#include <bits/stdc++.h>
using namespace std;
const int MAXN = 2e5;
const int MAXR = 25 * 1e3;
const int BLOCK = 450;
int r[MAXN], timer, in[MAXN], out[MAXN], cnt_large, ind[MAXR], root[BLOCK][MAXR];
vector<int> G[MAXN], R[MAXR], pos[MAXR];
bitset<MAXN> is_large;
map<int,int> large;
void dfs1(int u) {
in[u] = ++timer;
pos[r[u]].emplace_back(in[u]);
for (int v : G[u])
dfs1(v);
out[u] = timer;
}
void dfs2(int u) {
for (auto it : large)
root[it.first][r[u]] += it.second;
if (is_large[r[u]])
++large[ind[r[u]]];
for (int v : G[u])
dfs2(v);
if (is_large[r[u]])
--large[ind[r[u]]];
}
int solve(int r1, int r2) {
int ans = 0;
for (int u : R[r1]) {
int n = pos[r2].size();
int st = n, dr = n, l = 0, r = n - 1;
while (l <= r) {
int mid = (l + r) >> 1;
if (in[u] <= pos[r2][mid]) {
st = mid;
r = mid - 1;
} else l = mid + 1;
}
l = 0, r = n - 1;
while (l <= r) {
int mid = (l + r) >> 1;
if (out[u] < pos[r2][mid]) {
dr = mid;
r = mid - 1;
} else l = mid + 1;
}
ans += dr - st;
}
return ans;
}
int main() {
int n, m, Q;
cin >> n >> m >> Q;
for (int v = 0; v < n; ++v) {
if (v == 0) {
cin >> r[0];
--r[0];
R[r[0]].emplace_back(0);
continue;
}
int u;
cin >> u >> r[v];
--r[v];
G[u - 1].emplace_back(v);
R[r[v]].emplace_back(v);
}
dfs1(0);
for (int i = 0; i < m; ++i)
if ((int)R[i].size() > BLOCK) {
is_large[i] = true;
ind[i] = cnt_large++;
}
dfs2(0);
for (int q = 0; q < Q; ++q) {
int r1, r2;
cin >> r1 >> r2;
--r1, --r2;
if ((int)R[r1].size() > BLOCK)
cout << root[ind[r1]][r2] << '\n';
else cout << solve(r1, r2) << '\n';
cout.flush();
}
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
5 ms |
6088 KB |
Output is correct |
2 |
Correct |
6 ms |
6088 KB |
Output is correct |
3 |
Correct |
7 ms |
6088 KB |
Output is correct |
4 |
Correct |
12 ms |
6088 KB |
Output is correct |
5 |
Correct |
14 ms |
6216 KB |
Output is correct |
6 |
Correct |
21 ms |
6216 KB |
Output is correct |
7 |
Correct |
43 ms |
6216 KB |
Output is correct |
8 |
Correct |
40 ms |
6216 KB |
Output is correct |
9 |
Correct |
79 ms |
6908 KB |
Output is correct |
10 |
Correct |
110 ms |
6728 KB |
Output is correct |
11 |
Correct |
196 ms |
6984 KB |
Output is correct |
12 |
Correct |
196 ms |
7624 KB |
Output is correct |
13 |
Correct |
267 ms |
7292 KB |
Output is correct |
14 |
Correct |
354 ms |
7744 KB |
Output is correct |
15 |
Correct |
329 ms |
12096 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
2213 ms |
11584 KB |
Output is correct |
2 |
Correct |
2797 ms |
9792 KB |
Output is correct |
3 |
Correct |
3606 ms |
14272 KB |
Output is correct |
4 |
Correct |
321 ms |
7880 KB |
Output is correct |
5 |
Correct |
465 ms |
10604 KB |
Output is correct |
6 |
Correct |
865 ms |
11192 KB |
Output is correct |
7 |
Correct |
2129 ms |
10840 KB |
Output is correct |
8 |
Correct |
1314 ms |
22680 KB |
Output is correct |
9 |
Correct |
2827 ms |
16448 KB |
Output is correct |
10 |
Correct |
4442 ms |
29888 KB |
Output is correct |
11 |
Correct |
5888 ms |
15608 KB |
Output is correct |
12 |
Correct |
1933 ms |
17188 KB |
Output is correct |
13 |
Correct |
2366 ms |
17984 KB |
Output is correct |
14 |
Correct |
2503 ms |
19108 KB |
Output is correct |
15 |
Correct |
4256 ms |
24736 KB |
Output is correct |
16 |
Correct |
3465 ms |
35764 KB |
Output is correct |
17 |
Correct |
3894 ms |
34948 KB |
Output is correct |