Submission #115504

#	Time	Username	Problem	Language	Result	Execution time	Memory
115504		E869120	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	590 ms	205444 KiB

boxes

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

long long cl[10000009], cr[10000009];

long long delivery(int N, int K, int L, int p[]) {
	for (int i = 0; i < N; i++) {
		cl[i] = min(1LL * L, 2LL * p[i]);
		if (i >= K) cl[i] += cl[i - K];
	}
	for (int i = N - 1; i >= 0; i--) {
		cr[i] = min(1LL * L, 2LL * (L - p[i]));
		if (i + K < N) cr[i] += cr[i + K];
	}
	long long minx = (1LL << 60);
	for (int i = -1; i < N; i++) {
		long long sum = 0;
		if (i >= 0) sum += cl[i];
		if (i + 1 < N) sum += cr[i + 1];
		minx = min(minx, sum);
	}
	return minx;
}

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