Submission #392479

#	Time	Username	Problem	Language	Result	Execution time	Memory
392479		my99n	Boxes with souvenirs (IOI15_boxes)	C++14	100 / 100	585 ms	250060 KiB

boxes

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

long long cwtour[10000100], cwwtour[10000100];
long long delivery(int N, int K, int L, int p[]) {

  for (int i = 0; i < N; i++) cwtour[i] = p[i] + (i<K? 0 : cwtour[i - K]);
  for (int i = N - 1; i >= 0; i--) cwwtour[i] = L - p[i] + (i+K>=N? 0 : cwwtour[i + K]);

  long long ans = 1e18;
  ans = min(ans, 2 * cwtour[N - 1]);
  ans = min(ans, 2 * cwwtour[0]);
  for (int i = 1; i < N; i++) ans = min(ans, 2 * cwtour[i - 1] + 2 * cwwtour[i]);
  if (K < N) {
    ans = min(ans, L + 2 * cwwtour[K]);
    ans = min(ans, L + 2 * cwtour[N - K - 1]);
    for (int i = 1; i + K < N; i++) ans = min(ans, 2 * cwtour[i - 1] + L + 2 * cwwtour[i + K]);
  } 
  if (K >= N) {
    ans = min(ans, (long long) L);
  }
  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