//#pragma GCC optimize("O3,unroll-loops,Ofast") //#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt") #include <bits/stdc++.h> // #include <ext/pb_ds/assoc_container.hpp> // #include <ext/pb_ds/tree_policy.hpp> using namespace std; // using namespace __gnu_pbds; #define MAX 200005 #define pb push_back // #define mp make_pair #define int long long // #define double long double #define f first #define s second #define vi vector<int> #define pii pair<int,int> #define si set<int> #define vpii vector<pair<int,int>> const int mod = 1e9+7; const int INF = 1e18; // myMap.begin()->first : key // myMap.begin()->second : value int epow(int a,int b){int ans=1;while(b){if(b&1) ans*=a;a*=a;b>>=1;ans%=mod;a%=mod;}return ans%mod;} int gcd(int a,int b) {if(a<b)swap(a,b);while(b){int tmp=b;b=a%b;a=tmp;}return a;} int mul(int a,int b){return ((a%mod)*(b%mod))%mod;} int sum(int a,int b){return ((a%mod)+(b%mod))%mod;} //typedef tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>ordered_set; // typedef // tree<int,null_type,less_equal<int>,rb_tree_tag,tree_order_statistics_node_update>ordered_multiset; vi dsu(MAX),sz(MAX); int find(int a){ if(dsu[a]==a) return a; return dsu[a]=find(dsu[a]); } void unite(int a,int b){ a=find(a); b=find(b); if(a==b) return; if(sz[a]<sz[b]) swap(a,b); sz[a]+=sz[b]; dsu[b]=a; } vi segt(MAX*4),lazy(MAX*4); void push(int v,int tl,int tr){ if(!lazy[v]) return; segt[v]+=lazy[v]; if(tl!=tr){ lazy[v*2]+=lazy[v]; lazy[v*2+1]+=lazy[v]; } lazy[v]=0; } void update(int v,int tl,int tr,int l,int r,int val){ push(v,tl,tr); if(tl>r || tr<l || l>r) return; if(tl>=l && tr<=r){ lazy[v]+=val; push(v,tl,tr); return; } int mid=(tl+tr)>>1; update(v*2,tl,mid,l,r,val); update(v*2+1,mid+1,tr,l,r,val); segt[v]=segt[v*2]+segt[v*2+1]; } int query(int v,int tl,int tr,int l,int r){ push(v,tl,tr); if(tl>r || tr<l || l>r) return 0; if(tl>=l && tr<=r) return segt[v]; int mid=(tl+tr)>>1; return query(v*2,tl,mid,l,r)+query(v*2+1,mid+1,tr,l,r); } vi euler[MAX]; int tin[MAX],tout[MAX],timer=1,p[MAX][22],dep[MAX],type[MAX]; vi adj[MAX]; void dfs(int node,int par){ tin[node]=timer++; dep[node]=dep[par]+1; p[node][0]=par; for(int i=1;i<=20;i++) p[node][i]=p[p[node][i-1]][i-1]; euler[type[node]].pb(tin[node]); for(auto u : adj[node]){ if(u!=par) dfs(u,node); } tout[node]=timer-1; } int find_lca(int a,int b){ if(dep[a]<dep[b]) swap(a,b); int fark=dep[a]-dep[b]; for(int i=20;i>=0;i--){ if(fark&(1<<i)) a=p[a][i]; } if(a==b) return a; for(int i=20;i>=0;i--){ if(p[a][i]!=p[b][i]) a=p[a][i],b=p[b][i]; } return p[a][0]; } int up(int node,int x){ for(int i=20;i>=0;i--){ if(x&(1<<i)) node=p[node][i]; } return node; } set<array<int,3>> calc; set<int> st[MAX]; void dfs2(int node,int par){ for(auto u : adj[node]){ if(u==par) continue; dfs2(u,node); if(st[u].size()>st[node].size()) swap(st[node],st[u]); for(auto x : st[u]) st[node].insert(x); } for(auto u : st[node]){ int l=lower_bound(euler[u].begin(),euler[u].end(),tin[node]+1)-euler[u].begin(); int r=upper_bound(euler[u].begin(),euler[u].end(),tout[node])-euler[u].begin(); array<int,3> a={type[node],u,u}; auto itr = lower_bound(calc.begin(),calc.end(),a); if(itr==calc.end() || (*itr)[0]!=type[node] || (*itr)[1]!=u) calc.insert({type[node],u,r-l}); else{ int newval=(*itr)[2]+r-l; calc.erase(itr); calc.insert({{type[node],u,newval}}); } } st[node].insert(type[node]); } void solve(){ int n,r,q; cin>>n>>r>>q; cin>>type[1]; for(int i=2;i<=n;i++){ int p,tur; cin>>p>>tur; adj[p].pb(i); adj[i].pb(p); type[i]=tur; } dfs(1,0); dfs2(1,0); // for(auto u : calc) cout<<u[0]<<" "<<u[1]<<" "<<u[2]<<endl; while(q--){ int a,b; cin>>a>>b; array<int,3> c={a,b,-1}; auto itr = lower_bound(calc.begin(),calc.end(),c); if(itr==calc.end() || (*itr)[0]!=a || (*itr)[1]!=b) cout<<"0"<<endl; else cout<<(*itr)[2]<<endl; } } int32_t main(/*int32_t argc, char* argv[]*/){ std::ios_base::sync_with_stdio(0); std::cin.tie(0); // freopen("promote.in", "r", stdin); // freopen("promote.out", "w", stdout); int t=1; // cin >> t; while (t--) solve(); return 0; }