#include<bits/stdc++.h>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef double db;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define pbds tree<int, null_type, less<int>,rb_tree_tag, tree_order_statistics_node_update>
using namespace __gnu_pbds;
ll gcd(ll a , ll b) {return b ? gcd(b , a % b) : a ;} // greatest common divisor (PGCD)
ll lcm(ll a , ll b) {return (a * b) / gcd(a , b);} // least common multiple (PPCM)
int dx[8] = {1, 0, 0, -1, 1, 1, -1, -1};
int dy[8] = {0, 1, -1, 0, 1, -1, -1, 1};
#define endl "\n"
#define ss second
#define ff first
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define vl vector<ll>
#define vll vector<pair<ll,ll>>
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pdd pair<double,double>
#define vdd vector<pdd>
#define speed ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
////////////////////Only Clear Code//////////////////////////
void usaco_problem(){
freopen("milkvisits.in", "r", stdin);
freopen("milkvisits.out", "w", stdout);
}
void init(){
#ifndef ONLINE_JUDGE
freopen("input.txt", "r", stdin);
freopen("output.txt", "w", stdout);
#endif // ONLINE_JUDGE
}
const int mx = 2e5+5;
const int LOG = 22;
const int inf = 1e9;
const ll mod = 998244353;
const int sq = 320;
int arr[mx];
vi graph[mx];
int tin[mx], tout[mx];
int c = 0;
void dfs(int node, int p){
tin[node] = c++;
for(int adj : graph[node]){
if(adj == p)continue;
dfs(adj, node);
}
tout[node] = c++;
}
vi vect[mx];
vi nodes[mx];
int32_t main(){
int n, r, q;cin >> n >> r >> q;
for(int i = 1; i <= n;i++){
if(i > 1){
int a;cin >> a;
graph[a].pb(i);
}
cin >> arr[i];
}
dfs(1, 1);
for(int i = 1; i <= n;i++){
vect[arr[i]].pb(tin[i]);
nodes[arr[i]].pb(i);
}
for(int i = 1; i <= r;i++){
sort(all(vect[i]));
}
map<pii, int > pre;
for(int i = 1; i <= r;i++){
if(vect[i].size() >= sq){
for(int b = 1; b <= r;b++){
int ans = 0;
for(int x : nodes[i]){
int l = lower_bound(all(vect[b]), tin[x]) - vect[b].begin();
int r = lower_bound(all(vect[b]), tout[x]) - vect[b].begin();
ans += r-l;
}
pre[{i, b}] = ans;
}
}
}
while(q--){
int a, b;cin >> a >> b;
int ans = 0;
if(pre.find({a, b}) != pre.end()){
cout << pre[{a, b}] << endl;
continue;
}
/*cout << a << " " << b << endl;
for(int x : vect[b]){
cout << x << " ";
}
cout << endl;*/
for(int i : nodes[a]){
int l = lower_bound(all(vect[b]), tin[i]) - vect[b].begin();
int r = lower_bound(all(vect[b]), tout[i]) - vect[b].begin();
ans += r-l;
}
cout << ans << endl;
cout.flush();
}
}
/*
NEVER GIVE UP!
DOING SMTHNG IS BETTER THAN DOING NTHNG!!!
Your Guide when stuck:
- Continue keyword only after reading the whole input
- Don't use memset with testcases
- Check for corner cases(n=1, n=0)
- Check where you declare n(Be careful of declaring it globally and in main)
*/
Compilation message
regions.cpp: In function 'void usaco_problem()':
regions.cpp:33:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
33 | freopen("milkvisits.in", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:34:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
34 | freopen("milkvisits.out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp: In function 'void init()':
regions.cpp:40:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
40 | freopen("input.txt", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:42:8: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
42 | freopen("output.txt", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
15960 KB |
Output is correct |
| 2 |
Correct |
3 ms |
15960 KB |
Output is correct |
| 3 |
Correct |
5 ms |
16072 KB |
Output is correct |
| 4 |
Correct |
5 ms |
15960 KB |
Output is correct |
| 5 |
Correct |
6 ms |
15960 KB |
Output is correct |
| 6 |
Correct |
12 ms |
15960 KB |
Output is correct |
| 7 |
Correct |
16 ms |
15960 KB |
Output is correct |
| 8 |
Correct |
23 ms |
15960 KB |
Output is correct |
| 9 |
Correct |
37 ms |
16472 KB |
Output is correct |
| 10 |
Correct |
64 ms |
16472 KB |
Output is correct |
| 11 |
Correct |
81 ms |
16728 KB |
Output is correct |
| 12 |
Correct |
98 ms |
17240 KB |
Output is correct |
| 13 |
Correct |
125 ms |
16728 KB |
Output is correct |
| 14 |
Correct |
193 ms |
17240 KB |
Output is correct |
| 15 |
Correct |
181 ms |
19800 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1553 ms |
20304 KB |
Output is correct |
| 2 |
Correct |
1786 ms |
19008 KB |
Output is correct |
| 3 |
Correct |
2420 ms |
21848 KB |
Output is correct |
| 4 |
Correct |
200 ms |
16468 KB |
Output is correct |
| 5 |
Correct |
256 ms |
18264 KB |
Output is correct |
| 6 |
Correct |
2583 ms |
44040 KB |
Output is correct |
| 7 |
Correct |
2815 ms |
46416 KB |
Output is correct |
| 8 |
Correct |
4110 ms |
86352 KB |
Output is correct |
| 9 |
Correct |
1718 ms |
24824 KB |
Output is correct |
| 10 |
Runtime error |
4972 ms |
131072 KB |
Execution killed with signal 9 |
| 11 |
Correct |
4212 ms |
50104 KB |
Output is correct |
| 12 |
Correct |
4850 ms |
26964 KB |
Output is correct |
| 13 |
Correct |
4957 ms |
27220 KB |
Output is correct |
| 14 |
Execution timed out |
8023 ms |
44392 KB |
Time limit exceeded |
| 15 |
Execution timed out |
8005 ms |
32408 KB |
Time limit exceeded |
| 16 |
Correct |
6139 ms |
37960 KB |
Output is correct |
| 17 |
Execution timed out |
8034 ms |
62320 KB |
Time limit exceeded |
