#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<class T> using oset =
tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define ll long long
#define ld long double
#define ar array
#define vi vector<int>
#define vii vector<vector<int>>
#define pii pair<int, int>
#define pb push_back
#define all(x) x.begin(), x.end()
#define f first
#define s second
#define endl "\n"
const int MOD = 1e9+7;
const int inf = 1e9;
const ll linf = 1e18;
const int d4i[4]={-1, 0, 1, 0}, d4j[4]={0, 1, 0, -1};
const int d8i[8]={-1, -1, 0, 1, 1, 1, 0, -1}, d8j[8]={0, 1, 1, 1, 0, -1, -1, -1};
// -------------------------------------------------- Main Code --------------------------------------------------
const int N = 2e5+5;
vi g[N], members[N];
int region[N], tin[N], tout[N], tarr[8*N], timer = 1;
struct segTree {
int n;
vector<unordered_map<int, int>> tree;
segTree (int N) {n = 1; while (n < N) n *= 2; tree = vector<unordered_map<int, int>>(2*n+2);}
void build(int node, int left, int right, int arr[]) {
if (left == right) {if (arr[left] != -1) tree[node][arr[left]]++; return;}
build(node*2, left, (left+right)/2, arr);
build(node*2+1, (left+right)/2+1, right, arr);
for (auto i : tree[node*2]) tree[node][i.f] += i.s;
for (auto i : tree[node*2+1]) tree[node][i.f] += i.s;
}
void build(int arr[]) {build(1, 1, n, arr);}
int query(int node, int left, int right, int l, int r, int val) {
if (left > r || right < l) return 0;
else if (left >= l && right <= r) return tree[node][val];
else return query(node*2, left, (left+right)/2, l, r, val) + query(node*2+1, (left+right)/2+1, right, l, r, val);
}
int query(int left, int right, int val) {return query(1, 1, n, left, right, val);}
};
void dfs(int src, int par) {
tarr[timer] = region[src];
tin[src] = timer++;
for (auto ch : g[src]) if (ch != par) dfs(ch, src);
tout[src] = timer-1;
}
vi largeregions;
vii preProcessing;
void dfs2(int src, int par, int i, int ct = 0) {
for (auto ch : g[src]) {
if (ch == par) continue;
preProcessing[i][region[ch]] += ct;
dfs2(ch, src, i, ct+(largeregions[i]==region[ch]));
}
}
void sol() {
int n, r, q; cin >> n >> r >> q;
int sqn = sqrt(n)+1;
for (int i = 1; i <= n; i++) {
if (i == 1) cin >> region[i];
else {
int x; cin >> x >> region[i];
g[i].pb(x);
g[x].pb(i);
}
members[region[i]].pb(i);
}
dfs(1, -1);
segTree tree(n); tree.build(tarr);
for (int i = 1; i <= r; i++) if (members[i].size() >= sqn) largeregions.pb(i);
preProcessing = vii(largeregions.size(), vi(r+1, 0));
for (int i = 0; i < largeregions.size(); i++) dfs2(1, -1, i, (largeregions[i]==region[1]));
while (q--) {
int a, b; cin >> a >> b;
int idx = lower_bound(all(largeregions), a) - largeregions.begin();
if (idx < largeregions.size() && largeregions[idx] == a) {
cout << preProcessing[idx][b] << endl;
continue;
}
int ans = 0;
for (auto ch : members[a]) {
// ans += tree.query(tin[ch], tout[ch], b);
}
cout << ans << endl;
}
}
int main () {
// ios_base::sync_with_stdio(false);
// cin.tie(NULL);
int t = 1;
// cin >> t;
while (t--) {
sol();
}
return 0;
}
Compilation message
regions.cpp: In function 'void sol()':
regions.cpp:93:56: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
93 | for (int i = 1; i <= r; i++) if (members[i].size() >= sqn) largeregions.pb(i);
| ~~~~~~~~~~~~~~~~~~^~~~~~
regions.cpp:95:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
95 | for (int i = 0; i < largeregions.size(); i++) dfs2(1, -1, i, (largeregions[i]==region[1]));
| ~~^~~~~~~~~~~~~~~~~~~~~
regions.cpp:100:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
100 | if (idx < largeregions.size() && largeregions[idx] == a) {
| ~~~~^~~~~~~~~~~~~~~~~~~~~
regions.cpp:106:19: warning: unused variable 'ch' [-Wunused-variable]
106 | for (auto ch : members[a]) {
| ^~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
9680 KB |
Output is correct |
| 2 |
Incorrect |
6 ms |
9680 KB |
Output isn't correct |
| 3 |
Incorrect |
5 ms |
9680 KB |
Output isn't correct |
| 4 |
Incorrect |
10 ms |
9808 KB |
Output isn't correct |
| 5 |
Incorrect |
14 ms |
10064 KB |
Output isn't correct |
| 6 |
Incorrect |
25 ms |
10320 KB |
Output isn't correct |
| 7 |
Incorrect |
37 ms |
10960 KB |
Output isn't correct |
| 8 |
Incorrect |
36 ms |
11088 KB |
Output isn't correct |
| 9 |
Incorrect |
55 ms |
14800 KB |
Output isn't correct |
| 10 |
Incorrect |
99 ms |
19652 KB |
Output isn't correct |
| 11 |
Incorrect |
116 ms |
21048 KB |
Output isn't correct |
| 12 |
Incorrect |
149 ms |
29956 KB |
Output isn't correct |
| 13 |
Incorrect |
184 ms |
30792 KB |
Output isn't correct |
| 14 |
Incorrect |
201 ms |
31844 KB |
Output isn't correct |
| 15 |
Incorrect |
238 ms |
51920 KB |
Output isn't correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
814 ms |
80932 KB |
Output isn't correct |
| 2 |
Incorrect |
918 ms |
81096 KB |
Output isn't correct |
| 3 |
Incorrect |
1286 ms |
88620 KB |
Output isn't correct |
| 4 |
Incorrect |
244 ms |
34996 KB |
Output isn't correct |
| 5 |
Incorrect |
319 ms |
52228 KB |
Output isn't correct |
| 6 |
Incorrect |
598 ms |
58248 KB |
Output isn't correct |
| 7 |
Incorrect |
1030 ms |
97084 KB |
Output isn't correct |
| 8 |
Incorrect |
1297 ms |
112292 KB |
Output isn't correct |
| 9 |
Runtime error |
248 ms |
131072 KB |
Execution killed with signal 9 |
| 10 |
Runtime error |
246 ms |
131072 KB |
Execution killed with signal 9 |
| 11 |
Runtime error |
284 ms |
131072 KB |
Execution killed with signal 9 |
| 12 |
Runtime error |
296 ms |
131072 KB |
Execution killed with signal 9 |
| 13 |
Runtime error |
262 ms |
131072 KB |
Execution killed with signal 9 |
| 14 |
Runtime error |
279 ms |
131072 KB |
Execution killed with signal 9 |
| 15 |
Runtime error |
262 ms |
131072 KB |
Execution killed with signal 9 |
| 16 |
Runtime error |
254 ms |
131072 KB |
Execution killed with signal 9 |
| 17 |
Runtime error |
255 ms |
131072 KB |
Execution killed with signal 9 |
