Submission #253530

#	Time	Username	Problem	Language	Result	Execution time	Memory
253530		Markoes	Potatoes and fertilizers (LMIO19_bulves)	C++14	0 / 100	3 ms	2432 KiB

bulves

#include<bits/stdc++.h>

using namespace std;
int n,a,b[500005],c[500005],id,val;
vector<pair<int,int> > va,slv;
set<int> vb;
int main(){
	ios_base::sync_with_stdio(NULL);
	cin.tie(0);cout.tie(0);
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>b[i]>>a;
		a -= min(a,b[i]);
		b[i] -= min(a,b[i]);
		if(a>0){
			va.push_back(make_pair(i,a));
		}
		if(b[i]>0){
			vb.insert(i);
		}
	}
	memset(c,0,sizeof c);
	for(auto x : va){
		id = x.first;
		val = x.second;
		
		//cout<<id<<"-id  val-"<<val<<endl;;
		while(val>0){
			auto kanan = vb.lower_bound(id);
			//cout<<*kanan<<endl;
			if(kanan == vb.begin()){
				//cout<<"depan"<<endl;
				if(b[*kanan] <= val){
					val -= b[*kanan];
					vb.erase(kanan);
					//slv.push_back(make_pair(*kanan,b[*kanan]));
					c[*kanan] += b[*kanan];
				}
				else{
					b[*kanan] -= val;
					//slv.push_back(make_pair(*kanan,val));
					c[*kanan] += val;
					val = 0;
				}
				continue;
			}
			if(kanan == vb.end()){
				//cout<<"belakang"<<endl;
				kanan--;
				if(b[*kanan] <= val){
					val -= b[*kanan];
					vb.erase(kanan);
					//slv.push_back(make_pair(*kanan,b[*kanan]));
					c[*kanan] += b[*kanan];
				}
				else{
					b[*kanan] -= val;
					//slv.push_back(make_pair(*kanan,val));
					c[*kanan] += val;
					val = 0;
				}
				continue;
			}
			auto kiri = kanan;
			kiri--;
			//cout<<*kiri<<' '<<*kanan<<endl;
			if(id - *kiri > *kanan - id){
				if(b[*kanan] <= val){
					val -= b[*kanan];
					vb.erase(kanan);
					c[*kanan] += b[*kanan];
					//slv.push_back(make_pair(*kanan,b[*kanan]));
				}
				else{
					b[*kanan] -= val;
					//slv.push_back(make_pair(*kanan,val));
					c[*kanan] += val;
					val = 0;
				}
			}
			else{
				if(b[*kiri] <= val){
					val -= b[*kiri];
					vb.erase(kiri);
					//slv.push_back(make_pair(*kiri,b[*kiri]));
					c[*kiri] += b[*kiri];
				}
				else{
					b[*kiri] -= val;
					//slv.push_back(make_pair(*kiri,val));
					c[*kiri] += val;
					val = 0;
				}
			}
		}
	}
	int v;
	long long ans=0;
	v = 1;
	for(auto x: va){
		while(c[v]<=x.second && v<n){
			ans += c[v] * 1ll * abs(v-x.first);
			x.second -= c[v];
			v++;
		}
		ans += x.second * 1ll * abs(v-x.first);
		c[v] -= x.second;
	}
	cout<<ans<<endl;
}

• Subtask 1: 0 / 24
• Subtask 2: 0 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 10
• Subtask 5: 0 / 36