Submission #893307

#	Time	Username	Problem	Language	Result	Execution time	Memory
893307		amirhoseinfar1385	별자리 3 (JOI20_constellation3)	C++17	0 / 100	2 ms	6492 KiB

constellation3

#include<bits/stdc++.h>
using namespace std;
const int maxn=200000+10;
struct node{
	int x,y,w,l,r;
}allq[maxn];
int all[maxn],q,n;
vector<int>sn,si;
pair<long long,long long>val[maxn],fakeval[maxn];
bool cmpn(int a,int b){
	return allq[a].y<allq[b].y;
}

bool cmpi(int a,int b){
	return all[a]<all[b];
}

void callr()
{
	for(int i=1;i<=q;i++){
		int l=allq[i].x,r=allq[i].x;
		while(l!=0&&all[l]<allq[i].y){
			l--;
		}
		while(r!=n+1&&all[r]<allq[i].y){
			r++;
		}
		allq[i].l=l;
		allq[i].r=r;
	}
}
long long mainres=0;

void updn(int ind){
	long long res=0,resa=0;
	for(int i=allq[ind].x;i<allq[ind].r;i++){
		res=max(res,val[i].second);
	}
	for(int i=allq[ind].x;i>allq[ind].l;i--){
		resa=max(resa,val[i].first);
	}
	res+=resa+allq[ind].w;
	fakeval[allq[ind].r].first=max(fakeval[allq[ind].r].first,res);
	fakeval[allq[ind].l].second=max(fakeval[allq[ind].l].second,res);
//	cout<<ind<<" "<<allq[ind].l<<" "<<allq[ind].r<<" "<<res<<"\n";
	mainres=max(mainres,res);
}

void upd(int ind){
	val[ind]=fakeval[ind];
//	cout<<ind<<" "<<val[ind].first<<" "<<val[ind].second<<"\n";
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>all[i];
		si.push_back(i);
	}
	cin>>q;
	long long suma=0;
	for(int i=1;i<=q;i++){
		sn.push_back(i);
		cin>>allq[i].x>>allq[i].y>>allq[i].w;
		suma+=allq[i].w;
	}
	callr();
	sort(sn.begin(),sn.end(),cmpn);
	sort(si.begin(),si.end(),cmpi);
	int i=0,j=0;
	while(i<(int)sn.size()&&j<(int)si.size()){
		if(allq[sn[i]].y<=all[si[j]]){
			updn(sn[i]);
			i++;
		}
		else{
			upd(si[j]);
			j++;
		}
	}
	while(i<(int)sn.size()){
		updn(sn[i]);
		i++;
	}
	while(j<(int)si.size()){
		upd(si[j]);
		j++;
	}
	int now=(int)si.size()-1;
	long long res=val[si[now]].second;
	while(now!=0&&all[si[now-1]]==all[si[now]]){
		now--;
		res+=val[si[now]].second;
	}
	res+=val[si[now]].first;
	mainres=max(mainres,res);
	mainres=suma-mainres;
	cout<<mainres<<"\n";
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 21
• Subtask 3: 0 / 65