Submission #782710

#	Time	Username	Problem	Language	Result	Execution time	Memory
782710		Sohsoh84	Boxes with souvenirs (IOI15_boxes)	C++17	100 / 100	825 ms	212864 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
#define debug(x)	cerr << #x << ": " << x << endl;

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);	
	deque<pll> dq;
	dq.push_back({0, -1});
	for (int i = 0; i < N; i++) {
		while (dq.front().Y < i - K) dq.pop_front();

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

		while (!dq.empty() && dq.back().X >= ps[i]) dq.pop_back();
		dq.push_back({ps[i], i});
	}

	while (!dq.empty()) dq.pop_back();
	ss[N] = 0;
	dq.push_back({0, N});

	for (int i = N - 1; i >= 0; i--) {
		while (dq.front().Y > i + K) dq.pop_front();
		
		ss[i] = numeric_limits<ll>::max();
		ss[i] = min(ss[i], dq.front().X + (L - p[i]) + min(L - p[i], p[i]));
	
		while (!dq.empty() && dq.back().X >= ss[i]) dq.pop_back();
		dq.push_back({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: 30 / 30