제출 #765840

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
765840		ono_de206	Meetings (IOI18_meetings)	C++14	19 / 100	5529 ms	40264 KiB

meetings

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

#define in insert
#define all(x) x.begin(),x.end()
#define pb push_back
#define eb emplace_back
#define ff first
#define ss second

// #define int long long
 
typedef long long ll;
typedef vector<int> vi;
typedef set<int> si;
typedef multiset<int> msi;
typedef pair<int, int> pii;
typedef vector<pii> vpii;

const int mxn = 8e5 + 10;
const long long inf = 1e18;
int h[mxn], LOG[mxn];
long long dp1[mxn], dp2[mxn];
pair<int, int> sp1[mxn][22], sp2[mxn][22];

vector<long long> minimum_costs(vector<int> H, vector<int> L, vector<int> R) {
	int Q = L.size(), n = H.size();
	vector<long long> ret(Q);

	for(int i = 1; i <= n; i++) {
		h[i] = H[i - 1];
		sp1[i][0] = {h[i], i};
		sp2[i][0] = {h[i], -i};
	}
	for(int i = 1; i <= 20; i++) {
		for(int j = 1; j + (1 << i) - 1 <= n; j++) {
			sp1[j][i] = max(sp1[j][i - 1], sp1[j + (1 << (i - 1))][i - 1]);
			sp2[j][i] = max(sp2[j][i - 1], sp2[j + (1 << (i - 1))][i - 1]);
		}
	}
	stack<pair<int, int>> s;
	for(int i = 1; i <= n; i++) {
		while(s.size() && s.top().ff <= h[i]) s.pop();
		if(s.size() == 0) dp1[i] = i * h[i];
		else dp1[i] = dp1[s.top().ss] + 1LL * h[i] * (i - s.top().ss);
		s.push({h[i], i});
	}
	while(s.size()) s.pop();
	for(int i = n; i >= 1; i--) {
		while(s.size() && s.top().ff <= h[i]) s.pop();
		if(s.size() == 0) dp2[i] = (n - i + 1) * h[i];
		else dp2[i] = dp2[s.top().ss] + 1LL * h[i] * (s.top().ss - i);
		s.push({h[i], i});	
	}
	for(int i = 2; i <= n; i++) {
		LOG[i] = LOG[i / 2] + 1;
	}

	auto get1 = [&](int l, int r) -> pair<int, int> {
		int lg = LOG[r - l + 1];
		return max(sp1[l][lg], sp1[r - (1 << lg) + 1][lg]);
	};

	auto get2 = [&](int l, int r) -> pair<int, int> {
		int lg = LOG[r - l + 1];
		return max(sp2[l][lg], sp2[r - (1 << lg) + 1][lg]);
	};

	for(int i = 0; i < Q; i++) {
		int l = L[i] + 1, r = R[i] + 1;
		ret[i] = inf;
		for(int j = l; j <= r; j++) {
			auto mx1 = get1(l, j);
			auto mx2 = get2(j, r);
			mx2.ss *= -1;
			long long tmp = dp1[j] + dp2[j] - dp1[mx1.ss] - dp2[mx2.ss] + 1LL * (mx1.ss - l + 1) * mx1.ff + 1LL * (r - mx2.ss + 1) * mx2.ff - h[j];
			ret[i] = min(ret[i], tmp);
		}
	}
	return ret;
}

• Subtask 1: 4 / 4
• Subtask 2: 15 / 15
• Subtask 3: 0 / 17
• Subtask 4: 0 / 24
• Subtask 5: 0 / 40