#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], dp[MAXR], root[BLOCK][MAXR], child[BLOCK][MAXR];
vector<int> G[MAXN], R[MAXR], pos[MAXR], S;
bitset<MAXN> is_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 (int region : S)
++root[ind[region]][r[u]];
if (is_large[r[u]]) {
for (int i = 0; i < m; ++i)
child[ind[r[u]]][i] += dp[i];
S.emplace_back(r[u]);
}
++dp[r[u]];
for (int v : G[u])
dfs2(v);
if (is_large[r[u]])
S.pop_back();
--dp[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 if ((int)R[r2].size() > BLOCK)
cout << child[ind[r2]][r1] << '\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 |
6 ms |
6088 KB |
Output is correct |
2 |
Correct |
5 ms |
6088 KB |
Output is correct |
3 |
Correct |
9 ms |
6088 KB |
Output is correct |
4 |
Correct |
10 ms |
6216 KB |
Output is correct |
5 |
Correct |
17 ms |
6216 KB |
Output is correct |
6 |
Correct |
29 ms |
6304 KB |
Output is correct |
7 |
Correct |
49 ms |
6436 KB |
Output is correct |
8 |
Correct |
38 ms |
6460 KB |
Output is correct |
9 |
Correct |
88 ms |
7036 KB |
Output is correct |
10 |
Correct |
145 ms |
7136 KB |
Output is correct |
11 |
Correct |
199 ms |
7492 KB |
Output is correct |
12 |
Correct |
192 ms |
8412 KB |
Output is correct |
13 |
Correct |
299 ms |
7892 KB |
Output is correct |
14 |
Correct |
302 ms |
8728 KB |
Output is correct |
15 |
Correct |
363 ms |
12036 KB |
Output is correct |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
3082 ms |
12796 KB |
Output is correct |
2 |
Correct |
2044 ms |
11240 KB |
Output is correct |
3 |
Correct |
7627 ms |
17268 KB |
Output is correct |
4 |
Correct |
488 ms |
9580 KB |
Output is correct |
5 |
Correct |
451 ms |
11992 KB |
Output is correct |
6 |
Correct |
1474 ms |
14724 KB |
Output is correct |
7 |
Correct |
1212 ms |
12568 KB |
Output is correct |
8 |
Execution timed out |
8070 ms |
24620 KB |
Time limit exceeded |
9 |
Correct |
3333 ms |
24308 KB |
Output is correct |
10 |
Execution timed out |
8036 ms |
33732 KB |
Time limit exceeded |
11 |
Correct |
6650 ms |
27580 KB |
Output is correct |
12 |
Correct |
2712 ms |
19712 KB |
Output is correct |
13 |
Correct |
5059 ms |
21816 KB |
Output is correct |
14 |
Correct |
5503 ms |
24964 KB |
Output is correct |
15 |
Execution timed out |
8082 ms |
22828 KB |
Time limit exceeded |
16 |
Execution timed out |
8042 ms |
25880 KB |
Time limit exceeded |
17 |
Execution timed out |
8066 ms |
27060 KB |
Time limit exceeded |