#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ff first
#define ss second
#define all(a) a.begin(), a.end()
const int N = 2e5;
const int LOG = 20;
int up[N+1][LOG+1], depth[N+1], sub[N+1];
int bigchild[N+1], chain[N+1], Pos[N+1];
int n, m, k;
vector< pair<int, int> > edge;
vector<int> ans, g[N+1], ministr[N+1], tins[N+1];
int tin[N+1], tout[N+1], T, position;
void dfs(int v, int p){
tin[v] = ++T;
up[v][0] = p;
for(int j = 1;j < LOG; j++) up[v][j] = up[up[v][j-1]][j-1];
sub[v] = 1;
int big=-1;
for(auto to : g[v]){
if(to != p){
depth[to] = depth[v]+1;
dfs(to, v);
sub[v]+= sub[to];
if(big == -1 or sub[big] < sub[to]){
big = to;
}
}
}
tout[v] = ++T;
bigchild[v] = big;
}
int upper(int v, int p){
return (tin[p] <= tin[v] and tout[v] <= tout[p]);
}
void decompose(int v, int head){
Pos[v] = ++position;
chain[v] = head;
if(bigchild[v] != -1){
decompose(bigchild[v], head);
}
for(auto to : g[v]){
if(to == up[v][0] or to == bigchild[v]) continue;
decompose(to, to);
}
}
int t[4*N], lazy[4*N];
void push(int v, int vl, int vr){
if(lazy[v] == 0) return;
t[v]+= (lazy[v] * (vr-vl+1));
if(vl != vr){
lazy[v<<1]+= lazy[v];
lazy[v<<1|1]+= lazy[v];
}
lazy[v] = 0;
}
void add(int l, int r, int x, int v, int vl, int vr){
push(v, vl, vr);
if(l > vr or vl > r) return;
if(l <= vl and r >= vr){
lazy[v]+= x;
push(v, vl, vr);
return;
}
int mid = (vl + vr)>>1;
add(l, r, x, v<<1, vl, mid);
add(l, r, x, v<<1|1, mid+1, vr);
t[v] = t[v<<1] + t[v<<1|1];
}
int get(int pos, int v, int vl, int vr){
push(v, vl, vr);
if(vl == vr) return t[v];
int mid = (vl + vr)>>1;
if(mid >= pos) return get(pos, v<<1, vl, mid);
else return get(pos, v<<1|1, mid+1, vr);
}
void query(int a, int b, int x){
for(; chain[a] != chain[b]; ){
if(depth[b] < depth[a]) swap(a, b);
add(min(Pos[b], Pos[chain[b]]), max(Pos[b], Pos[chain[b]]), x, 1, 1, n);
b = up[chain[b]][0];
}
if(depth[b] < depth[a]) swap(a, b);
add(min(Pos[a], Pos[b]), max(Pos[a], Pos[b]), x, 1, 1, n);
}
int lca(int a, int b){
if(depth[a] > depth[b]) swap(a, b);
if(upper(a, b)) return a;
int k =depth[b]-depth[a];
for(int i = 0;i < LOG; i++){
if(k&(1LL<<i)){
b = up[b][i];
}
}
if(a == b) return a;
for(int i = LOG-1; i >= 0; i--){
if(up[a][i] != up[b][i]){
a = up[a][i], b = up[b][i];
}
}
return up[a][0];
}
main(){
ios::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin >> n >> m >> k;
for(int i = 1;i < n; i++){
int a, b; cin >> a >> b;
edge.push_back({a, b});
g[a].push_back(b);
g[b].push_back(a);
}
dfs(1, 1);
decompose(1, 1);
for(int i = 1;i <= m; i++){
int sz; cin >> sz;
for(int j = 0;j < sz; j++){
int idx; cin >> idx;
ministr[i].push_back(idx);
}
}
vector<int> cnt(n, 0);
vector<int> ans;
for(int i = 1;i <= m; i++){
sort(all(ministr[i]), [&](int A, int B){
return tin[A] < tin[B];
});
for(int j = 0;j < ministr[i].size(); j++){
int a = ministr[i][j], b = ministr[i][(j + 1) % (int)ministr[i].size()];
// cout << a << ' ' << b << '\n';
int lc = lca(a, b);
query(a, lc, 1);
query(b, lc, 1);
add(Pos[lc], Pos[lc], -2, 1, 1, n);
}
// cout << '\n' << '\n';
}
for(int i = 0;i < n-1; i++){
int a = edge[i].ff, b = edge[i].ss;
if(tin[a] > tin[b]) swap(a, b);
cnt[i] = get(Pos[b], 1, 1, n);
if(cnt[i] >=2* k){
ans.push_back(i + 1);
}
}
sort(all(ans));
cout << ans.size() << '\n';
for(int x : ans) cout << x << ' ';
return 0;
}
Compilation message
railway.cpp:116:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
116 | main(){
| ^~~~
railway.cpp: In function 'int main()':
railway.cpp:141:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
141 | for(int j = 0;j < ministr[i].size(); j++){
| ~~^~~~~~~~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
24924 KB |
Output is correct |
2 |
Correct |
12 ms |
30284 KB |
Output is correct |
3 |
Correct |
11 ms |
30180 KB |
Output is correct |
4 |
Correct |
4 ms |
24924 KB |
Output is correct |
5 |
Correct |
4 ms |
24924 KB |
Output is correct |
6 |
Correct |
11 ms |
30680 KB |
Output is correct |
7 |
Correct |
11 ms |
30424 KB |
Output is correct |
8 |
Correct |
10 ms |
30168 KB |
Output is correct |
9 |
Correct |
11 ms |
30300 KB |
Output is correct |
10 |
Correct |
4 ms |
24924 KB |
Output is correct |
11 |
Correct |
4 ms |
24924 KB |
Output is correct |
12 |
Correct |
4 ms |
24924 KB |
Output is correct |
13 |
Correct |
4 ms |
24924 KB |
Output is correct |
14 |
Correct |
4 ms |
24924 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
24924 KB |
Output is correct |
2 |
Correct |
12 ms |
30284 KB |
Output is correct |
3 |
Correct |
11 ms |
30180 KB |
Output is correct |
4 |
Correct |
4 ms |
24924 KB |
Output is correct |
5 |
Correct |
4 ms |
24924 KB |
Output is correct |
6 |
Correct |
11 ms |
30680 KB |
Output is correct |
7 |
Correct |
11 ms |
30424 KB |
Output is correct |
8 |
Correct |
10 ms |
30168 KB |
Output is correct |
9 |
Correct |
11 ms |
30300 KB |
Output is correct |
10 |
Correct |
4 ms |
24924 KB |
Output is correct |
11 |
Correct |
4 ms |
24924 KB |
Output is correct |
12 |
Correct |
4 ms |
24924 KB |
Output is correct |
13 |
Correct |
4 ms |
24924 KB |
Output is correct |
14 |
Correct |
4 ms |
24924 KB |
Output is correct |
15 |
Correct |
84 ms |
31448 KB |
Output is correct |
16 |
Correct |
84 ms |
31808 KB |
Output is correct |
17 |
Correct |
85 ms |
31948 KB |
Output is correct |
18 |
Correct |
13 ms |
32728 KB |
Output is correct |
19 |
Correct |
12 ms |
30424 KB |
Output is correct |
20 |
Correct |
95 ms |
31812 KB |
Output is correct |
21 |
Correct |
98 ms |
31700 KB |
Output is correct |
22 |
Correct |
4 ms |
24924 KB |
Output is correct |
23 |
Correct |
12 ms |
32308 KB |
Output is correct |
24 |
Correct |
12 ms |
32244 KB |
Output is correct |
25 |
Correct |
4 ms |
24924 KB |
Output is correct |
26 |
Correct |
4 ms |
24924 KB |
Output is correct |
27 |
Correct |
12 ms |
30936 KB |
Output is correct |
28 |
Correct |
11 ms |
30420 KB |
Output is correct |
29 |
Correct |
11 ms |
30424 KB |
Output is correct |
30 |
Correct |
11 ms |
30420 KB |
Output is correct |
31 |
Correct |
4 ms |
24924 KB |
Output is correct |
32 |
Correct |
4 ms |
24924 KB |
Output is correct |
33 |
Correct |
4 ms |
24924 KB |
Output is correct |
34 |
Correct |
4 ms |
24924 KB |
Output is correct |
35 |
Correct |
4 ms |
24924 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
194 ms |
64708 KB |
Output is correct |
2 |
Correct |
4 ms |
24924 KB |
Output is correct |
3 |
Correct |
189 ms |
65216 KB |
Output is correct |
4 |
Correct |
181 ms |
63932 KB |
Output is correct |
5 |
Correct |
202 ms |
65508 KB |
Output is correct |
6 |
Correct |
191 ms |
66876 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
170 ms |
58116 KB |
Output is correct |
2 |
Correct |
206 ms |
54904 KB |
Output is correct |
3 |
Correct |
237 ms |
54852 KB |
Output is correct |
4 |
Correct |
295 ms |
55124 KB |
Output is correct |
5 |
Correct |
270 ms |
55368 KB |
Output is correct |
6 |
Correct |
177 ms |
59584 KB |
Output is correct |
7 |
Correct |
169 ms |
59096 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
170 ms |
58116 KB |
Output is correct |
2 |
Correct |
206 ms |
54904 KB |
Output is correct |
3 |
Correct |
237 ms |
54852 KB |
Output is correct |
4 |
Correct |
295 ms |
55124 KB |
Output is correct |
5 |
Correct |
270 ms |
55368 KB |
Output is correct |
6 |
Correct |
177 ms |
59584 KB |
Output is correct |
7 |
Correct |
169 ms |
59096 KB |
Output is correct |
8 |
Correct |
198 ms |
60036 KB |
Output is correct |
9 |
Correct |
208 ms |
60796 KB |
Output is correct |
10 |
Correct |
183 ms |
66048 KB |
Output is correct |
11 |
Correct |
173 ms |
65928 KB |
Output is correct |
12 |
Correct |
174 ms |
55740 KB |
Output is correct |
13 |
Correct |
169 ms |
55652 KB |
Output is correct |
14 |
Correct |
241 ms |
55892 KB |
Output is correct |
15 |
Correct |
239 ms |
56132 KB |
Output is correct |
16 |
Correct |
291 ms |
56396 KB |
Output is correct |
17 |
Correct |
277 ms |
55588 KB |
Output is correct |
18 |
Correct |
282 ms |
55836 KB |
Output is correct |
19 |
Correct |
204 ms |
55492 KB |
Output is correct |
20 |
Correct |
174 ms |
60292 KB |
Output is correct |
21 |
Correct |
183 ms |
61108 KB |
Output is correct |
22 |
Correct |
176 ms |
60356 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
4 ms |
24924 KB |
Output is correct |
2 |
Correct |
12 ms |
30284 KB |
Output is correct |
3 |
Correct |
11 ms |
30180 KB |
Output is correct |
4 |
Correct |
4 ms |
24924 KB |
Output is correct |
5 |
Correct |
4 ms |
24924 KB |
Output is correct |
6 |
Correct |
11 ms |
30680 KB |
Output is correct |
7 |
Correct |
11 ms |
30424 KB |
Output is correct |
8 |
Correct |
10 ms |
30168 KB |
Output is correct |
9 |
Correct |
11 ms |
30300 KB |
Output is correct |
10 |
Correct |
4 ms |
24924 KB |
Output is correct |
11 |
Correct |
4 ms |
24924 KB |
Output is correct |
12 |
Correct |
4 ms |
24924 KB |
Output is correct |
13 |
Correct |
4 ms |
24924 KB |
Output is correct |
14 |
Correct |
4 ms |
24924 KB |
Output is correct |
15 |
Correct |
84 ms |
31448 KB |
Output is correct |
16 |
Correct |
84 ms |
31808 KB |
Output is correct |
17 |
Correct |
85 ms |
31948 KB |
Output is correct |
18 |
Correct |
13 ms |
32728 KB |
Output is correct |
19 |
Correct |
12 ms |
30424 KB |
Output is correct |
20 |
Correct |
95 ms |
31812 KB |
Output is correct |
21 |
Correct |
98 ms |
31700 KB |
Output is correct |
22 |
Correct |
4 ms |
24924 KB |
Output is correct |
23 |
Correct |
12 ms |
32308 KB |
Output is correct |
24 |
Correct |
12 ms |
32244 KB |
Output is correct |
25 |
Correct |
4 ms |
24924 KB |
Output is correct |
26 |
Correct |
4 ms |
24924 KB |
Output is correct |
27 |
Correct |
12 ms |
30936 KB |
Output is correct |
28 |
Correct |
11 ms |
30420 KB |
Output is correct |
29 |
Correct |
11 ms |
30424 KB |
Output is correct |
30 |
Correct |
11 ms |
30420 KB |
Output is correct |
31 |
Correct |
4 ms |
24924 KB |
Output is correct |
32 |
Correct |
4 ms |
24924 KB |
Output is correct |
33 |
Correct |
4 ms |
24924 KB |
Output is correct |
34 |
Correct |
4 ms |
24924 KB |
Output is correct |
35 |
Correct |
4 ms |
24924 KB |
Output is correct |
36 |
Correct |
194 ms |
64708 KB |
Output is correct |
37 |
Correct |
4 ms |
24924 KB |
Output is correct |
38 |
Correct |
189 ms |
65216 KB |
Output is correct |
39 |
Correct |
181 ms |
63932 KB |
Output is correct |
40 |
Correct |
202 ms |
65508 KB |
Output is correct |
41 |
Correct |
191 ms |
66876 KB |
Output is correct |
42 |
Correct |
170 ms |
58116 KB |
Output is correct |
43 |
Correct |
206 ms |
54904 KB |
Output is correct |
44 |
Correct |
237 ms |
54852 KB |
Output is correct |
45 |
Correct |
295 ms |
55124 KB |
Output is correct |
46 |
Correct |
270 ms |
55368 KB |
Output is correct |
47 |
Correct |
177 ms |
59584 KB |
Output is correct |
48 |
Correct |
169 ms |
59096 KB |
Output is correct |
49 |
Correct |
198 ms |
60036 KB |
Output is correct |
50 |
Correct |
208 ms |
60796 KB |
Output is correct |
51 |
Correct |
183 ms |
66048 KB |
Output is correct |
52 |
Correct |
173 ms |
65928 KB |
Output is correct |
53 |
Correct |
174 ms |
55740 KB |
Output is correct |
54 |
Correct |
169 ms |
55652 KB |
Output is correct |
55 |
Correct |
241 ms |
55892 KB |
Output is correct |
56 |
Correct |
239 ms |
56132 KB |
Output is correct |
57 |
Correct |
291 ms |
56396 KB |
Output is correct |
58 |
Correct |
277 ms |
55588 KB |
Output is correct |
59 |
Correct |
282 ms |
55836 KB |
Output is correct |
60 |
Correct |
204 ms |
55492 KB |
Output is correct |
61 |
Correct |
174 ms |
60292 KB |
Output is correct |
62 |
Correct |
183 ms |
61108 KB |
Output is correct |
63 |
Correct |
176 ms |
60356 KB |
Output is correct |
64 |
Correct |
188 ms |
61328 KB |
Output is correct |
65 |
Correct |
348 ms |
57420 KB |
Output is correct |
66 |
Correct |
331 ms |
56856 KB |
Output is correct |
67 |
Correct |
277 ms |
56868 KB |
Output is correct |
68 |
Correct |
134 ms |
55204 KB |
Output is correct |
69 |
Correct |
133 ms |
55364 KB |
Output is correct |
70 |
Correct |
196 ms |
62016 KB |
Output is correct |
71 |
Correct |
193 ms |
60416 KB |
Output is correct |
72 |
Correct |
4 ms |
24920 KB |
Output is correct |
73 |
Correct |
11 ms |
32216 KB |
Output is correct |
74 |
Correct |
11 ms |
30424 KB |
Output is correct |
75 |
Correct |
4 ms |
24924 KB |
Output is correct |
76 |
Correct |
4 ms |
25016 KB |
Output is correct |
77 |
Correct |
12 ms |
30780 KB |
Output is correct |
78 |
Correct |
11 ms |
30424 KB |
Output is correct |
79 |
Correct |
10 ms |
30168 KB |
Output is correct |
80 |
Correct |
11 ms |
30424 KB |
Output is correct |
81 |
Correct |
4 ms |
24924 KB |
Output is correct |
82 |
Correct |
4 ms |
24920 KB |
Output is correct |
83 |
Correct |
4 ms |
24924 KB |
Output is correct |
84 |
Correct |
4 ms |
25064 KB |
Output is correct |
85 |
Correct |
4 ms |
24924 KB |
Output is correct |
86 |
Correct |
84 ms |
31704 KB |
Output is correct |
87 |
Correct |
84 ms |
31804 KB |
Output is correct |
88 |
Correct |
84 ms |
31804 KB |
Output is correct |
89 |
Correct |
15 ms |
31032 KB |
Output is correct |
90 |
Correct |
12 ms |
30424 KB |
Output is correct |
91 |
Correct |
101 ms |
31832 KB |
Output is correct |
92 |
Correct |
99 ms |
31700 KB |
Output is correct |
93 |
Correct |
4 ms |
24924 KB |
Output is correct |
94 |
Correct |
195 ms |
66524 KB |
Output is correct |
95 |
Correct |
186 ms |
65472 KB |
Output is correct |
96 |
Correct |
190 ms |
64296 KB |
Output is correct |
97 |
Correct |
200 ms |
66240 KB |
Output is correct |
98 |
Correct |
190 ms |
66748 KB |
Output is correct |
99 |
Correct |
313 ms |
55892 KB |
Output is correct |
100 |
Correct |
289 ms |
55636 KB |
Output is correct |
101 |
Correct |
332 ms |
56132 KB |
Output is correct |
102 |
Correct |
217 ms |
55668 KB |
Output is correct |
103 |
Correct |
169 ms |
59364 KB |
Output is correct |
104 |
Correct |
178 ms |
60812 KB |
Output is correct |
105 |
Correct |
174 ms |
59584 KB |
Output is correct |
106 |
Correct |
193 ms |
60860 KB |
Output is correct |
107 |
Correct |
188 ms |
60768 KB |
Output is correct |
108 |
Correct |
178 ms |
66044 KB |
Output is correct |
109 |
Correct |
169 ms |
65984 KB |
Output is correct |
110 |
Correct |
172 ms |
55720 KB |
Output is correct |
111 |
Correct |
167 ms |
55740 KB |
Output is correct |
112 |
Correct |
243 ms |
55784 KB |
Output is correct |
113 |
Correct |
239 ms |
55836 KB |
Output is correct |