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;
const int N=5e5+5;
const int K=1<<20;
const int INF=INT_MAX/2;
int n,m,q;
vector<int> upd[N];
vector<pair<int,int>> qrs[N];
bool ans[N];
struct SegTree{
int t[K],lz[K];
void apply(int i,int v){
t[i]=max(t[i],v);
lz[i]=max(lz[i],v);
}
void push(int i){
apply(i*2,lz[i]);
apply(i*2+1,lz[i]);
lz[i]=0;
}
void update(int l,int r,int i,int x,int y,int v){
if(y<l||r<x)return;
if(x<=l&&r<=y)return apply(i,v);
push(i);
int m=(l+r)/2;
update(l,m,i*2,x,y,v);
update(m+1,r,i*2+1,x,y,v);
t[i]=min(t[i*2],t[i*2+1]);
}
void update(int x,int y,int v){
update(1,n,1,x,y,v);
}
int query(int l,int r,int i,int x,int y){
if(y<l||r<x)return INF;
if(x<=l&&r<=y)return t[i];
push(i);
int m=(l+r)/2;
return min(query(l,m,i*2,x,y),query(m+1,r,i*2+1,x,y));
}
int query(int x,int y){
return query(1,n,1,x,y);
}
}seg;
int main(){
cin.tie(nullptr)->sync_with_stdio(false);
cin >> n >> m >> q;
for(int i=0;i<m;i++){
int l,r;
cin >> l >> r;
upd[r].emplace_back(l);
}
for(int i=0;i<q;i++){
int l,r;
cin >> l >> r;
qrs[r].emplace_back(l,i);
}
for(int r=1;r<=n;r++){
for(auto l:upd[r]){
seg.update(l,r,l);
}
for(auto [l,i]:qrs[r]){
ans[i]=(seg.query(l,r)>=l);
}
}
for(int i=0;i<q;i++){
cout << (ans[i]?"YES":"NO") << "\n";
}
}
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