This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MX=1e5+5;
int N,M,Q;
vector<int> qry[MX];
ll S[MX], T[MX], X[MX], Y[MX], ans[MX];
int L[MX], R[MX];
struct fenwick {
ll t[MX];
void upd(int p, ll v) {
for(int i=p;i<=N;i+=i&-i) t[i]+=v;
}
ll que(int p) {
ll res=0;
for(int i=p;i>0;i-=i&-i) res+=t[i];
return res;
}
ll que(int l, int r) {
return que(r)-que(l-1);
}
void reset() {
for(int i=0;i<MX;i++) t[i]=0;
}
} ft, tt;
int main() {
cin.tie(0); ios_base::sync_with_stdio(0);
cin>>N>>M>>Q;
for(int i=0;i<N-1;i++) {
int u,v;
cin>>u>>v;
}
vector<pair<int,int>> e;
e.push_back({0,0});
for(int i=0;i<M;i++) {
int p,c;
cin>>p>>c;
e.push_back({c,p});
}
sort(e.begin(),e.end());
for(int i=0;i<Q;i++) {
cin>>S[i]>>T[i]>>X[i]>>Y[i];
if(S[i]>T[i]) swap(S[i],T[i]);
L[i]=0,R[i]=M;
int m=(L[i]+R[i])/2;
qry[m].push_back(i);
}
for(int ii=0;ii<20;ii++) {
ft.reset();
tt.reset();
// activate
for(int i=1;i<=M;i++) {
auto [c,p]=e[i];
ft.upd(p,1);
}
vector<pair<int,int>> nxt;
for(int i=0;i<=M;i++) {
auto [c,p]=e[i];
if(i>0) {
ft.upd(p,-1);
tt.upd(p,c);
}
for(auto id:qry[i]) {
ll s=tt.que(S[id],T[id]-1);
if(s<=Y[id]) {
ans[id]=ft.que(S[id],T[id]-1);
L[id]=i+1;
if(L[id]<=R[id])
nxt.push_back({(L[id]+R[id])/2, id});
} else {
R[id]=i-1;
if(L[id]<=R[id])
nxt.push_back({(L[id]+R[id])/2, id});
}
}
}
for(int i=0;i<=M;i++) qry[i].clear();
for(auto [i,id]:nxt) qry[i].push_back(id);
}
for(int i=0;i<Q;i++) {
if(ans[i]>X[i]) {
cout<<-1<<'\n';
} else {
cout<<X[i]-ans[i]<<'\n';
}
}
}
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