#include <bits/stdc++.h>
using namespace std;
const int MAXN = 2e5;
const int MAXR = 25 * 1e3;
const int BLOCK = 450;
int m, 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, 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);
map<pair<int,int>,int> sol;
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 {
pair<int,int> p{r1, r2};
auto it = sol.find(p);
if (it != sol.end())
cout << it->second << '\n';
else {
int ans = solve(r1, r2);
sol[p] = ans;
cout << ans << '\n';
}
}
cout.flush();
}
return 0;
}
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
7 ms |
6088 KB |
Output is correct |
2 |
Correct |
4 ms |
6088 KB |
Output is correct |
3 |
Correct |
6 ms |
6088 KB |
Output is correct |
4 |
Correct |
11 ms |
6216 KB |
Output is correct |
5 |
Correct |
13 ms |
6216 KB |
Output is correct |
6 |
Correct |
22 ms |
6380 KB |
Output is correct |
7 |
Correct |
38 ms |
6404 KB |
Output is correct |
8 |
Correct |
38 ms |
6464 KB |
Output is correct |
9 |
Correct |
64 ms |
7104 KB |
Output is correct |
10 |
Correct |
141 ms |
7084 KB |
Output is correct |
11 |
Correct |
185 ms |
7488 KB |
Output is correct |
12 |
Correct |
179 ms |
8336 KB |
Output is correct |
13 |
Correct |
247 ms |
7900 KB |
Output is correct |
14 |
Correct |
402 ms |
8540 KB |
Output is correct |
15 |
Correct |
409 ms |
13052 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
1472 ms |
13088 KB |
Output is correct |
2 |
Correct |
1783 ms |
11420 KB |
Output is correct |
3 |
Correct |
2293 ms |
18376 KB |
Output is correct |
4 |
Correct |
314 ms |
9376 KB |
Output is correct |
5 |
Correct |
325 ms |
12672 KB |
Output is correct |
6 |
Correct |
585 ms |
13168 KB |
Output is correct |
7 |
Correct |
1273 ms |
12360 KB |
Output is correct |
8 |
Correct |
1452 ms |
25528 KB |
Output is correct |
9 |
Correct |
3020 ms |
24716 KB |
Output is correct |
10 |
Correct |
4431 ms |
38020 KB |
Output is correct |
11 |
Correct |
5693 ms |
27460 KB |
Output is correct |
12 |
Correct |
1749 ms |
20928 KB |
Output is correct |
13 |
Correct |
2312 ms |
23628 KB |
Output is correct |
14 |
Correct |
3589 ms |
25488 KB |
Output is correct |
15 |
Correct |
4370 ms |
34044 KB |
Output is correct |
16 |
Correct |
4156 ms |
44784 KB |
Output is correct |
17 |
Correct |
4146 ms |
43820 KB |
Output is correct |