Submission #1219196

#TimeUsernameProblemLanguageResultExecution timeMemory
1219196boclobanchatHedgehog Daniyar and Algorithms (IZhO19_sortbooks)C++20
0 / 100
3095 ms124032 KiB
#include<bits/stdc++.h>
using namespace std;
struct query { int l,r,k,pos; };
const int MAXN=1e6+69;
int A[MAXN],pref[MAXN],fl[MAXN],fr[MAXN];
bool ans[MAXN];
vector<query> vc[MAXN];
void dnc(int l,int r,vector<query> vq)
{
	if(l==r)
	{
		for(auto v:vq) ans[v.pos]=true;
		return ;
	}
	int mid=(l+r)/2;
	vector<query> va,vb;
	for(auto v:vq) if(v.r<=mid) va.push_back(v);
	else if(mid<v.l) vb.push_back(v);
	else vc[v.r].push_back(v);
	dnc(l,mid,va);
	dnc(mid+1,r,vb);
	pref[mid+1]=fl[mid+1]=fr[mid]=0;
	set<int> st;
	for(int i=mid;i>=l;i--)
	{
		auto res=st.lower_bound(A[i]);
		if(res==st.begin()) fl[i]=fl[i+1];
		else fl[i]=max(fl[i+1],(*prev(res))+A[i]);
		pref[i]=max(pref[i+1],A[i]),st.insert(A[i]);
	}
	st.clear();
	int mx=0;
	for(int i=mid+1;i<=r;i++)
	{
		fr[i]=fr[i-1];
		if(mx>A[i]) fr[i]=max(fr[i],mx+A[i]);
		mx=max(mx,A[i]),st.insert(A[i]);
		for(auto v:vc[i])
		{
			bool ck=(fl[v.l]<=v.k&&fr[v.r]<=v.k);
			auto res=st.lower_bound(pref[v.l]);
			if(res!=st.begin()&&pref[v.l]+(*prev(res))>v.k) ck=false;
			ans[v.pos]=ck;
		}
	}
}
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int n,q;
    cin>>n>>q;
    for(int i=1;i<=n;i++) cin>>A[i];
    vector<query> vq;
    for(int i=1;i<=q;i++)
    {
		int l,r,k;
		cin>>l>>r>>k;
		vq.push_back({l,r,k,i});
	}
	dnc(1,n,vq);
	for(int i=1;i<=q;i++) cout<<ans[i]<<"\n";
}
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