/**
* Author: Anil Byar
**/
#include <bits/stdc++.h>
// #include <ext/pb_ds/assoc_container.hpp>
// #include <ext/pb_ds/tree_policy.hpp>
// using namespace __gnu_pbds;
using namespace std;
// template<class T>
// using ordered_set = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(x) (int)(x).size()
#define uniq(v) v.erase(unique(all(v)), v.end())
#define ft first
#define sd second
#define pb push_back
#define eb emplace_back
// Source: https://codeforces.com/blog/entry/68809
// { start
void __print(int x) {cerr << x;}
void __print(long x) {cerr << x;}
void __print(long long x) {cerr << x;}
void __print(unsigned x) {cerr << x;}
void __print(unsigned long x) {cerr << x;}
void __print(unsigned long long x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '"' << x << '"';}
void __print(const string &x) {cerr << '"' << x << '"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifndef ONLINE_JUDGE
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
#define debug(x...)
#endif
// } end
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<pii> vii;
typedef vector<ll> vl;
typedef vector<pll> vll;
typedef vector<vi> vvi;
typedef vector<vii> vvii;
typedef vector<vl> vvl;
#define dbg if(0)
const ll MOD = 1e9+7;
const ll MOD9 = 998244353;
const ll INFLL = 1e18+5;
const int INF = 1e9;
void printbit(int x, int len) {string s="\n";while(len--){s=((x%2)?'1':'0')+s;x/=2;} cout<<s;}
ll power(ll x, ll y, ll mod){if (y==0) return 1;ll ret = power(x, y/2, mod);ret *= ret;ret%=mod;if (y&1) ret *= x;return ret%mod;}
ll modinv(ll x, ll mod = MOD) {return power(x, mod-2, mod);}
template<class T> bool chmin(T& a, T b){return (a>b?a=b,1:0);}
template<class T> bool chmax(T& a, T b){return (a<b?a=b,1:0);}
template<class T>
istream& operator>>(istream&in, vector<T>&v){
for (T& x:v) in>>x;
return in;
}
template<class T>
ostream& operator<<(ostream&out, vector<T>&v){
for (T& x:v) out<<x<<' ';
cout<<'\n';
return out;
}
// use ?: with brackets (?:)
// check for overflow
// think about dp
// Read the statement carefully
const int N = 2e5+1, R = 25000;
const int B = 450;
vvi adj, emp, tour;
vi reg, idofreg, currcnt, st, en;
vvl cntans;
vector<int> anc;
int timer;
void dfs(int node){
st[node] = timer++;
tour[reg[node]].push_back(st[node]);
int id = idofreg[reg[node]];
if (id && (currcnt[id]++)==0) anc.push_back(id);
for (int x:adj[node]){
for (int y:anc) cntans[y][reg[x]] += static_cast<ll>currcnt[y];
dfs(x);
}
if (id && (--currcnt[id])==0) anc.pop_back();
en[node] = timer++;
}
void solve(){
timer = 0;
int n, r, q;cin>>n>>r>>q;
adj.resize(n);
emp.resize(r);
tour.resize(r);
reg.resize(n);
idofreg.resize(r);
currcnt.resize(r);
st.resize(n);
en.resize(n);
{
int x;cin>>x;
x--;
emp[x].push_back(0);
reg[0] = x;
}
for (int i = 1;i<n;i++){
int p, x;cin>>p>>x;
x--;p--;
reg[i] = x;
emp[x].push_back(i);
adj[p].push_back(i);
}
int rg = 0;
for (int i = 0;i<r;i++){
if (sz(emp[i])>=B) idofreg[i] = ++rg;
}
cntans.resize(rg+1, vl(r, 0));
assert(rg<=B);
dfs(0);
while(q--){
int r1, r2;cin>>r1>>r2;
r1--;
r2--;
if (idofreg[r1]) cout<<cntans[idofreg[r1]][r2];
else {
ll ans = 0;
for (int e:emp[r1]){
ans += lower_bound(all(tour[r2]), en[e]) - upper_bound(all(tour[r2]), st[e]);
}
cout<<ans;
}
cout<<endl;
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
#define ONLINE_JUDGE
#ifndef ONLINE_JUDGE
freopen("input.in", "r", stdin);
freopen("output.out", "w", stdout);
freopen("debug.dbg", "w", stderr);
int tt = clock();
#endif
int t=1, i = 1;
// cin>>t;
while(t--){
// cout<<"Case #"<<i++<<": ";
solve();
cout<<'\n';
}
#ifndef ONLINE_JUDGE
cerr << "TIME = " << (float)(clock() - tt)/CLOCKS_PER_SEC << endl;
tt = clock();
#endif
}
Compilation message
regions.cpp: In function 'void dfs(int)':
regions.cpp:113:61: error: expected '(' before 'currcnt'
113 | for (int y:anc) cntans[y][reg[x]] += static_cast<ll>currcnt[y];
| ^~~~~~~
| (
regions.cpp:113:71: error: expected ')' before ';' token
113 | for (int y:anc) cntans[y][reg[x]] += static_cast<ll>currcnt[y];
| ^
| )
regions.cpp: In function 'int main()':
regions.cpp:182:14: warning: unused variable 'i' [-Wunused-variable]
182 | int t=1, i = 1;
| ^
