// __builtin_popcount(x) broj bitova
// __builtin_popcountll(x) long long
#define here cerr<<"---------------------------\n"
#include "bits/stdc++.h"
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#define ld double
#define ll long long
#define ull unsigned long long
#define llinf 100000000000000000LL // 10^17
#define iinf 2000000000 // 2*10^9
#define pb push_back
#define popb pop_back
#define fi first
#define sc second
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pld pair<ld,ld>
#define sz(a) int(a.size())
#define all(a) a.begin(),a.end()
#define rall(a) a.begin(),a.end(),greater<int>()
#define getunique(v) {sort(all(v)); v.erase(unique(all(v)), v.end());}
using namespace std;
using namespace __gnu_pbds;
typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
void setIO(string inoutname)
{
freopen((inoutname+".in").c_str(),"r",stdin);
freopen((inoutname+".out").c_str(),"w",stdout);
}
#define mod 1
ll gcd(ll a, ll b)
{
if(b==0) return a;
if(a==0) return b;
if(a>=b) return gcd(a%b,b);
return gcd(a,b%a);
}
ll lcm(ll a,ll b){
return (a/gcd(a,b))*b;
}
ll add(ll a,ll b){
a+=b;
a+=mod;
if(a>=mod) a%=mod;
return a;
}
ll mul(ll a,ll b){return(a*b)%mod;}
#define maxn 200005
ll n,r,q;
ll a[maxn];
ll b[maxn];
ll in[maxn],out[maxn];
ll cnt[maxn];
vector<ll> g[maxn];
ll ti = 1;
void dfs(ll u){
in[u] = ti;
b[ti] = a[u];
ti++;
for(ll v : g[u]){
dfs(v);
}
out[u] = ti-1;
}
bool in_t(ll v,ll u){
return in[u]<=in[v]&&out[u]>=out[v];
}
bool cmp(ll x,ll y){return in[x]<in[y];}
map<pll,ll> pre;
vector<ll> w[maxn];
vector<ll> wt[maxn];
vector<pll> f;
ll bsr(ll x,ll i){
ll l = 0,r = sz(wt[x])-1,mid,rez = -1;
while(l<=r){
mid = (l+r)/2;
if(i>=wt[x][mid]){
rez = mid;
l = mid+1;
}else r = mid-1;
}
return rez;
}
ll bsl(ll x,ll i){
ll l = 0,r = sz(wt[x])-1,mid,rez = -1;
while(l<=r){
mid = (l+r)/2;
if(i<=wt[x][mid]){
rez = mid;
r = mid-1;
}else l = mid+1;;
}
return rez;
}
void tc(){
ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);
cin >> n >> r >> q;
cin >> a[1];
w[a[1]].pb(1);
for(ll i = 2;i<=n;i++){
ll x;
cin >> x >> a[i];
w[a[i]].pb(i);
g[x].pb(i);
}
dfs(1);
for(ll i = 1;i<=r;i++){
for(ll j : w[i]){
wt[i].pb(in[j]);
}
sort(all(wt[i]));
}
ll siz = 1;
for(ll i = 1;i*i<=n;i++) siz = i;
for(ll i = 1;i<=r;i++){
if(sz(w[i])<siz) continue;
fill(cnt,cnt+n+2,0);
for(ll j : w[i]){
cnt[in[j]]++;
cnt[out[j]+1]--;
}
for(ll j = 1;j<ti;j++){
cnt[j]+=cnt[j-1];
pre[{i,b[j]}]+=cnt[j];
}
}
/*here;
for(ll j = 1;j<=r;j++){
for(ll i : wt[j]) cerr<<i<< " ";
cerr<<endl;
}
here;*/
while(q--){
ll r1,r2;
cin >> r1 >> r2;
if(r1>=c) cout<<pre[{r1,r2}]<<endl;
else{
ll ans = 0;
//cerr<<"R2: "<<r2<<endl;
for(ll i : w[r1]){
ll l = in[i],r = out[i];
ll br = bsr(r2,r);
ll bl = bsl(r2,l);
//cerr<<"AAA"<<endl;
//cerr<<l<< " "<<r<<endl;
//cerr<<bl<< " "<<br<<endl;
if(bl==-1) continue;
if(br==-1) continue;
if(bl>br) continue;
//cerr<<bl<< " "<<br<<" "<<br-bl<<endl;
ans+=br-bl+1;
}
cout<<ans<<endl;
}
}
}
int main(){
ios_base::sync_with_stdio(false);cerr.tie(0);cout.tie(0);cin.tie(0);
//setIO("lol");
int t; t = 1;
while(t--){
tc();
}
return 0;
}
Compilation message
regions.cpp: In function 'void tc()':
regions.cpp:140:16: error: 'c' was not declared in this scope; did you mean 'tc'?
140 | if(r1>=c) cout<<pre[{r1,r2}]<<endl;
| ^
| tc
regions.cpp: In function 'void setIO(std::string)':
regions.cpp:31:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
31 | freopen((inoutname+".in").c_str(),"r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
regions.cpp:32:13: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
32 | freopen((inoutname+".out").c_str(),"w",stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
