#include <bits/stdc++.h>
using namespace std;
#ifdef ONLINE_JUDGE
#include "debug.h"
#else
#pragma GCC optimize("O3")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define dbg(...) 42
template<typename T>ostream&operator<<(ostream&os,vector<T>&vec){for(signed i=0;i+1<vec.size();++i){os<<vec[i]<<" ";}if(vec.size()>0)os<<vec.back();return os;}
#endif
const int N = 2e5 + 6;
const int R = 25001;
int n;
int col[N];
int tin[N], tout[N];
vector<int> tree[N], tour;
void build_tour(int v, int p=-1) {
tour.push_back(v);
tin[v] = tour.size() - 1;
for (int u : tree[v]) if (u != p) {
build_tour(u, v);
}
tout[v] = tour.size() - 1;
}
vector<pair<int, int>> seg[2 * N];
int get_node_count(const vector<pair<int, int>>& node, const int& element) {
auto it = lower_bound(node.begin(), node.end(), make_pair(element, -1));
if (it == node.end() || it->first != element) return 0;
return it->second;
}
void combine(vector<pair<int, int>>& dest, const vector<pair<int, int>>& v1, const vector<pair<int, int>>& v2) {
int p1 = 0, p2 = 0;
while (p1 < v1.size() && p2 < v2.size()) {
if (v1[p1].first < v2[p2].first) dest.push_back(v1[p1++]);
else if (v2[p2].first < v1[p1].first) dest.push_back(v2[p2++]);
else if (v1[p1].first == v2[p2].first) dest.emplace_back(v1[p1].first, v1[p1].second + v2[p2].second), ++p1, ++p2;
}
while (p1 < v1.size()) dest.push_back(v1[p1++]);
while (p2 < v2.size()) dest.push_back(v2[p2++]);
}
void build() {
for (int i = 0; i < n; ++i) {
seg[n + i].push_back({col[tour[i]], 1});
}
for (int i = n - 1; i > 0; --i) {
combine(seg[i], seg[i << 1], seg[i << 1 | 1]);
}
}
const int BLOCK = 160;
int cnt[N / BLOCK][R] = {};
vector<int> comp[R];
int bigindex[N] = {};
signed main(void) {
cin.tie(0)->sync_with_stdio(false);
int r, q;
cin >> n >> r >> q;
cin >> col[1];
--col[1];
comp[col[1]].push_back(1);
for (int i = 2; i <= n; ++i) {
int p;
cin >> p >> col[i];
--col[i];
comp[col[i]].push_back(i);
tree[p].push_back(i);
tree[i].push_back(p);
}
build_tour(1);
build();
int index = 0;
for (int i = 0; i < r; ++i) {
if (comp[i].size() >= BLOCK) {
int cnt_now = 0;
bigindex[i] = index;
function<void(int, int)> dfs = [&] (int v, int p) -> void {
if (col[v] == i) ++cnt_now;
else cnt[index][col[v]] += cnt_now;
for (int u : tree[v]) if (u != p) {
dfs(u, v);
}
if (col[v] == i) --cnt_now;
};
dfs(1, 1);
++index;
}
}
while (q--) {
int a, b;
cin >> a >> b;
--a, --b;
if (comp[a].size() >= BLOCK) {
cout << cnt[bigindex[a]][b] << endl;
continue;
}
int ans = 0;
for (int v : comp[a]) {
int tl = tin[v] + n, tr = tout[v] + n + 1;
for (; tl < tr; tl >>= 1, tr >>= 1) {
if (tl&1) ans += get_node_count(seg[tl], b), ++tl;
if (tr&1) --tr, ans += get_node_count(seg[tr], b);
}
}
cout << ans << endl;
}
}
Compilation message
regions.cpp: In function 'void combine(std::vector<std::pair<int, int> >&, const std::vector<std::pair<int, int> >&, const std::vector<std::pair<int, int> >&)':
regions.cpp:35:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
35 | while (p1 < v1.size() && p2 < v2.size()) {
| ~~~^~~~~~~~~~~
regions.cpp:35:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
35 | while (p1 < v1.size() && p2 < v2.size()) {
| ~~~^~~~~~~~~~~
regions.cpp:40:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
40 | while (p1 < v1.size()) dest.push_back(v1[p1++]);
| ~~~^~~~~~~~~~~
regions.cpp:41:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
41 | while (p2 < v2.size()) dest.push_back(v2[p2++]);
| ~~~^~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
4 ms |
18776 KB |
Output is correct |
| 2 |
Correct |
4 ms |
18776 KB |
Output is correct |
| 3 |
Correct |
5 ms |
18776 KB |
Output is correct |
| 4 |
Correct |
5 ms |
18776 KB |
Output is correct |
| 5 |
Correct |
8 ms |
18776 KB |
Output is correct |
| 6 |
Correct |
13 ms |
19032 KB |
Output is correct |
| 7 |
Correct |
18 ms |
19168 KB |
Output is correct |
| 8 |
Correct |
22 ms |
19032 KB |
Output is correct |
| 9 |
Correct |
56 ms |
19988 KB |
Output is correct |
| 10 |
Correct |
82 ms |
20596 KB |
Output is correct |
| 11 |
Correct |
154 ms |
21376 KB |
Output is correct |
| 12 |
Correct |
280 ms |
22476 KB |
Output is correct |
| 13 |
Correct |
151 ms |
22944 KB |
Output is correct |
| 14 |
Correct |
296 ms |
27844 KB |
Output is correct |
| 15 |
Correct |
451 ms |
45460 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
727 ms |
52176 KB |
Output is correct |
| 2 |
Correct |
786 ms |
47712 KB |
Output is correct |
| 3 |
Correct |
1031 ms |
60780 KB |
Output is correct |
| 4 |
Correct |
366 ms |
26640 KB |
Output is correct |
| 5 |
Correct |
810 ms |
26780 KB |
Output is correct |
| 6 |
Correct |
451 ms |
34996 KB |
Output is correct |
| 7 |
Correct |
1208 ms |
41076 KB |
Output is correct |
| 8 |
Correct |
2793 ms |
53660 KB |
Output is correct |
| 9 |
Correct |
5437 ms |
61528 KB |
Output is correct |
| 10 |
Correct |
3185 ms |
118816 KB |
Output is correct |
| 11 |
Correct |
4640 ms |
117244 KB |
Output is correct |
| 12 |
Correct |
4962 ms |
114044 KB |
Output is correct |
| 13 |
Correct |
4541 ms |
115752 KB |
Output is correct |
| 14 |
Correct |
5284 ms |
108712 KB |
Output is correct |
| 15 |
Correct |
4979 ms |
123992 KB |
Output is correct |
| 16 |
Correct |
3914 ms |
124472 KB |
Output is correct |
| 17 |
Correct |
4032 ms |
123428 KB |
Output is correct |
