Submission #870857

#	Time	Username	Problem	Language	Result	Execution time	Memory
870857		pcc	Discharging (NOI20_discharging)	C++14	20 / 100	79 ms	500 KiB

Discharging

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

#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>


vector<pll> v;
vector<pll> st;
int n;
ll total = 0;
ll sum = 0;

inline bool check(pll a,pll b){
	ll ta = a.fs*(sum-b.sc)+b.fs*sum;
	ll tb = a.fs*sum;
	if(ta>tb)return true;
	else return false;
}

int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>n;
	for(int i = 0;i<n;i++){
		int k;
		cin>>k;
		if(v.empty()||v.back().fs < k)v.push_back({k,1});
		else v.back().sc++;
	}
	reverse(v.begin(),v.end());
	for(auto &i:v){
		sum += i.sc;
		while(!st.empty()&&check(st.back(),i)){
			total -= st.back().fs*(sum-i.sc);
			i.sc += st.back().sc;
			i.fs = st.back().fs;
			st.pop_back();
		}
		total += sum*i.fs;
		st.push_back(i);
	}
	//for(auto &i:st)cout<<i.fs<<' '<<i.sc<<endl;
	cout<<total;
}

• Subtask 1: 9 / 9
• Subtask 2: 0 / 13
• Subtask 3: 0 / 25
• Subtask 4: 11 / 11
• Subtask 5: 0 / 14
• Subtask 6: 0 / 28