#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int n, q;
vector<int> adj[808080];
int par[808080], ch[808080];
void get_par(int v, int p) {
par[v] = p;
for (int i = 0; i < adj[v].size(); i++) {
int next = adj[v][i];
if (ch[next]) continue;
ch[next] = 1;
get_par(next, v);
}
}
vector<int> child[808080];
int order[2020202], visit[808080];
vector<int> upds[808080];
int r = -1;
void get_euler(int v) {
order[++r] = v;
upds[visit[v]].push_back(r);
int f = 1;
if (v == 1 || adj[v][0] == par[v]) f = 0;
for (int i = 0; i < child[v].size(); i++) {
int next = child[v][i];
visit[next] = visit[v] + f;
get_euler(next);
order[++r] = v;
upds[visit[next]].push_back(r);
if (next == adj[v][0]) f = 0;
}
}
pair<ll, int> query[808080];
int ans[808080];
int tree[8080808];
void update(int v, int st, int ed, int idx, int val) {
if (st == idx && ed == idx) {
tree[v] += val;
return;
}
if (idx < st || idx > ed) return;
int mid = (st + ed) / 2;
update(2 * v, st, mid, idx, val);
update(2 * v + 1, mid + 1, ed, idx, val);
tree[v] = tree[2 * v] + tree[2 * v + 1];
}
int get(int v, int st, int ed, int cnt) {
if (st == ed) return st;
int mid = (st + ed) / 2;
if (tree[2 * v] >= cnt) return get(2 * v, st, mid, cnt);
else return get(2 * v + 1, mid + 1, ed, cnt - tree[2 * v]);
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cin >> n >> q;
for (int i = 1; i <= n; i++) {
int c, v;
cin >> c;
for (int j = 1; j <= c; j++) {
cin >> v;
adj[i].push_back(v);
}
}
ch[1] = 1;
get_par(1, 0);
for (int j = 0; j < adj[1].size(); j++) {
child[1].push_back(adj[1][j]);
}
for (int i = 2; i <= n; i++) {
int k = 0;
for (int j = 0; j < adj[i].size(); j++) {
if (adj[i][j] == par[i]) {
k = j;
break;
}
}
for (int j = k + 1; j < adj[i].size(); j++) child[i].push_back(adj[i][j]);
for (int j = 0; j < k; j++) child[i].push_back(adj[i][j]);
}
visit[1] = 1;
get_euler(1);
for (int i = 1; i <= q; i++) {
cin >> query[i].first;
query[i].second = i;
}
sort(query + 1, query + q + 1);
int p = 1; ll k = 0, sum = 0;
for (int i = 1; i <= n; i++) {
for (int j = 0; j < upds[i].size(); j++) {
update(1, 1, 2*n-2, upds[i][j], 1);
if (upds[i][j] > 0) sum += 1;
}
while (p <= q && query[p].first <= k + sum) {
ans[query[p].second] = get(1, 1, 2*n-2, query[p].first - k);
p++;
}
k += sum;
}
for (int i = p; i <= q; i++) {
ans[query[i].second] = get(1, 1, 2*n-2, (query[i].first - k - 1) % sum + 1);
}
for (int i = 1; i <= q; i++) cout << order[ans[i]] << "\n";
return 0;
}
Compilation message
Main.cpp: In function 'void get_par(int, int)':
Main.cpp:11:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
11 | for (int i = 0; i < adj[v].size(); i++) {
| ~~^~~~~~~~~~~~~~~
Main.cpp: In function 'void get_euler(int)':
Main.cpp:29:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
29 | for (int i = 0; i < child[v].size(); i++) {
| ~~^~~~~~~~~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:79:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
79 | for (int j = 0; j < adj[1].size(); j++) {
| ~~^~~~~~~~~~~~~~~
Main.cpp:84:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
84 | for (int j = 0; j < adj[i].size(); j++) {
| ~~^~~~~~~~~~~~~~~
Main.cpp:90:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
90 | for (int j = k + 1; j < adj[i].size(); j++) child[i].push_back(adj[i][j]);
| ~~^~~~~~~~~~~~~~~
Main.cpp:106:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
106 | for (int j = 0; j < upds[i].size(); j++) {
| ~~^~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
24 ms |
57196 KB |
Output is correct |
| 2 |
Correct |
36 ms |
59780 KB |
Output is correct |
| 3 |
Correct |
123 ms |
82368 KB |
Output is correct |
| 4 |
Correct |
847 ms |
248196 KB |
Output is correct |
| 5 |
Correct |
987 ms |
270556 KB |
Output is correct |
| 6 |
Correct |
981 ms |
262088 KB |
Output is correct |
| 7 |
Correct |
327 ms |
102988 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
31 ms |
57292 KB |
Output is correct |
| 2 |
Correct |
32 ms |
57348 KB |
Output is correct |
| 3 |
Correct |
31 ms |
57432 KB |
Output is correct |
| 4 |
Correct |
35 ms |
57544 KB |
Output is correct |
| 5 |
Correct |
28 ms |
57488 KB |
Output is correct |
| 6 |
Correct |
30 ms |
57556 KB |
Output is correct |
| 7 |
Incorrect |
32 ms |
57700 KB |
Output isn't correct |
| 8 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
34 ms |
58700 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
24 ms |
57196 KB |
Output is correct |
| 2 |
Correct |
36 ms |
59780 KB |
Output is correct |
| 3 |
Correct |
123 ms |
82368 KB |
Output is correct |
| 4 |
Correct |
847 ms |
248196 KB |
Output is correct |
| 5 |
Correct |
987 ms |
270556 KB |
Output is correct |
| 6 |
Correct |
981 ms |
262088 KB |
Output is correct |
| 7 |
Correct |
327 ms |
102988 KB |
Output is correct |
| 8 |
Correct |
31 ms |
57292 KB |
Output is correct |
| 9 |
Correct |
32 ms |
57348 KB |
Output is correct |
| 10 |
Correct |
31 ms |
57432 KB |
Output is correct |
| 11 |
Correct |
35 ms |
57544 KB |
Output is correct |
| 12 |
Correct |
28 ms |
57488 KB |
Output is correct |
| 13 |
Correct |
30 ms |
57556 KB |
Output is correct |
| 14 |
Incorrect |
32 ms |
57700 KB |
Output isn't correct |
| 15 |
Halted |
0 ms |
0 KB |
- |
