Submission #782699

#	Time	Username	Problem	Language	Result	Execution time	Memory
782699		Sohsoh84	Boxes with souvenirs (IOI15_boxes)	C++17	70 / 100	2058 ms	213244 KiB

boxes

#include "boxes.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;

#define X		first
#define Y		second

const ll MAXN = 2e7 + 10;
ll ps[MAXN], ss[MAXN];

long long delivery(int N, int K, int L, int p[]) {
	sort(p, p + N);	
	priority_queue<pll, vector<pll>, greater<pll>> pq;
	pq.push({0, -1});
	for (int i = 0; i < N; i++) {
		while (pq.top().Y < i - K) pq.pop();

		ps[i] = numeric_limits<ll>::max();
		ps[i] = min(ps[i], pq.top().X + p[i] + min(L - p[i], p[i]));

		pq.push({ps[i], i});
	}

	while (!pq.empty()) pq.pop();
	ss[N] = 0;
	pq.push({0, N});

	for (int i = N - 1; i >= 0; i--) {
		while (pq.top().Y > i + K) pq.pop();
		ss[i] = numeric_limits<ll>::max();
		ss[i] = min(ss[i], pq.top().X + (L - p[i]) + min(L - p[i], p[i]));
		
		pq.push({ss[i], i});
	}

	ll ans = min(ps[N - 1], ss[0]);
	for (int i = 0; i < N; i++)
		ans = min(ans, ps[i] + ss[i + 1]);

	return ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 0 / 30