Submission #624886

#	Time	Username	Problem	Language	Result	Execution time	Memory
624886		brucecccccc	Boxes with souvenirs (IOI15_boxes)	C++14	10 / 100	1 ms	312 KiB

boxes

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

using namespace std;
typedef long long ll;

ll delivery(int N, int K, int L, int p[]) {
  vector<ll> forward(N), backward(N);
  
  int i = 0;
  while (i < N && forward[i] == 0) {
    forward[i] = p[i] + min(p[i], L - p[i]);
    for (int j = i + K; j < N; j += K) {
      forward[j] = forward[j-K] + p[i] + min(p[i], L - p[i]);
    }
    i++;
  }

  i = N-1;
  while (i >= 0 && backward[i] == 0) {
    backward[i] = (L - p[i]) * 2;
    for (int j = i - K; j >= 0; j -= K) {
      backward[j] = backward[j+K] + L - p[i] + min(p[i], L - p[i]);
    }
    i--;
  }

  ll ans = min(forward[N-1], backward[0]);
  for (int i = 0; i < N - 1; i++) {
    ans = min(ans, forward[i] + backward[i+1]);
  }

  return ans;
}

Compilation message (stderr)

boxes.cpp: In function 'll delivery(int, int, int, int*)':
boxes.cpp:29:12: warning: declaration of 'i' shadows a previous local [-Wshadow]
   29 |   for (int i = 0; i < N - 1; i++) {
      |            ^
boxes.cpp:10:7: note: shadowed declaration is here
   10 |   int i = 0;
      |       ^

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