Submission #412122

#	Time	Username	Problem	Language	Result	Execution time	Memory
412122		Mlxa	Meetings (IOI18_meetings)	C++14	0 / 100	5550 ms	7400 KiB

meetings

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(x) x.begin(), x.end()
#define mp make_pair
#define mt make_tuple
#define x first
#define y second
#include "meetings.h"

const int XN  = 1e6;
const int INF = 0x3f3f3f3f;

int s[XN], v[XN], p;
ll sum;
ll pref[XN], suff[XN];

vector<ll> minimum_costs(vector<int> h, vector<int> l, vector<int> r) {
	int q = (int)l.size();
	vector<ll> c(q);
	for (int it = 0; it < q; ++it) {
		sum = 0;
		p = 0;
		v[p] = INF;
		s[p++] = l[it] - 1;
		for (int i = l[it]; i <= r[it]; ++i) {
			while (v[p - 1] < h[i]) {
				--p;
				assert(p);
				sum -= v[p] * (s[p] - s[p - 1]);
			}
			v[p] = h[i];
			s[p] = i;
			sum += v[p] * (s[p] - s[p - 1]);
			++p;
			pref[i] = sum;
		}
		sum = 0;
		p = 0;
		v[p] = INF;
		s[p++] = r[it] + 1;
		for (int i = r[it]; i >= l[it]; --i) {
			while (v[p - 1] < h[i]) {
				--p;
				assert(p);
				sum -= v[p] * (s[p - 1] - s[p]);
			}
			v[p] = h[i];
			s[p] = i;
			sum += v[p] * (s[p - 1] - s[p]);
			++p;
			suff[i] = sum - h[i];
		}
		c[it] = pref[l[it]] + suff[l[it]];
		for (int i = l[it]; i <= r[it]; ++i) {
			// cout << pref[i] + suff[i] << endl;
			c[it] = min(c[it], pref[i] + suff[i]);
		}
	}
	return c;
}

#ifdef LC
#include "grader.cpp"
#endif

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