Submission #163604

#	Time	Username	Problem	Language	Result	Execution time	Memory
163604		shenxy	Boxes with souvenirs (IOI15_boxes)	C++11	100 / 100	932 ms	217368 KiB

boxes

#include "boxes.h"
#include <algorithm>
#include <deque>
#include <utility>
using namespace std;
typedef pair<long long, int> ii;
long long delivery(int N, int K, int L, int p[]) {
	deque<ii> dp1, dp2;
	long long dptable[N];
	dp1.push_back(ii(0, -1));
	dp2.push_back(ii(2 * (L - p[0]), -1));
	for (int i = 0; i < N; ++i) {
		while (!dp1.empty() && dp1.front().second + K < i) dp1.pop_front();
		while (!dp2.empty() && dp2.front().second + K < i) dp2.pop_front();
		if (i >= K) dptable[i] = L + dptable[i - K];
		else dptable[i] = L;
		if (!dp1.empty()) dptable[i] = min(dptable[i], dp1.front().first + 2 * p[i]);
		if (!dp2.empty()) dptable[i] = min(dptable[i], dp2.front().first);
		if (i != N - 1) {
			while (!dp1.empty() && dp1.back().first >= dptable[i]) dp1.pop_back();
			dp1.push_back(ii(dptable[i], i));
			while (!dp2.empty() && dp2.back().first >= dptable[i] + 2 * (L - p[i + 1])) dp2.pop_back();
			dp2.push_back(ii(dptable[i] + 2 * (L - p[i + 1]), i));
		}
	}
	return dptable[N - 1];
}

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