output is correct |
23 |
Correct |
8 ms |
18076 KB |
Output is correct |
24 |
Correct |
8 ms |
18268 KB |
Output is correct |
25 |
Correct |
3 ms |
14940 KB |
Output is correct |
26 |
Correct |
3 ms |
14940 KB |
Output is correct |
27 |
Correct |
9 ms |
19036 KB |
Output is correct |
28 |
Correct |
7 ms |
18268 KB |
Output is correct |
29 |
Correct |
7 ms |
18264 KB |
Output is correct |
30 |
Correct |
10 ms |
18268 KB |
Output is correct |
31 |
Correct |
3 ms |
14768 KB |
Output is correct |
32 |
Correct |
4 ms |
15192 KB |
Output is correct |
33 |
Correct |
3 ms |
14940 KB |
Output is correct |
34 |
Correct |
3 ms |
14940 KB |
Output is correct |
35 |
Correct |
3 ms |
14936 KB |
Output is correct |
36 |
Correct |
124 ms |
57264 KB |
Output is correct |
37 |
Correct |
3 ms |
14940 KB |
Output is correct |
38 |
Correct |
123 ms |
58288 KB |
Output is correct |
39 |
Correct |
106 ms |
57680 KB |
Output is correct |
40 |
Correct |
111 ms |
57856 KB |
Output is correct |
41 |
Correct |
117 ms |
60104 KB |
Output is correct |
42 |
Correct |
132 ms |
52048 KB |
Output is correct |
43 |
Correct |
146 ms |
48884 KB |
Output is correct |
44 |
Correct |
164 ms |
54868 KB |
Output is correct |
45 |
Correct |
160 ms |
54576 KB |
Output is correct |
46 |
Correct |
171 ms |
54860 KB |
Output is correct |
47 |
Correct |
143 ms |
52480 KB |
Output is correct |
48 |
Correct |
127 ms |
51944 KB |
Output is correct |
49 |
Correct |
113 ms |
50772 KB |
Output is correct |
50 |
Correct |
125 ms |
50548 KB |
Output is correct |
51 |
Correct |
97 ms |
56516 KB |
Output is correct |
52 |
Correct |
96 ms |
56516 KB |
Output is correct |
53 |
Correct |
77 ms |
41812 KB |
Output is correct |
54 |
Correct |
75 ms |
41808 KB |
Output is correct |
55 |
Correct |
127 ms |
47736 KB |
Output is correct |
56 |
Correct |
121 ms |
47956 KB |
Output is correct |
57 |
Correct |
165 ms |
55804 KB |
Output is correct |
58 |
Correct |
164 ms |
56288 KB |
Output is correct |
59 |
Correct |
166 ms |
54484 KB |
Output is correct |
60 |
Correct |
157 ms |
49520 KB |
Output is correct |
61 |
Correct |
129 ms |
52564 KB |
Output is correct |
62 |
Correct |
133 ms |
52688 KB |
Output is correct |
63 |
Correct |
139 ms |
52948 KB |
Output is correct |
64 |
Correct |
120 ms |
52684 KB |
Output is correct |
65 |
Correct |
197 ms |
62468 KB |
Output is correct |
66 |
Correct |
156 ms |
56400 KB |
Output is correct |
67 |
Correct |
134 ms |
52052 KB |
Output is correct |
68 |
Correct |
71 ms |
41300 KB |
Output is correct |
69 |
Correct |
70 ms |
41300 KB |
Output is correct |
70 |
Correct |
131 ms |
54216 KB |
Output is correct |
71 |
Correct |
108 ms |
51688 KB |
Output is correct |
72 |
Correct |
3 ms |
14940 KB |
Output is correct |
73 |
Correct |
7 ms |
18268 KB |
Output is correct |
74 |
Correct |
8 ms |
18064 KB |
Output is correct |
75 |
Correct |
3 ms |
14784 KB |
Output is correct |
76 |
Correct |
3 ms |
14936 KB |
Output is correct |
77 |
Correct |
9 ms |
19192 KB |
Output is correct |
78 |
Correct |
7 ms |
18268 KB |
Output is correct |
79 |
Correct |
9 ms |
18268 KB |
Output is correct |
80 |
Correct |
8 ms |
18268 KB |
Output is correct |
81 |
Correct |
3 ms |
15004 KB |
Output is correct |
82 |
Correct |
3 ms |
14940 KB |
Output is correct |
83 |
Correct |
2 ms |
14940 KB |
Output is correct |
84 |
Correct |
5 ms |
14940 KB |
Output is correct |
85 |
Correct |
3 ms |
14940 KB |
Output is correct |
86 |
Correct |
31 ms |
24136 KB |
Output is correct |
87 |
Correct |
32 ms |
24152 KB |
Output is correct |
88 |
Correct |
41 ms |
24408 KB |
Output is correct |
89 |
Correct |
9 ms |
19032 KB |
Output is correct |
90 |
Correct |
8 ms |
18488 KB |
Output is correct |
91 |
Correct |
30 ms |
23388 KB |
Output is correct |
92 |
Correct |
31 ms |
23384 KB |
Output is correct |
93 |
Correct |
3 ms |
14940 KB |
Output is correct |
94 |
Correct |
124 ms |
58656 KB |
Output is correct |
95 |
Correct |
120 ms |
58448 KB |
Output is correct |
96 |
Correct |
113 ms |
57680 KB |
Output is correct |
97 |
Correct |
103 ms |
57596 KB |
Output is correct |
98 |
Correct |
117 ms |
60292 KB |
Output is correct |
99 |
Correct |
176 ms |
59556 KB |
Output is correct |
100 |
Correct |
162 ms |
56660 KB |
Output is correct |
101 |
Correct |
164 ms |
56972 KB |
Output is correct |
102 |
Correct |
144 ms |
50444 KB |
Output is correct |
103 |
Correct |
130 ms |
53588 KB |
Output is correct |
104 |
Correct |
130 ms |
54092 KB |
Output is correct |
105 |
Correct |
126 ms |
53332 KB |
Output is correct |
106 |
Correct |
114 ms |
51976 KB |
Output is correct |
107 |
Correct |
111 ms |
51792 KB |
Output is correct |
108 |
Correct |
97 ms |
57540 KB |
Output is correct |
109 |
Correct |
98 ms |
57544 KB |
Output is correct |
110 |
Correct |
75 ms |
42832 KB |
Output is correct |
111 |
Correct |
82 ms |
43040 KB |
Output is correct |
112 |
Correct |
122 ms |
48596 KB |
Output is correct |
113 |
Correct |
126 ms |
48584 KB |
Output is correct |