제출 #870861

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
870861		pcc	Discharging (NOI20_discharging)	C++14	11 / 100	77 ms	8268 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>


const ll mxn = 1e6+10;
vector<pll> v;
ll sum[mxn],dp;
deque<pll> dq;
int n;
ll total = 0;

inline ll calc(pll line,ll val){
	return line.fs*val+line.sc;
}
inline bool out(pll a,pll b,pll c){
	return (a.sc-b.sc)*(c.fs-b.fs)>=(b.sc-c.sc)*(b.fs-a.fs);
}

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++;
	}
	dq.push_back(make_pair(0ll,0ll));
	sum[0] = v[0].sc;
	for(int i = 1;i<v.size();i++){
		sum[i] = sum[i-1]+v[i].sc;
	}
	for(int i = 0;i<v.size();i++){
		pll p = v[i];
		while(dq.size()>1&&calc(dq[1],p.fs)<=calc(dq[0],p.fs))dq.pop_front();
		dp = p.fs*n+calc(dq.front(),p.fs);
		pll now = make_pair(-sum[i],dp);
		while(dq.size()>1&&out(dq.end()[-2],dq.end()[-2],now))dq.pop_back();
		dq.push_back(make_pair(-sum[i],dp));
	}
	cout<<dp;
}

컴파일 시 표준 에러 (stderr) 메시지

Discharging.cpp: In function 'int main()':
Discharging.cpp:37:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |  for(int i = 1;i<v.size();i++){
      |                ~^~~~~~~~~
Discharging.cpp:40:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |  for(int i = 0;i<v.size();i++){
      |                ~^~~~~~~~~

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