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;
#define tol(bi) (1LL<<((int)(bi)))
typedef long long ll;
constexpr int MOD = 1e9+7;
struct SegTree{
vector<int> segtree;
SegTree(int n){
segtree.resize(tol(ceil(log2(n)+1))-1,-1);
}
void dallan(int node){
if (node*2+1<segtree.size()){
segtree[node*2+1]=max(segtree[node*2+1],segtree[node]);
segtree[node*2+2]=max(segtree[node*2+2],segtree[node]);
}
}
void update(int tarl, int tarr, int val, int l = 0, int r = -1, int node = 0){
if (r==-1) r = segtree.size()/2;
dallan(node);
if (l>=tarl && r<=tarr){
segtree[node]=max(segtree[node],val);
dallan(node);
return;
}
if (l>tarr || r<tarl) return;
int mid = l+(r-l)/2;
update(tarl, tarr, val, l, mid, node*2+1);
update(tarl, tarr, val, mid+1, r, node*2+2);
segtree[node]=min(segtree[node*2+1],segtree[node*2+2]);
}
int query(int tarl, int tarr, int l = 0, int r = -1, int node = 0){
if (r==-1) r = segtree.size()/2;
dallan(node);
if (l>=tarl && r<=tarr) return segtree[node];
if (l>tarr || r<tarl) return MOD;
int mid = l+(r-l)/2;
int lnode = query(tarl, tarr, l, mid, node*2+1);
int rnode = query(tarl, tarr, mid+1, r, node*2+2);
return min(lnode, rnode);
}
};
int main(){
int n,m,q;
cin>>n>>m>>q;
SegTree segtree(n);
vector<pair<int,int>> arr(m);
for (int i = 0; i < m; ++i)
{
cin>>arr[i].first>>arr[i].second;
}
sort(arr.begin(), arr.end(), [&](pair<int,int> a, pair<int,int> b){
return a.second<b.second;
});
int ind = 0;
vector<array<int,3>> qarr(q);
vector<bool> ansarr(q,false);
for (int i = 0; i < q; ++i)
{
cin>>qarr[i][0]>>qarr[i][1];
qarr[i][2]=i;
}
sort(qarr.begin(), qarr.end(), [&](array<int,3> a, array<int,3> b){
return a[1]<b[1];
});
for (int i = 0; i < q; ++i)
{
while (ind<m && arr[ind].second<=qarr[i][1]){
segtree.update(arr[ind].first-1,arr[ind].second-1,arr[ind].first-1);
ind++;
}
if (segtree.query(qarr[i][0]-1,qarr[i][1]-1)>=qarr[i][0]-1) ansarr[qarr[i][2]]=true;
}
for (int i = 0; i < q; ++i)
{
if (ansarr[i]) cout<<"YES"<<endl;
else cout<<"NO"<<endl;
}
}
Compilation message (stderr)
curtains.cpp: In member function 'void SegTree::dallan(int)':
curtains.cpp:12:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
12 | if (node*2+1<segtree.size()){
| ~~~~~~~~^~~~~~~~~~~~~~~
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