Submission #468317

#	Time	Username	Problem	Language	Result	Execution time	Memory
468317		mariowong	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++14	0 / 100	124 ms	5036 KiB

sortbooks

#include <bits/stdc++.h>
using namespace std;


struct query{
	int l,r,id,val;
};
int n,m,a[100005],ans[100005],cnt,pt,seg[400005];
stack <int> s;
pair <int,int> inv[100005];
query q[100005];
bool cmp(query a1,query a2){
	if (a1.r == a2.r) return a1.id < a2.id;
	return a1.l > a2.l;
}
bool invcmp(pair<int,int> a1,pair<int,int> a2){
	if (a1.first == a2.first) return a1.second > a2.second;
	return a1.first > a2.first;
}
void update(int id,int l,int r,int pos,int v){
	if (l == r) 
	seg[id]=max(seg[id],v);
	else
	{
		int mid=(l+r)/2;
		if (pos <= mid)update(id*2,l,mid,pos,v);
		else update(id*2+1,mid+1,r,pos,v);
		seg[id]=max(seg[id*2],seg[id*2+1]);
	}
}
int getans(int id,int l,int r,int x,int y){
	if (x <= l && r <= y)
	return seg[id];
	if (x > r || y < l)
	return -1;
	int mid=(l+r)/2;
	return max(getans(id*2,l,mid,x,y),getans(id*2+1,mid+1,r,x,y));
}
int main(){
	ios::sync_with_stdio(false);
	cin >> n >> m;
	for (int i=1;i<=n;i++){
		cin >> a[i];
		while (!s.empty() && a[i] >= s.top()) s.pop();
		if (!s.empty()) inv[++cnt]=make_pair(s.top(),i);
		s.push(i);
	}
	for (int i=1;i<=m;i++){
		cin >> q[i].l >> q[i].r >> q[i].val;
		q[i].id=i;
	}
	sort(inv+1,inv+1+cnt);
	reverse(inv+1,inv+1+cnt); sort(q+1,q+1+m,cmp);
	for (int i=1;i<=m;i++){
		while (pt < cnt && inv[pt+1].first >= q[i].l) {
			pt++;
			update(1,1,n,inv[pt].second,a[inv[pt].first]+a[inv[pt].second]);
		}
		if (getans(1,1,n,q[i].l,q[i].r) <= q[i].val) ans[q[i].id]=1;
	}
	for (int i=1;i<=m;i++){
		cout << ans[i] << "\n";
	}
	return 0;
}	

• Subtask 1: 0 / 8
• Subtask 2: 0 / 9
• Subtask 3: 0 / 13
• Subtask 4: 0 / 17
• Subtask 5: 0 / 30
• Subtask 6: 0 / 23